JPH09298057A - Lithium ion battery - Google Patents
Lithium ion batteryInfo
- Publication number
- JPH09298057A JPH09298057A JP8109097A JP10909796A JPH09298057A JP H09298057 A JPH09298057 A JP H09298057A JP 8109097 A JP8109097 A JP 8109097A JP 10909796 A JP10909796 A JP 10909796A JP H09298057 A JPH09298057 A JP H09298057A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- active material
- electrode active
- electrolyte
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims description 17
- 229910001416 lithium ion Inorganic materials 0.000 title claims description 17
- 239000003792 electrolyte Substances 0.000 claims abstract description 48
- 239000007773 negative electrode material Substances 0.000 claims abstract description 46
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 239000008151 electrolyte solution Substances 0.000 claims description 30
- 239000003575 carbonaceous material Substances 0.000 claims description 10
- 239000011255 nonaqueous electrolyte Substances 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 239000011149 active material Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011889 copper foil Substances 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 38
- 230000000694 effects Effects 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リチウムイオンを
吸蔵、放出可能な炭素材料から成る負極活物質層が箔状
の芯体の両面に設けられた負極と、リチウム含有複合酸
化物から成る正極と、前記負極と正極との間に配置され
たセパレータと、有機非水電解液とを備えたリチウムイ
オン電池に関し、特に上記負極活物質層には黒鉛が用い
られているリチウムイオン電池に関する。TECHNICAL FIELD The present invention relates to a negative electrode in which a negative electrode active material layer made of a carbon material capable of absorbing and releasing lithium ions is provided on both sides of a foil-shaped core, and a positive electrode made of a lithium-containing composite oxide. And a separator arranged between the negative electrode and the positive electrode, and an organic non-aqueous electrolyte, and more particularly to a lithium ion battery in which graphite is used for the negative electrode active material layer.
【０００２】[0002]
【従来の技術】近年、上記の構造を有するリチウムイオ
ン電池は、高容量化が可能な電池として注目されてい
る。ここで、かかる電池の負極作製時には、箔状の芯体
の両面にスラリー状の負極活物質を塗布、乾燥した後、
ローラにより負極活物質層を圧縮するような方法が用い
られている。このように負極活物質層を圧縮すれば、箔
状の芯体に炭素材料が固着されて炭素材料の脱落を防止
しうると共に、より多くの活物質が電池内に装填される
ことになって、一層の高容量化が可能となる。2. Description of the Related Art In recent years, lithium-ion batteries having the above structure have been attracting attention as batteries capable of increasing their capacity. Here, at the time of producing the negative electrode of such a battery, after applying the slurry-like negative electrode active material to both surfaces of the foil-shaped core and drying,
A method of compressing the negative electrode active material layer with a roller is used. By compressing the negative electrode active material layer in this manner, the carbon material can be fixed to the foil-shaped core to prevent the carbon material from falling off, and more active material can be loaded into the battery. It is possible to further increase the capacity.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
如く負極活物質層（特に、負極活物質に黒鉛を用いた負
極活物質層）を圧縮すると、当該圧縮によって黒鉛結晶
が箔状の芯体の表面に平行に配向するため、負極の表面
が光沢を有する程に平滑になる。このため、当該負極を
用いて電池を作製すると、負極とセパレータとが密着し
た状態となって、負極の電解液浸透方向における中央部
分には電解液が含浸されないことが多発する。この結
果、電池の容量が小さくなり、しかもサイクル特性に劣
るという課題を有していた。However, when the negative electrode active material layer (particularly, the negative electrode active material layer using graphite as the negative electrode active material) is compressed as described above, the compression causes the graphite crystals to form a foil-shaped core body. Since it is oriented parallel to the surface, the surface of the negative electrode is so smooth that it has gloss. Therefore, when a battery is manufactured using the negative electrode, the negative electrode and the separator often come into close contact with each other, and the central portion in the electrolytic solution permeating direction of the negative electrode is often not impregnated with the electrolytic solution. As a result, there is a problem that the capacity of the battery becomes small and the cycle characteristics are poor.
【０００４】本発明は上記従来の課題を考慮してなされ
たものであって、負極の電解液浸透方向における中央部
分にも十分に電解液を含浸させることにより、電池の高
容量化とサイクル特性の向上とを図り得るリチウムイオ
ン電池を提供することを目的としている。The present invention has been made in consideration of the above-mentioned conventional problems, and by fully impregnating the central portion of the negative electrode in the electrolyte permeation direction with the electrolytic solution, the capacity of the battery is increased and the cycle characteristics are improved. It is an object of the present invention to provide a lithium ion battery capable of improving the battery.
【０００５】[0005]
【課題を解決するための手段】前述した目的を達成する
ために、本発明のうちで請求項１記載の発明は、リチウ
ムイオンを吸蔵、放出可能な炭素材料から成る負極活物
質層が箔状の芯体の両面に設けられた負極と、リチウム
含有複合酸化物から成る正極と、前記負極と正極との間
に配置されたセパレータと、有機非水電解液とを備えた
リチウムイオン電池において、前記負極活物質層の表面
には、前記有機非水電解液の浸透方向に電解液案内溝が
形成されていることを特徴とする。In order to achieve the above-mentioned object, in the invention according to claim 1 of the present invention, the negative electrode active material layer made of a carbon material capable of absorbing and desorbing lithium ions has a foil shape. In a lithium ion battery comprising a negative electrode provided on both surfaces of the core body, a positive electrode made of a lithium-containing composite oxide, a separator arranged between the negative electrode and the positive electrode, and an organic non-aqueous electrolyte solution, An electrolytic solution guide groove is formed on a surface of the negative electrode active material layer in a permeating direction of the organic non-aqueous electrolytic solution.
【０００６】上記構成であれば、電解液案内溝が形成さ
れている部分では、負極とセパレータとが密着した状態
とならないので、負極の電解液浸透方向における中央部
分にも電解液案内溝を介して電解液が含浸されることに
なる。したがって、負極の表面全体に電解液が浸透する
ので、電池の容量の低下やサイクル特性の低下といった
不都合が生じるのを回避することができる。With the above structure, the negative electrode and the separator are not brought into close contact with each other in the portion where the electrolytic solution guide groove is formed, so that the electrolytic solution guide groove is also provided in the central portion of the negative electrode in the electrolytic solution permeating direction. As a result, the electrolytic solution is impregnated. Therefore, since the electrolytic solution permeates the entire surface of the negative electrode, it is possible to avoid inconveniences such as a decrease in battery capacity and a decrease in cycle characteristics.
【０００７】また請求項２記載の発明は、請求項１記載
の発明の構成のうち、炭素材料として黒鉛を用いること
を特徴とする。炭素材料として黒鉛を用いれば、負極の
表面が特に平滑になり易いので、上記作用、効果が一層
発揮されることになる。The invention according to claim 2 is characterized in that, in the constitution of the invention according to claim 1, graphite is used as the carbon material. If graphite is used as the carbon material, the surface of the negative electrode tends to be particularly smooth, so that the above-described actions and effects are further exhibited.
【０００８】また請求項３記載の発明は、請求項１又は
請求項２記載の発明の構成において、負極活物質層の表
面における有機非水電解液の浸透方向の一端から他端に
かけて電解液案内溝が形成されていることを特徴とす
る。このような構成であれば、上記作用、効果が一層円
滑に発揮されることになる。According to a third aspect of the present invention, in the structure of the first or second aspect of the invention, the electrolyte is guided from one end to the other end in the permeation direction of the organic non-aqueous electrolyte on the surface of the negative electrode active material layer. It is characterized in that a groove is formed. With such a configuration, the above-described actions and effects can be more smoothly exhibited.
【０００９】また請求項４記載の発明は、請求項１又は
請求項２記載の発明の構成において、電解液案内溝の本
数を極板１ｃｍにつき１〜５本に、電解液案内溝の深さ
を負極活物質層の厚みの１／８以上１／２以下に、電解
液案内溝の幅を０．１ｍｍ以上１ｍｍ以下に、それぞれ
規制したことを特徴とする。このように電解液案内溝の
本数と電解液案内溝の深さと電解液案内溝の幅とを規制
すれば、上記作用、効果が一層に発揮されることにな
る。これは、以下に示す理由によるものと考えられる。According to a fourth aspect of the present invention, in the structure of the first or second aspect of the invention, the number of the electrolyte guide grooves is set to 1 to 5 per 1 cm of the electrode plate, and the depth of the electrolyte guide grooves is set. Is regulated to 1/8 or more and 1/2 or less of the thickness of the negative electrode active material layer, and the width of the electrolyte solution guiding groove is regulated to 0.1 mm or more and 1 mm or less. By thus regulating the number of electrolyte solution guide grooves, the depth of the electrolyte solution guide grooves, and the width of the electrolyte solution guide grooves, the above-described actions and effects can be further exerted. This is considered to be due to the following reason.
【００１０】即ち、電解液案内溝の本数が極板１ｃｍに
つき１本未満、電解液案内溝の深さが負極活物質層の厚
みの１／８未満或いは電解液案内溝の幅が０．１ｍｍ未
満であれば、負極の表面積が余り増大しない（即ち、電
解液案内溝がその作用を十分に発揮し得ない）ので、本
発明の効果を十分に発揮することができない。一方、電
解液案内溝の本数が極板１ｃｍにつき５本を超え、電解
液案内溝の深さが負極活物質層の厚みの１／２を超え、
又は電解液案内溝の幅が１ｍｍを超えると、負極表面の
凹凸が大きくなるため、極板反応が不均一となって、電
池特性が低下するという理由によるものである。That is, the number of electrolyte guide grooves is less than 1 per 1 cm of the electrode plate, the depth of the electrolyte guide grooves is less than 1/8 of the thickness of the negative electrode active material layer, or the width of the electrolyte guide grooves is 0.1 mm. When it is less than the above range, the surface area of the negative electrode does not increase so much (that is, the electrolyte guide groove cannot sufficiently exert its function), and therefore the effect of the present invention cannot be sufficiently exerted. On the other hand, the number of electrolyte guide grooves exceeds 5 per 1 cm of the electrode plate, and the depth of electrolyte guide grooves exceeds 1/2 of the thickness of the negative electrode active material layer,
Alternatively, if the width of the electrolyte guide groove exceeds 1 mm, the unevenness of the surface of the negative electrode becomes large, so that the reaction of the electrode plate becomes non-uniform and the battery characteristics deteriorate.
【００１１】また請求項５記載の発明は、請求項１記載
の発明の構成において、表面に突起が形成されたローラ
で活物質層を圧縮することにより電解液案内溝を形成す
ることを特徴とする。表面に電解液案内溝を形成する方
法としては、カッター等で切り込みを形成するような方
法も考えられるが、この方法では負極活物質を削ること
になるので、負極容量が低下するという問題がある。こ
れに対して、上記の如く表面に突起が形成されたローラ
で負極活物質層を圧縮する方法にて電解液案内溝を形成
すれば、負極活物質を削ることにならないので、負極容
量が低下するという問題が生じない。加えて、ローラの
突起により電解液案内溝を形成すると、当該部分では極
めて大きな圧力で押圧されることになるので、芯体内に
炭素材料が埋め込まれるという効果（即ち、アンカー効
果）が十分に発揮され、炭素材料が負極から脱落するの
を一層抑制できる効果もある。According to a fifth aspect of the invention, in the structure of the first aspect of the invention, the electrolyte guide groove is formed by compressing the active material layer with a roller having protrusions formed on the surface thereof. To do. A method of forming a notch with a cutter or the like is also conceivable as a method of forming the electrolyte guide groove on the surface, but since this method scrapes the negative electrode active material, there is a problem that the negative electrode capacity decreases. . On the other hand, if the electrolytic solution guide groove is formed by the method of compressing the negative electrode active material layer with the roller having the protrusions formed on the surface as described above, the negative electrode active material is not scraped, and the negative electrode capacity is reduced. There is no problem of doing. In addition, when the electrolyte guide groove is formed by the protrusion of the roller, the portion is pressed with an extremely large pressure, so that the effect of embedding the carbon material in the core body (that is, the anchor effect) is sufficiently exerted. Therefore, there is also an effect that the carbon material can be further prevented from falling off from the negative electrode.
【００１２】[0012]
【発明の実施の形態】本発明の実施の形態を、図１〜図
４に基づいて、以下に説明する。図１は本発明のリチウ
ムイオン電池を模式的に示す断面図であり、図１の本発
明電池は、ＬｉＣｏＯ2 から成る正極１、黒鉛を主体と
する負極２、これら両電極を離間するセパレータ３、正
極リード４、負極リード５、正極外部端子６、負極缶７
などからなる。正極１及び負極２は、セパレータ３を介
して渦巻き状に巻き取られた状態で、負極缶７内に収容
されており、次いで、負極缶７内に電解液が注液されて
おり、正極１は正極リード４を介して正極外部端子６
に、また負極２は負極リード５を介して負極缶７に接続
され、電池内部で生じた化学エネルギーを電気エネルギ
ーとして外部へ取り出し得るようになっている。尚、上
記電解液としては、エチレンカーボネートとジエチルカ
ーボネートとの混合溶媒に、溶質としてのＬｉＰＦ6 を
１モル／リットルの割合で溶解したものを用いた。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view schematically showing the lithium-ion battery of the present invention. The battery of the present invention shown in FIG. 1 includes a positive electrode 1 made of LiCoO 2 , a negative electrode 2 mainly composed of graphite, and a separator 3 separating these two electrodes. , Positive electrode lead 4, negative electrode lead 5, positive electrode external terminal 6, negative electrode can 7
Etc. The positive electrode 1 and the negative electrode 2 are accommodated in the negative electrode can 7 while being wound in a spiral shape via the separator 3, and then the electrolytic solution is poured into the negative electrode can 7. Is a positive electrode external terminal 6 via a positive electrode lead 4.
Further, the negative electrode 2 is connected to the negative electrode can 7 through the negative electrode lead 5 so that the chemical energy generated inside the battery can be taken out as electric energy to the outside. The electrolytic solution used was a solution of LiPF 6 as a solute dissolved in a mixed solvent of ethylene carbonate and diethyl carbonate at a rate of 1 mol / liter.
【００１３】ここで、上記負極２の構造を、図２〜図４
に基づいて説明する。図２は巻回前の負極を示す正面
図、図３は図２のＡ部を拡大した拡大正面図、図４は図
３のＢ−Ｂ線矢視断面図である。図４に示すように、銅
箔から成る芯体１０の両面には黒鉛から成る負極活物質
層１１・１１が形成されており、これら負極活物質層１
１・１１の外面には、１ｃｍにつき１〜５本となるよう
な間隔で電解液案内溝１２…が形成されている。上記電
解液案内溝１２…の深さｔ1 は負極活物質層１１の厚み
ｔ2 の１／８以上１／２以下となるように構成され、ま
た、図３に示すように、電解液案内溝の幅ｔ3 は０．１
ｍｍ以上１ｍｍ以下となるように構成されている。尚、
図２に示すように、負極２の一端には、負極リード５が
固定されている。Here, the structure of the negative electrode 2 is shown in FIGS.
It will be described based on. 2 is a front view showing the negative electrode before winding, FIG. 3 is an enlarged front view showing an enlarged portion A of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB of FIG. As shown in FIG. 4, negative electrode active material layers 11 made of graphite are formed on both surfaces of a core body 10 made of copper foil.
Electrolyte guide grooves 12 ... Are formed on the outer surface of 1 · 11 at intervals of 1 to 5 per cm. The depth t 1 of the electrolyte guide grooves 12 is configured to be 1/8 or more and 1/2 or less of the thickness t 2 of the negative electrode active material layer 11, and as shown in FIG. The groove width t 3 is 0.1
It is configured to be not less than mm and not more than 1 mm. still,
As shown in FIG. 2, a negative electrode lead 5 is fixed to one end of the negative electrode 2.
【００１４】このような負極２は、銅箔から成る芯体１
０の両面にスラリー状の負極活物質を塗布、乾燥して負
極活物質層を作製した後、表面に突起が形成されたロー
ラで上記負極活物質層を圧縮することにより作製され
る。Such a negative electrode 2 is a core body 1 made of copper foil.
A negative electrode active material in a slurry form is applied to both surfaces of No. 0 and dried to prepare a negative electrode active material layer, and then the negative electrode active material layer is compressed with a roller having protrusions formed on the surface.
【００１５】ここで、上記実施の態様では、電解液案内
溝１２…は、電解液浸透方向における一端から他端にか
けて形成されているが、このような構造に限定するもの
ではなく、図５に示すように、電解液の浸透し難い極板
中央部にのみ電解液案内溝１２…を形成するような構造
であっても良い。また、本発明は円筒型電池に限定され
るものではなく、ボタン型電池等如何なる形状のリチウ
ムイオン電池にも適用しうることは勿論である。Here, in the above embodiment, the electrolytic solution guide grooves 12 ... Are formed from one end to the other end in the electrolytic solution permeating direction, but the present invention is not limited to such a structure, and FIG. As shown, the structure may be such that the electrolytic solution guide groove 12 ... Is formed only in the central portion of the electrode plate where the electrolytic solution hardly penetrates. Further, the present invention is not limited to the cylindrical battery, and it goes without saying that the present invention can be applied to a lithium ion battery of any shape such as a button battery.
【００１６】[0016]
【実施例】本発明の一実施例を、図６〜図１０に基づい
て、以下に説明する。尚、第１実施例では極板１ｃｍあ
たりの電解液案内溝の最適な本数を、第２実施例では電
解液案内溝の幅の最適値を、第３実施例では電解液案内
溝の深さの最適値を各々調べた。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the first embodiment, the optimum number of electrolyte guide grooves per 1 cm of the electrode plate, in the second embodiment, the optimum width of the electrolyte guide grooves, and in the third embodiment, the depth of the electrolyte guide grooves. The optimum value of was investigated.
【００１７】（第１実施例） （実施例１）電解液案内溝の本数を極板１ｃｍあたり
０．１本とし、負極活物質層の厚さｔ 2 に対する電解液
案内溝の深さｔ1 の割合を１／２とし、電解液案内溝の
幅ｔ3を０．１ｍｍとした他は、前記発明の実施の態様
と同様の電池を作製した。このようにして作製した電池
を、以下本発明電池Ａ１と称する。(First Embodiment) (First Embodiment) The number of electrolyte guide grooves is set to 1 cm per electrode plate.
0.1 and the thickness t of the negative electrode active material layer TwoElectrolyte against
Guide groove depth t1Of the electrolytic solution guide groove
Width tThreeExcept that the distance is set to 0.1 mm.
A battery similar to the above was manufactured. Batteries produced in this way
Will be hereinafter referred to as Battery A1 of the invention.
【００１８】（実施例２〜５）電解液案内溝の本数を極
板１ｃｍあたり、各０．８本、１本、３本、５本とする
他は、上記実施例１と同様の電池を作製した。このよう
にして作製した電池を、以下各々本発明電池Ａ２〜Ａ５
と称する。(Examples 2 to 5) A battery similar to that of Example 1 was prepared, except that the number of electrolyte guide grooves was 0.8, 1, 3, and 5 per cm of the electrode plate. It was made. The batteries thus produced are referred to below as batteries A2 to A5 of the invention, respectively.
Called.
【００１９】（比較例）図６及び図７に示すように、電
解液案内溝を形成しない他は、上記実施例１と同様の電
池を作製した。尚、図６及び図７では、同一の部材につ
いては図２及び図４と同一の番号を付している。このよ
うにして作製した電池を、以下比較電池Ｘと称する。(Comparative Example) As shown in FIGS. 6 and 7, a battery similar to that of Example 1 was prepared except that the electrolyte guide groove was not formed. In FIGS. 6 and 7, the same members are designated by the same reference numerals as those in FIGS. 2 and 4. The battery fabricated in this manner is hereinafter referred to as Comparative Battery X.
【００２０】（実験１）上記本発明電池Ａ１〜Ａ５にお
いて、比較電池Ｘの初期容量に対する容量比、及び、比
較電池Ｘの芯体と負極活物質層との密着度に対する密着
度比を調べたので、それらの結果を下記表１に示す。
尚、表１においては比較電池Ｘの初期容量を１００と
し、また比較電池Ｘの芯体と負極活物質層との密着度を
１００として表している。(Experiment 1) In the batteries A1 to A5 of the present invention, the capacity ratio of the comparative battery X to the initial capacity and the adhesion ratio of the comparative battery X to the adhesion between the core and the negative electrode active material layer were examined. Therefore, the results are shown in Table 1 below.
In Table 1, the initial capacity of the comparative battery X is 100, and the degree of adhesion between the core of the comparative battery X and the negative electrode active material layer is 100.
【００２１】[0021]
【表１】 [Table 1]
【００２２】上記表１から明らかなように、本発明電池
Ａ１〜Ａ５では比較電池Ｘと比べて、容量比及び密着度
比が同等かそれ以上であることが認められ、特に電解液
案内溝の本数が極板１ｃｍあたり１本〜５本の本発明電
池Ａ３〜Ａ５では容量比及び密着度比が非常に高くなっ
ていることが認められる。したがって、容量比及び密着
度比の点からは、電解液案内溝の本数は極板１ｃｍあた
り１本〜５本であることが望ましい。As is clear from Table 1 above, in the batteries A1 to A5 of the present invention, it was recognized that the capacity ratio and the adhesion ratio were equal to or more than those of the comparative battery X, and particularly in the electrolyte guide groove. It is recognized that the capacity ratio and the adhesion ratio are extremely high in the present batteries A3 to A5 in which the number of the batteries is 1 to 5 per 1 cm of the electrode plate. Therefore, from the viewpoint of the capacity ratio and the adhesion ratio, it is desirable that the number of the electrolyte guide grooves is 1 to 5 per 1 cm of the electrode plate.
【００２３】（実験２）上記本発明電池Ａ１〜Ａ５及び
比較電池Ｘにおけるサイクル特性を調べたので、その結
果を図８に示す。尚、実験条件は、電流１Ｃで電池電圧
が４．１０Ｖに達するまで充電した後、４．１０Ｖの定
電圧充電で満充電とし、更に電流１Ｃで放電終止電圧３
Ｖまで放電するという条件である。(Experiment 2) The cycle characteristics of the batteries A1 to A5 of the present invention and the comparative battery X were examined, and the results are shown in FIG. The experimental conditions were that the battery was charged at a current of 1 C until the battery voltage reached 4.10 V, and then the battery was fully charged by a constant voltage of 4.10 V, and the discharge end voltage was 3 at a current of 1 C.
The condition is to discharge to V.
【００２４】図８から明らかなように、本発明電池Ａ１
〜Ａ５は比較電池Ｘに比べてサイクル特性が向上してい
ることが認められ、特に、本発明電池Ａ３〜Ａ５はサイ
クル特性が極めて向上していることが認められる。した
がって、サイクル特性の点からは、電解液案内溝の本数
は極板１ｃｍあたり１本〜５本であることが望ましい。As is apparent from FIG. 8, the present invention battery A1
It is recognized that the batteries Nos. To A5 have improved cycle characteristics as compared with the comparative battery X, and in particular, the batteries A3 to A5 of the present invention have extremely improved cycle characteristics. Therefore, from the viewpoint of cycle characteristics, it is desirable that the number of the electrolyte guide grooves is 1 to 5 per 1 cm of the electrode plate.
【００２５】（第２実施例） （実施例１）電解液案内溝の本数を極板１ｃｍあたり３
本とし、負極活物質層の厚さｔ2 に対する電解液案内溝
の深さｔ1 の割合を１／２とし、電解液案内溝の幅ｔ3
を０．０７ｍｍとした他は、前記発明の実施の態様と同
様の電池を作製した。このようにして作製した電池を、
以下本発明電池Ｂ１と称する。(Second Embodiment) (First Embodiment) The number of electrolyte guide grooves is set to 3 per cm of the electrode plate.
The ratio of the depth t 1 of the electrolyte guide groove to the thickness t 2 of the negative electrode active material layer is 1/2, and the width t 3 of the electrolyte guide groove is
Batteries similar to those of the above-described embodiment of the present invention were manufactured except that the thickness was 0.07 mm. The battery fabricated in this way is
Hereinafter, this invention battery B1 is called.
【００２６】（実施例２〜５）電解液案内溝の幅ｔ
3 を、各０．１ｍｍ、０．５ｍｍ、１ｍｍ、１．３ｍｍ
とする他は、上記実施例１と同様の電池を作製した。こ
のようにして作製した電池を、以下各々本発明電池Ｂ２
〜Ｂ５と称する。(Examples 2 to 5) Width t of electrolyte guide groove
3 for 0.1mm, 0.5mm, 1mm, 1.3mm
A battery similar to that in Example 1 was manufactured except for the above. The batteries thus produced are hereinafter referred to as Battery B2 of the invention.
~ B5.
【００２７】（比較例）比較例としては、前記第１実施
例の比較例に示す比較電池Ｘを用いた。(Comparative Example) As a comparative example, the comparative battery X shown in the comparative example of the first embodiment was used.
【００２８】（実験１）上記本発明電池Ｂ１〜Ｂ５にお
いて、比較電池Ｘの初期容量に対する容量比、及び、比
較電池Ｘの芯体と負極活物質層との密着度に対する密着
度比を調べたので、それらの結果を下記表２に示す。
尚、表２においては比較電池Ｘの初期容量を１００と
し、また比較電池Ｘの芯体と負極活物質層との密着度を
１００として表している。(Experiment 1) In the batteries B1 to B5 of the present invention, the capacity ratio to the initial capacity of the comparative battery X and the adhesion ratio to the adhesion between the core of the comparative battery X and the negative electrode active material layer were examined. Therefore, the results are shown in Table 2 below.
In Table 2, the initial capacity of the comparative battery X is 100, and the degree of adhesion between the core body of the comparative battery X and the negative electrode active material layer is 100.
【００２９】[0029]
【表２】 [Table 2]
【００３０】上記表２から明らかなように、本発明電池
Ｂ１〜Ｂ５では比較電池Ｘと比べて、容量比及び密着度
比が同等かそれ以上であることが認められ（但し、本発
明電池Ｂ５では容量比が若干比較電池Ｘより小さくなっ
ている）、特に電解液案内溝の幅ｔ3 が０．１〜１ｍｍ
の本発明電池Ｂ２〜Ｂ４では容量比及び密着度比が非常
に高くなっていることが認められる。したがって、容量
比及び密着度比の点からは、電解液案内溝の幅ｔ3 は
０．１〜１ｍｍであることが望ましい。As is clear from Table 2 above, in the batteries B1 to B5 of the present invention, it was recognized that the capacity ratio and the adhesion ratio were equal to or higher than those of the comparative battery X (provided that the batteries B5 of the present invention were the same. The capacity ratio is slightly smaller than that of the comparative battery X), especially when the width t 3 of the electrolyte guide groove is 0.1 to 1 mm.
It is recognized that the batteries B2 to B4 of the present invention have extremely high capacity ratio and adhesion ratio. Therefore, from the viewpoint of the capacity ratio and the adhesion ratio, the width t 3 of the electrolyte guide groove is preferably 0.1 to 1 mm.
【００３１】（実験２）上記本発明電池Ｂ１〜Ｂ５及び
比較電池Ｘにおけるサイクル特性を調べたので、その結
果を図９に示す。尚、実験条件は、前記第１実施例の実
験２と同様の条件である。(Experiment 2) The cycle characteristics of the batteries B1 to B5 of the present invention and the comparative battery X were examined. The results are shown in FIG. The experimental conditions are the same as those in Experiment 2 of the first embodiment.
【００３２】図９から明らかなように、本発明電池Ｂ１
〜Ｂ５は比較電池Ｘに比べてサイクル特性が向上してい
ることが認められ、特に、本発明電池Ｂ２〜Ｂ４はサイ
クル特性が極めて向上していることが認められる。した
がって、サイクル特性の点からは、電解液案内溝の幅ｔ
3 は０．１〜１ｍｍであることが望ましい。As is apparent from FIG. 9, the battery B1 of the present invention
It is recognized that the cycle characteristics of the batteries B1 to B5 are improved as compared with the comparative battery X, and that the batteries B2 to B4 of the present invention have extremely improved cycle characteristics. Therefore, in terms of cycle characteristics, the width t of the electrolyte guide groove is
3 is preferably 0.1 to 1 mm.
【００３３】（第３実施例） （実施例１）電解液案内溝の本数を極板１ｃｍあたり３
本とし、負極活物質層の厚さｔ2 に対する電解液案内溝
の深さｔ1 の割合を２／３とし、電解液案内溝の幅ｔ3
を０．５ｍｍとした他は、前記発明の実施の態様と同様
の電池を作製した。このようにして作製した電池を、以
下本発明電池Ｃ１と称する。(Third Embodiment) (Embodiment 1) The number of electrolyte guide grooves is set to 3 per cm of the electrode plate.
The ratio of the depth t 1 of the electrolytic solution guide groove to the thickness t 2 of the negative electrode active material layer is set to 2/3, and the width t 3 of the electrolytic solution guide groove is set.
Batteries similar to those of the above-described embodiment of the present invention were manufactured except that the thickness was set to 0.5 mm. The battery thus produced is hereinafter referred to as Battery C1 of the invention.
【００３４】（実施例２〜５）負極活物質層の厚さｔ2
に対する電解液案内溝の深さｔ1 の割合を、各１／２、
１／３、１／８、１／１０とする他は、上記実施例１と
同様の電池を作製した。このようにして作製した電池
を、以下各々本発明電池Ｃ２〜Ｃ５と称する。(Examples 2 to 5) Thickness t 2 of the negative electrode active material layer
The ratio of the depth t 1 of the electrolyte guide groove to
Batteries similar to those of Example 1 were manufactured except that the battery was 1/3, 1/8, or 1/10. The batteries manufactured in this manner are hereinafter referred to as the present batteries C2 to C5, respectively.
【００３５】（比較例）比較例としては、前記第１実施
例の比較例に示す比較電池Ｘを用いた。Comparative Example As a comparative example, the comparative battery X shown in the comparative example of the first embodiment was used.
【００３６】（実験１）上記本発明電池Ｃ１〜Ｃ５にお
いて、比較電池Ｘの初期容量に対する容量比、及び、比
較電池Ｘの芯体と負極活物質層との密着度に対する密着
度比を調べたので、それらの結果を下記表３に示す。
尚、表３においては比較電池Ｘの初期容量を１００と
し、また比較電池Ｘの芯体と負極活物質層との密着度を
１００として表している。(Experiment 1) In the batteries C1 to C5 of the present invention, the capacity ratio to the initial capacity of the comparative battery X and the adhesion ratio to the adhesion between the core of the comparative battery X and the negative electrode active material layer were examined. Therefore, those results are shown in Table 3 below.
In Table 3, the initial capacity of the comparative battery X is 100, and the degree of adhesion between the core of the comparative battery X and the negative electrode active material layer is 100.
【００３７】[0037]
【表３】 [Table 3]
【００３８】上記表３から明らかなように、本発明電池
Ｃ１〜Ｃ５では比較電池Ｘと比べて、容量比及び密着度
比が同等かそれ以上であることが認められ（但し、本発
明電池Ｃ１では容量比が若干比較電池Ｘより小さくなっ
ている）、特に負極活物質層の厚さｔ2 に対する電解液
案内溝の深さｔ1 の割合が１／８〜１／２の本発明電池
Ｃ２〜Ｃ４では容量比及び密着度比が非常に高くなって
いることが認められる。したがって、容量比及び密着度
比の点からは、負極活物質層の厚さｔ2 に対する電解液
案内溝の深さｔ1 の割合は１／８〜１／２であることが
望ましい。As is clear from Table 3, the batteries C1 to C5 of the present invention were found to have the same or higher capacity ratio and adhesion ratio as compared to the comparative battery X (provided that the battery C1 of the present invention was used. The capacity ratio is slightly smaller than that of the comparative battery X), especially the battery C2 of the present invention in which the ratio of the depth t 1 of the electrolyte guide groove to the thickness t 2 of the negative electrode active material layer is 1/8 to 1/2. It is recognized that the capacity ratio and the adhesion ratio are very high in the range of to C4. Therefore, from the viewpoint of the capacity ratio and the adhesion ratio, the ratio of the depth t 1 of the electrolyte guide groove to the thickness t 2 of the negative electrode active material layer is preferably 1/8 to 1/2.
【００３９】（実験２）上記本発明電池Ｃ１〜Ｃ５及び
比較電池Ｘにおけるサイクル特性を調べたので、その結
果を図１０に示す。尚、実験条件は、前記第１実施例の
実験２と同様の条件である。(Experiment 2) The cycle characteristics of the batteries C1 to C5 of the present invention and the comparative battery X were examined, and the results are shown in FIG. The experimental conditions are the same as those in Experiment 2 of the first embodiment.
【００４０】図１０から明らかなように、本発明電池Ｃ
１〜Ｃ５は比較電池Ｘに比べてサイクル特性が向上して
いることが認められ、特に、本発明電池Ｃ２〜Ｃ４はサ
イクル特性が極めて向上していることが認められる。し
たがって、サイクル特性の点からは、負極活物質層の厚
さｔ2 に対する電解液案内溝の深さｔ1 の割合は１／８
〜１／２であることが望ましい。As is apparent from FIG. 10, the battery C of the present invention
It is recognized that the cycle characteristics of the batteries 1 to C5 are improved as compared with the comparative battery X, and particularly, the cycle characteristics of the batteries C2 to C4 of the present invention are significantly improved. Therefore, in terms of cycle characteristics, the ratio of the depth t 1 of the electrolyte guide groove to the thickness t 2 of the negative electrode active material layer is 1/8.
It is desirable that it is ½.
【００４１】[0041]
【発明の効果】以上説明したように本発明によれば、負
極の電解液浸透方向における中央部分にも電解液案内溝
を介して電解液が含浸されることになるので、電池容量
が増大すると共にサイクル特性の向上を図ることができ
るという優れた効果を奏する。As described above, according to the present invention, the electrolytic solution is impregnated into the central portion of the negative electrode in the electrolytic solution permeating direction through the electrolytic solution guide groove, so that the battery capacity is increased. At the same time, there is an excellent effect that the cycle characteristics can be improved.
【図１】本発明のリチウムイオン電池を模式的に示す断
面図である。FIG. 1 is a sectional view schematically showing a lithium-ion battery of the present invention.
【図２】巻回前の負極の正面図である。FIG. 2 is a front view of a negative electrode before winding.
【図３】図２のＡ部を拡大した拡大正面図である。FIG. 3 is an enlarged front view showing an enlarged portion A of FIG.
【図４】図３のＢ−Ｂ線矢視断面図である。4 is a sectional view taken along the line BB of FIG.
【図５】巻回前の負極の変形例を示す正面図である。FIG. 5 is a front view showing a modified example of the negative electrode before winding.
【図６】比較例における巻回前の負極の正面図である。FIG. 6 is a front view of a negative electrode before winding in a comparative example.
【図７】比較例における巻回前の負極の断面図である。FIG. 7 is a cross-sectional view of a negative electrode before winding in a comparative example.
【図８】本発明電池Ａ１〜Ａ５及び比較電池Ｘにおける
サイクル特性を示すグラフである。FIG. 8 is a graph showing cycle characteristics of the present batteries A1 to A5 and the comparative battery X.
【図９】本発明電池Ｂ１〜Ｂ５及び比較電池Ｘにおける
サイクル特性を示すグラフである。FIG. 9 is a graph showing cycle characteristics of the present batteries B1 to B5 and the comparative battery X.
【図１０】本発明電池Ｃ１〜Ｃ５及び比較電池Ｘにおけ
るサイクル特性を示すグラフである。FIG. 10 is a graph showing cycle characteristics of the present batteries C1 to C5 and the comparative battery X.
１：正極 ２：負極 ３：セパレータ １０：芯体 １１：負極活物質層 １２：電解液案内溝 1: Positive electrode 2: Negative electrode 3: Separator 10: Core body 11: Negative electrode active material layer 12: Electrolyte guide groove
Claims (5)
材料から成る負極活物質層が箔状の芯体の両面に設けら
れた負極と、リチウム含有複合酸化物から成る正極と、
前記負極と正極との間に配置されたセパレータと、有機
非水電解液とを備えたリチウムイオン電池において、 前記負極活物質層の表面には、前記有機非水電解液の浸
透方向に電解液案内溝が形成されていることを特徴とす
るリチウムイオン電池。1. A negative electrode in which a negative electrode active material layer made of a carbon material capable of absorbing and releasing lithium ions is provided on both sides of a foil-shaped core, and a positive electrode made of a lithium-containing composite oxide.
In a lithium ion battery comprising a separator arranged between the negative electrode and the positive electrode, and an organic non-aqueous electrolyte solution, the surface of the negative electrode active material layer, an electrolyte solution in the permeation direction of the organic non-aqueous electrolyte solution. A lithium ion battery having a guide groove formed therein.
特徴とする請求項１記載のリチウムイオン電池。2. The lithium ion battery according to claim 1, wherein graphite is used as the carbon material.
表面における前記有機非水電解液の浸透方向の一端から
他端にかけて形成されていることを特徴とする請求項１
又は請求項２記載のリチウムイオン電池。3. The electrolytic solution guide groove is formed from one end to the other end in the permeation direction of the organic non-aqueous electrolytic solution on the surface of the negative electrode active material layer.
Alternatively, the lithium ion battery according to claim 2.
き１〜５本であり、電解液案内溝の深さは負極活物質層
の厚みの１／８以上１／２以下であり、電解液案内溝の
幅は０．１ｍｍ以上１ｍｍ以下であることを特徴とする
請求項１又は請求項２記載のリチウムイオン電池。4. The number of the electrolyte guide grooves is 1 to 5 per 1 cm of the electrode plate, and the depth of the electrolyte guide grooves is 1/8 or more and 1/2 or less of the thickness of the negative electrode active material layer. The width of the electrolyte guide groove is 0.1 mm or more and 1 mm or less, and the lithium ion battery according to claim 1 or 2.
れたローラで前記活物質層を圧縮することにより形成さ
れることを特徴とする請求項１記載のリチウムイオン電
池。5. The lithium ion battery according to claim 1, wherein the electrolyte guide groove is formed by compressing the active material layer with a roller having a protrusion formed on the surface thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8109097A JPH09298057A (en) | 1996-04-30 | 1996-04-30 | Lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8109097A JPH09298057A (en) | 1996-04-30 | 1996-04-30 | Lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09298057A true JPH09298057A (en) | 1997-11-18 |
Family
ID=14501515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8109097A Pending JPH09298057A (en) | 1996-04-30 | 1996-04-30 | Lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09298057A (en) |
Cited By (40)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998048466A1 (en) * | 1997-04-23 | 1998-10-29 | Japan Storage Battery Co., Ltd. | Electrode and battery |
| JPH1186870A (en) * | 1997-09-03 | 1999-03-30 | Japan Storage Battery Co Ltd | Electrochemical battery |
| JPH11154508A (en) * | 1997-11-19 | 1999-06-08 | Toshiba Corp | Non-aqueous electrolyte battery |
| JP2000182603A (en) * | 1998-12-17 | 2000-06-30 | Matsushita Electric Ind Co Ltd | Non-aqueous electrolyte secondary battery |
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-
1996
- 1996-04-30 JP JP8109097A patent/JPH09298057A/en active Pending
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| WO1998048466A1 (en) * | 1997-04-23 | 1998-10-29 | Japan Storage Battery Co., Ltd. | Electrode and battery |
| JPH1186870A (en) * | 1997-09-03 | 1999-03-30 | Japan Storage Battery Co Ltd | Electrochemical battery |
| JPH11154508A (en) * | 1997-11-19 | 1999-06-08 | Toshiba Corp | Non-aqueous electrolyte battery |
| JP2000182603A (en) * | 1998-12-17 | 2000-06-30 | Matsushita Electric Ind Co Ltd | Non-aqueous electrolyte secondary battery |
| JP2000195525A (en) * | 1998-12-28 | 2000-07-14 | Sanyo Electric Co Ltd | Nonaqueous electrolyte battery |
| DE10024844B4 (en) * | 1999-05-19 | 2005-05-04 | Nec Tokin Corp., Sendai | Secondary battery with non-aqueous electrolyte |
| US6444357B1 (en) | 1999-05-19 | 2002-09-03 | Nec Tokin Corporation | Non-aqueous electrolyte secondary battery |
| JP2001035484A (en) * | 1999-05-19 | 2001-02-09 | Nec Corp | Nonaqueous electrolyte secondary battery |
| JP2001176558A (en) * | 1999-12-20 | 2001-06-29 | Toshiba Corp | Non-aqueous electrolyte secondary battery |
| JP2006100280A (en) * | 2000-10-20 | 2006-04-13 | Massachusetts Inst Of Technol <Mit> | Reticulated, controlled porosity battery structure |
| KR20030047040A (en) * | 2001-12-07 | 2003-06-18 | 삼성에스디아이 주식회사 | Lithium battery |
| JP2003197265A (en) * | 2001-12-27 | 2003-07-11 | Sanyo Electric Co Ltd | Nonaqueous electrolytic solution battery |
| JP2004303754A (en) * | 2003-03-28 | 2004-10-28 | Nissan Diesel Motor Co Ltd | Method and apparatus for manufacturing electric double layer capacitor |
| JP2005056645A (en) * | 2003-08-01 | 2005-03-03 | Matsushita Electric Ind Co Ltd | Non-aqueous electrolyte secondary battery and manufacturing method thereof |
| US7854773B2 (en) | 2003-09-30 | 2010-12-21 | Dai Nippon Printing Co., Ltd. | Method of producing an electrode plate for a nonaqueous electrolyte secondary battery |
| JP2005285607A (en) * | 2004-03-30 | 2005-10-13 | Matsushita Electric Ind Co Ltd | Non-aqueous secondary battery and manufacturing method thereof |
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| WO2011135684A1 (en) * | 2010-04-28 | 2011-11-03 | トヨタ自動車株式会社 | Non-aqueous electrolyte secondary battery, vehicle, and battery-use apparatus |
| US10164242B2 (en) | 2011-04-07 | 2018-12-25 | Massachusetts Institute Of Technology | Controlled porosity in electrodes |
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| JP2013008523A (en) * | 2011-06-23 | 2013-01-10 | Hitachi Vehicle Energy Ltd | Electrode for battery and method for manufacturing the same |
| WO2013084806A1 (en) * | 2011-12-05 | 2013-06-13 | 日産自動車株式会社 | Air battery and battery assembly using same |
| JPWO2013084806A1 (en) * | 2011-12-05 | 2015-04-27 | 日産自動車株式会社 | Air battery and battery pack using the same |
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| CN103682249A (en) * | 2012-09-07 | 2014-03-26 | 罗伯特·博世有限公司 | Battery with porous electrode |
| JP2013033746A (en) * | 2012-10-02 | 2013-02-14 | Nissan Motor Co Ltd | Electrode for battery and manufacturing method thereof |
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| US10569480B2 (en) | 2014-10-03 | 2020-02-25 | Massachusetts Institute Of Technology | Pore orientation using magnetic fields |
| US10675819B2 (en) | 2014-10-03 | 2020-06-09 | Massachusetts Institute Of Technology | Magnetic field alignment of emulsions to produce porous articles |
| JP2018092857A (en) * | 2016-12-07 | 2018-06-14 | 三洋電機株式会社 | Anode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery |
| US11728519B2 (en) | 2020-09-17 | 2023-08-15 | Prime Planet Energy & Solutions, Inc. | Secondary battery |
| WO2022181489A1 (en) | 2021-02-25 | 2022-09-01 | 三洋電機株式会社 | Negative electrode for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery |
| WO2023189222A1 (en) * | 2022-03-30 | 2023-10-05 | 株式会社村田製作所 | Electrode foil, capacitor element and solid electrolytic capacitor |
| WO2024077493A1 (en) * | 2022-10-11 | 2024-04-18 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, lithium-ion battery and electric device |
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