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KR20060087183A - Electrode plate for secondary battery and manufacturing method thereof - Google Patents

Electrode plate for secondary battery and manufacturing method thereof Download PDF

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KR20060087183A
KR20060087183A KR1020050008095A KR20050008095A KR20060087183A KR 20060087183 A KR20060087183 A KR 20060087183A KR 1020050008095 A KR1020050008095 A KR 1020050008095A KR 20050008095 A KR20050008095 A KR 20050008095A KR 20060087183 A KR20060087183 A KR 20060087183A
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current collector
electrode current
active material
secondary battery
material layer
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KR100624971B1 (en
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김영준
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삼성에스디아이 주식회사
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/32Safety or protective measures for persons during the construction of buildings
    • E04G21/3261Safety-nets; Safety mattresses; Arrangements on buildings for connecting safety-lines
    • E04G21/3266Safety nets
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/32Safety or protective measures for persons during the construction of buildings
    • E04G21/3204Safety or protective measures for persons during the construction of buildings against falling down
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G3/00Scaffolds essentially supported by building constructions, e.g. adjustable in height
    • E04G3/18Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by cantilevers or other provisions mounted in openings in the building, e.g. window openings

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

본 발명은 도전성을 구비하며 다공성 재질로 이루어지는 전극 집전체를 이용하여 전극 집전체와 활물질층 사이의 접촉 저항이 감소된 이차 전지용 전극판 및 이의 제조 방법에 관한 것으로, 본 발명의 이차 전지용 전극판은 다공성 재질의 전극 집전체와; 상기 전극 집전체의 적어도 일면 상에 형성되며, 이차 전지 반응에 참여하는 활물질을 포함하는 활물질층을 포함하여 이루어진다. The present invention relates to an electrode plate for a secondary battery and a method of manufacturing the same, wherein the contact resistance between the electrode current collector and the active material layer is reduced by using an electrode current collector having conductivity and a porous material. An electrode current collector made of a porous material; It is formed on at least one surface of the electrode current collector, and comprises an active material layer containing an active material participating in the secondary battery reaction.

이차 전지용 전극판, 다공성 전극 집전체, 기공Electrode plate for secondary battery, porous electrode current collector, pores

Description

이차 전지용 전극판 및 이의 제조 방법{Electrode Plate of Secondary Battery and Method of fabricating the same}Electrode plate for secondary battery and manufacturing method thereof {Electrode Plate of Secondary Battery and Method of fabricating the same}

도 1은 본 발명의 일 실시예에 따른 이차 전지용 전극판의 제조 방법을 설명하기 위한 공정 흐름도. 1 is a process flowchart for explaining a method of manufacturing an electrode plate for a secondary battery according to an embodiment of the present invention.

도 2a 내지 도 2d는 본 발명의 일 실시예에 따른 이차 전지용 전극판의 제조 방법을 설명하기 위한 도면. 2A to 2D are views for explaining a method of manufacturing an electrode plate for a secondary battery according to an embodiment of the present invention.

(도면의 주요 부위에 대한 부호의 설명)(Explanation of symbols for main parts of drawing)

100; 전극 집전체100; Electrode current collector

110; 기공110; pore

200; 활물질층200; Active material layer

본 발명은 이차 전지용 전극판 및 이의 제조 방법에 관한 것으로, 더욱 상세하게는 도전성을 구비하며 다공성 재질로 이루어지는 전극 집전체를 이용하여 전극 집전체와 활물질층 사이의 접촉 저항이 감소된 이차 전지용 전극판 및 이의 제조 방법에 관한 것이다. The present invention relates to an electrode plate for a secondary battery and a method of manufacturing the same, and more particularly, to a secondary battery electrode plate having a reduced contact resistance between an electrode current collector and an active material layer using an electrode current collector having conductivity and a porous material. And to a method for producing the same.

최근에는 셀룰라 폰, 노트북 컴퓨터, 캠코더 등의 콤팩트하고 경량화된 전기/전자장치들이 활발하게 개발 및 생산되고 있다. 이러한 휴대용 전기/전자장치들은 별도의 전원이 구비되지 않은 장소에서도 작동될 수 있도록 전지 팩을 내장하고 있다. 내장된 전지 팩은 휴대용 전기/전자장치를 일정기간동안 구동시키기 위해 일정 레벨의 전압을 출력시킬 수 있도록 내부에 적어도 하나의 전지를 구비하고 있다. Recently, compact and lightweight electric / electronic devices such as cellular phones, notebook computers, camcorders, etc. have been actively developed and produced. These portable electric / electronic devices have a battery pack that can be operated in a place where no separate power source is provided. The built-in battery pack includes at least one battery therein for outputting a predetermined level of voltage for driving the portable electric / electronic device for a period of time.

상기 전지 팩은 경제적인 측면을 고려하여 최근에는 충방전이 가능한 이차전지를 채용하고 있다. 이차전지에는 대표적으로, 니켈-카드뮴(Ni-Cd) 전지와 니켈-수소(Ni-MH)전지 및 리튬(Li) 전지와 리튬 이온(Li-ion) 전지 등의 리튬 이차 전지 등이 있다. In view of economical aspects, the battery pack employs a secondary battery capable of charging and discharging. Representative secondary batteries include lithium secondary batteries such as nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries.

특히, 리튬 이온 이차 전지는 작동 전압이 3.6V로서, 휴대용 전자 장비 전원으로 많이 사용되고 있는 니켈-카드뮴 전지나, 니켈-수소 전지보다 3배나 높고, 단위 중량당 에너지 밀도가 높다는 측면에서 급속도로 신장되고 있는 추세이다. In particular, the lithium ion secondary battery has an operating voltage of 3.6 V, which is three times higher than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for portable electronic equipment, and is rapidly expanding in terms of high energy density per unit weight. It is a trend.

이러한 리튬 이온 이차 전지는 주로 양극 활물질로 리튬계 산화물, 음극 활물질로는 탄소재를 사용하고 있다. 일반적으로는, 전해액의 종류에 따라 액체 전해질 전지와, 고분자 전해질 전지로 분류되며, 액체 전해질을 사용하는 전지를 리튬 이온 전지라 하고, 고분자 전해질을 사용하는 전지를 리튬 폴리머 전지라고 한다. 또한, 리튬 이온 이차 전지는 여러 가지 형상으로 제조되고 있는데, 대표적인 형상으로는 원통형과, 각형과, 파우치형을 들 수 있다. Such lithium ion secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. In general, a battery is classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte, and a battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery. In addition, although lithium ion secondary batteries are manufactured in various shapes, typical shapes include a cylindrical shape, a square shape, and a pouch type.

통상적으로, 상기 리튬 이온 이차 전지는 양극 활물질이 코팅된 양극 전극판, 음극 활물질이 코팅된 음극 전극판 및 상기 양극 전극판과 음극 전극판 사이에 위치되어 쇼트를 방지하고 리튬 이온(Li-ion)의 이동만을 가능하게 하는 세퍼레이터가 권취된 전극 조립체와, 상기 전극 조립체를 수용하는 리튬 이온 이차 전지용 케이스와, 상기 리튬 이온 이차 전지용 케이스 내측에 주입되어 리튬 이온의 이동을 가능하게 하는 전해액 등으로 이루어져 있다. Typically, the lithium ion secondary battery is positioned between the positive electrode plate coated with a positive electrode active material, the negative electrode plate coated with a negative electrode active material, and between the positive electrode plate and the negative electrode plate to prevent a short and to prevent lithium ions (Li-ion). A lithium ion secondary battery case accommodating the electrode assembly, an electrolyte solution injected into the lithium ion secondary battery case to allow lithium ions to move, and the like; .

이러한 리튬 이온 이차 전지는 상기 양극 활물질이 코팅되며 양극 탭이 연결된 양극 전극판, 음극 활물질이 코팅되며, 음극 탭이 연결된 음극 전극판 및 세퍼레이터를 적층한 후, 이를 권취하여 전극 조립체를 제조한다. The lithium ion secondary battery is coated with the positive electrode active material and the positive electrode tab is connected to the positive electrode tab, the negative electrode active material is coated, the negative electrode tab is connected to the negative electrode plate and the separator is laminated, and then wound to prepare an electrode assembly.

그런 다음, 상기 전극 조립체를 상기 리튬 이온 이차 전지용 케이스에 수용하여 상기 전극 조립체가 이탈하지 않도록 한 후, 상기 리튬 이온 이차 전지용 케이스에 전해액을 주입한 후, 밀봉하여 리튬 이온 이차 전지를 완성한다. Then, the electrode assembly is accommodated in the case for the lithium ion secondary battery to prevent the electrode assembly from being separated, the electrolyte is injected into the case for the lithium ion secondary battery, and then sealed to complete the lithium ion secondary battery.

한편, 상기한 바와 같은 리튬 이온 이차 전지의 양극 및 음극 전극판은 활물질, 도전재 및 결합제를 유기 용매와 혼합하여 슬러리를 제조한 후, 전극 집전체 상에 도포하여, 활물질층을 형성하는 공정을 통하여 형성된다. Meanwhile, the positive electrode and the negative electrode plate of the lithium ion secondary battery as described above are prepared by mixing an active material, a conductive material, and a binder with an organic solvent to prepare a slurry, and then coating the electrode current collector to form an active material layer. It is formed through.

그러나, 상기한 바와 같은 양극 전극판 및 음극 전극판은 상기 전극 집전체 상에 활물질층이 형성된 구조로 이루어져, 상기 전극 집전체와 활물질층의 경계면에서 접촉 저항이 증가하는 문제점이 있다. 이는 상기 전극 집전체와 활물질층의 접촉이 면 접촉을 통하여 이루어져, 접촉 저항과 관계 있는 접촉 면적의 향상에 제약이 따르기 때문이다. However, the positive electrode plate and the negative electrode plate as described above have a structure in which an active material layer is formed on the electrode current collector, so that a contact resistance increases at an interface between the electrode current collector and the active material layer. This is because the contact between the electrode current collector and the active material layer is made through surface contact, and thus, a limitation is placed on the improvement of the contact area related to the contact resistance.

따라서, 상기 양극 전극판 및 음극 전극판을 구비하는 이차 전지의 내부 저항이 증가하게 되며, 이는 이차 전지의 전지 용량에 비하여 방전 효율이 감소하는 문제점으로 연결된다. Therefore, the internal resistance of the secondary battery having the positive electrode plate and the negative electrode plate is increased, which leads to a problem that the discharge efficiency is reduced compared to the battery capacity of the secondary battery.

본 발명의 목적은 상기한 종래 기술의 문제점을 해결하기 위한 것으로, 본 발명은 도전성을 구비하며 다공성 재질로 이루어지는 전극 집전체를 이용하여 전극 집전체와 활물질층 사이의 접촉 저항이 감소된 이차 전지용 전극판 및 이의 제조 방법을 제공하는 데에 그 목적이 있다. An object of the present invention is to solve the above problems of the prior art, the present invention is a secondary battery electrode having a reduced contact resistance between the electrode current collector and the active material layer using an electrode current collector having a conductive material and made of a porous material It is an object to provide a plate and a method for producing the same.

상기한 목적을 달성하기 위한 본 발명의 이차 전지용 전극판은 다공성 재질의 전극 집전체와; 상기 전극 집전체의 적어도 일면 상에 형성되며, 이차 전지 반응에 참여하는 활물질을 포함하는 활물질층을 포함하여 이루어진다. A secondary battery electrode plate of the present invention for achieving the above object is an electrode current collector of a porous material; It is formed on at least one surface of the electrode current collector, and comprises an active material layer containing an active material participating in the secondary battery reaction.

바람직하게는 상기 활물질층은 일부가 상기 다공성 전극 집전체의 기공 내로 침투된 형태로 이루어진다. Preferably, the active material layer has a form in which a portion of the active material layer penetrates into pores of the porous electrode current collector.

상기 다공성 재질의 전극 집전체는 니켈(Ni), 구리(Cu) 및 SUS 중 어느 하나의 재질로 이루어지는 다공성 메탈 폼(metal foam)인 것이 바람직하다. The electrode current collector of the porous material is preferably a porous metal foam (metal foam) made of any one of nickel (Ni), copper (Cu) and SUS.

상기 다공성 재질의 전극 집전체는 외부 표면에 알루미늄(Al)이 도금된 니켈(Ni) 재질의 다공성 메탈 폼 또는 외부 표면에 구리(Cu)가 무전해 도금된 SUS 재질의 매탈 폼으로 이루어지는 것이 바람직하다. The electrode current collector of the porous material is preferably made of a porous metal foam of nickel (Ni) plated aluminum (Al) on the outer surface or a metal foam of SUS material electroless plated copper (Cu) on the outer surface. .

또한, 본 발명의 이차 전지용 전극판의 제조 방법은 다공성 전극 집전체를 준비하는 단계와; 상기 전극 집전체의 적어도 일면에 활물질층을 형성하는 단계와; 상기 활물질층이 형성된 상기 전극 집전체를 압착하는 단계를 포함하여 이루어진 다. In addition, the method of manufacturing an electrode plate for a secondary battery of the present invention comprises the steps of preparing a porous electrode current collector; Forming an active material layer on at least one surface of the electrode current collector; Comprising the step of compressing the electrode current collector on which the active material layer is formed.

상기 활물질층이 형성된 상기 전극 집전체를 압착하는 단계를 롤링 공정을 이용하여 수행하는 것이 바람직하다. It is preferable to perform the step of compressing the electrode current collector on which the active material layer is formed using a rolling process.

이하 첨부된 도면을 참조하여, 본 발명의 실시예를 설명한다. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 일 실시예에 따른 이차 전지용 전극판의 제조 방법을 설명하기 위한 공정 흐름도이다. 1 is a process flowchart illustrating a method of manufacturing an electrode plate for a secondary battery according to an embodiment of the present invention.

도 2a 내지 도 2d는 본 발명의 일 실시예에 따른 이차 전지용 전극판의 제조 방법을 설명하기 위한 도면으로, 도 1a에 도시된 각 단계를 설명한다. 2A to 2D are diagrams for describing a method of manufacturing an electrode plate for a secondary battery according to an embodiment of the present invention, and each step illustrated in FIG. 1A will be described.

여기서는 상기 도 1 및 도 2a 내지 도 2d를 함께 참조하여, 본 발명의 일 실시예에 따른 이차 전지용 전극판 및 이의 제조 방법을 설명한다. Here, the electrode plate for a secondary battery and a method of manufacturing the same according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2A to 2D.

도시된 바와 같이, 본 발명의 일 실시예에 따른 이차 전지용 전극판은 다공성(porous) 재질의 전극 집전체(100)와, 이차 전지 반응에 참여하는 활물질을 포함하는 활물질층(200)을 구비하며, 상기 전극 집전체(100)의 다공성 특징을 나타내도록 하는 다수의 기공(110)에 상기 활물질층(200)을 이루는 물질의 일부가 침투한 형태로 이루어진다. As shown, an electrode plate for a secondary battery according to an embodiment of the present invention includes an active material layer 200 including an electrode current collector 100 of a porous material and an active material participating in a secondary battery reaction. In addition, a portion of the material forming the active material layer 200 penetrates into the plurality of pores 110 to show the porous characteristics of the electrode current collector 100.

상기 전극 집전체(100)는 상기 전극 집전체(100)의 다공성 특성을 나타내도록 하는 다수의 작은 기공(110, porosity)이 상기 전극 집전체(100)를 규칙적 또는 불규칙적으로 배열될 수 있으며, 또한, 상기 전극 집전체(100)를 관통 또는 미관통하는 구조로 이루어질 수 있다. The electrode current collector 100 has a plurality of small pores (110, porosity) to show the porous characteristics of the electrode current collector 100 may be arranged regularly or irregularly to the electrode current collector 100, The electrode collector 100 may be formed to penetrate or not penetrate the electrode current collector 100.

또한, 상기 전극 집전체(100)가 양극 집전체인 경우, 상기 전극 집전체(100) 는 SUS(steel use stainless) 재질의 다공성 메탈 폼(metal foam)으로 이루어질 수 있으며, 또는 외부 표면에 알루미늄(Al)이 도금된 니켈(Ni) 재질의 다공성 메탈 폼으로 이루어질 수 있다. In addition, when the electrode current collector 100 is a positive electrode current collector, the electrode current collector 100 may be made of a porous metal foam made of SUS (steel use stainless), or may be made of aluminum on an outer surface thereof. Al) may be made of a porous metal foam made of nickel (Ni).

또한, 상기 전극 집전체(100)가 음극 집전체인 경우, 상기 전극 집전체(100)는 니켈(Ni), 구리(Cu) 또는 SUS 재질의 다공성 매탈 폼으로 이루어질 수 있으며, 또는 외부 표면에 구리(Cu)가 무전해 도금된 SUS 재질의 매탈 폼으로 이루어질 수 있다. In addition, when the electrode current collector 100 is a negative electrode current collector, the electrode current collector 100 may be made of a porous metal foam made of nickel (Ni), copper (Cu), or SUS, or copper on an outer surface thereof. (Cu) may be made of a metal foam of SUS material electroless plated.

상기 활물질층(200)은 일반적으로 상기 활물질과 결합제가 혼합되어 상기 전극 집전체(100) 상에 도포되어 형성된다. The active material layer 200 is generally formed by mixing the active material and the binder is coated on the electrode current collector (100).

상기 활물질층(200)이 양극 활물질층인 경우, 상기 양극 활물질로는 칼코게나이드(chalcogenide) 화합물이 사용되고 있으며, 그 예로 LiCoO2, LiMn2O4, LiNiO2, LiNi1-xCoxO2(0<x<1), LiMnO2 등의 복합 금속 산화물들이 사용되고 있다. When the active material layer 200 is a positive electrode active material layer, a chalcogenide compound is used as the positive electrode active material, and examples thereof include LiCoO 2, LiMn 2 O 4, LiNiO 2, LiNi 1-x Cox O 2 (0 <x <1), and LiMnO 2. Composite metal oxides are used.

또한, 상기 활물질층(200)이 음극 활물질층인 경우, 음극 활물질로는 탄소(C) 계열 물질, Si, Sn, 틴 옥사이드, 틴 합금 복합체(composite tin alloys), 전이 금속 산화물, 리튬 금속 나이트라이드 또는 리튬 금속 산화물 등이 사용되고 있으나, 본 발명에서 상기 양극 활물질 및 음극 활물질을 한정하는 것은 아니다. In addition, when the active material layer 200 is a negative electrode active material layer, the negative electrode active material is a carbon (C) -based material, Si, Sn, tin oxide, composite tin alloys, transition metal oxide, lithium metal nitride Or lithium metal oxide or the like is used, but the present invention is not limited to the positive electrode active material and negative electrode active material.

상기한 바와 같은 이차 전지용 전극판은 하기한 바와 같이 형성된다. The above-mentioned electrode plate for secondary batteries is formed as follows.

우선, 도 1을 참조하면, 본 발명의 실시예에 따른 이차 전지용 전극판은 다공성 전극 집전체를 준비하는 단계(S1)와, 활물질을 도포하는 단계(S2)와, 활물질이 도포된 전극 집전체를 압착하는 단계(S3)를 포함하여 형성된다. First, referring to FIG. 1, an electrode plate for a secondary battery according to an embodiment of the present invention may include preparing a porous electrode current collector (S1), applying an active material (S2), and an electrode current collector coated with an active material. It is formed including a step (S3) for pressing.

우선, 다공성 전극 집전체(100)를 준비하는 단계(S1)에서는 도 2a에 도시된 바와 같이, 다수의 미세 기공(110)을 구비하는 다공성 재질의 전극 집전체(100)를 준비한다. First, in preparing the porous electrode current collector 100 (S1), as shown in FIG. 2A, an electrode current collector 100 of a porous material having a plurality of fine pores 110 is prepared.

그런 다음, 활물질을 도포하는 단계(S2)에서는 도 2b에서와 같이, 상기 다공성 재질의 전극 집전체(100)의 적어도 일면상에 활물질을 코팅하여 활물질층(200)을 형성한다. Then, in the step of applying the active material (S2), as shown in Figure 2b, to form an active material layer 200 by coating the active material on at least one surface of the electrode current collector 100 of the porous material.

이러한 상기 활물질층(200)은 상기 활물질을 상기 전극 집전체(100)에 결착시키며, 상기 이차 전지용 전극판의 기계적 강도를 유지하는 결합제와 함께 용매를 통하여 혼합된 슬러리를 상기 전극 집전체(100)의 적어도 일면상에 코팅하여 형성된다. 또한, 상기 활물질층(200)이 양극 활물질층인 경우, 상기 활물질에서 발생한 전자를 상기 전극 집전체(100)로 전달하는 도전제를 더 포함하여 형성된 슬러리를 코팅하여 형성된다. The active material layer 200 binds the active material to the electrode current collector 100, and mixes a slurry mixed through a solvent with a binder for maintaining the mechanical strength of the electrode plate for the secondary battery, the electrode current collector 100. It is formed by coating on at least one side of the. In addition, when the active material layer 200 is a positive electrode active material layer, it is formed by coating a slurry formed by further comprising a conductive agent for transferring electrons generated from the active material to the electrode current collector (100).

이때, 상기 활물질층(200)을 이루는 물질의 일부는 상기 전극 집전체(100)의 기공(110)으로 스며들게 된다. 이는 상기 전극 집전체(100) 상에 도포시에 상기 전극 집전체(100)가 다공성 재질로 이루어지므로, 상기 기공(110)보다 크기가 작은 입자들이 상기 기공(110) 속으로 침투하기 때문이다. In this case, a part of the material forming the active material layer 200 is permeated into the pores 110 of the electrode current collector 100. This is because since the electrode current collector 100 is made of a porous material when applied on the electrode current collector 100, particles smaller in size than the pores 110 penetrate into the pores 110.

이러한 상기 이차 전지용 전극판은 다공성 재질로 이루어지는 상기 전극 집전체(100)의 기공(110) 사이로 상기 활물질층(200)을 이루는 물질의 일부가 스며들어감으로써, 상기 전극 집전체(100)와 활물질층(200) 사이의 접촉 면적이 증가한다. 따라서, 상기 전극 집전체(100)와 상기 활물질층(200) 사이에 발생하는 접촉 저항이 감소하게 된다. 이는 상기 접촉 저항이 두 물질의 접촉 면적에 반비례하는 특성에 따른 것이다. The electrode plate for the secondary battery has a portion of the material constituting the active material layer 200 penetrates between the pores 110 of the electrode current collector 100 made of a porous material, the electrode current collector 100 and the active material layer The contact area between the 200 increases. Therefore, the contact resistance generated between the electrode current collector 100 and the active material layer 200 is reduced. This is due to the property that the contact resistance is inversely proportional to the contact area of the two materials.

다시 말하면, 상기 전극 집전체(100)와 상기 활물질층(200) 사이의 접촉 면적이 증가하게 됨으로써, 상기 전극 집전체(100)와 상기 활물질층(200) 사이의 접촉 저항이 감소하게 된다. In other words, the contact area between the electrode current collector 100 and the active material layer 200 increases, thereby reducing the contact resistance between the electrode current collector 100 and the active material layer 200.

상기 활물질이 도포된 전극 집전체를 압착하는 단계(S3)에서는 상기 전극 집전체(100)의 적어도 일면상에 상기 활물질층(200)을 형성한 후, 도 2c에서와 같이 상기 활물질층(200)이 형성된 상기 전극 집전체(100)를 롤링 공정 등을 통하여 압착하여 도 2d에 도시된 바와 같은 이차 전지용 전극판을 형성한다. In the step S3 of compressing the electrode current collector to which the active material is applied, after forming the active material layer 200 on at least one surface of the electrode current collector 100, the active material layer 200 as shown in FIG. 2C. The formed electrode current collector 100 is pressed through a rolling process or the like to form an electrode plate for a secondary battery as illustrated in FIG. 2D.

이후에는 도면 상에는 도시하지 않았으나, 일반적으로 전극 탭을 부착하는 등의 공정을 더 수행할 수도 있다. Thereafter, although not shown in the drawings, in general, a process such as attaching an electrode tab may be further performed.

상기한 바와 같은 본 발명의 실시예에 따른 이차 전지용 전극판은 다공성 재질의 전극 집전체(100)의 기공(110) 속으로 상기 활물질층(200)의 일부가 침투되고 압착된 형태로 이루어지므로, 상기 전극 집전체(100)와 상기 활물질층(200) 사이의 접촉 저항이 감소된다. 따라서, 상기한 바와 같은 이차 전지용 전극판을 구비하는 이차 전지의 방전 효율이 향상된다. Since the electrode plate for the secondary battery according to the embodiment of the present invention as described above is made of a portion of the active material layer 200 penetrated into the pores 110 of the electrode current collector 100 of the porous material and pressed, The contact resistance between the electrode current collector 100 and the active material layer 200 is reduced. Therefore, the discharge efficiency of the secondary battery provided with the above-mentioned electrode plate for secondary batteries improves.

상기한 바와 같이 본 발명에 따르면, 본 발명은 도전성을 구비하며 다공성 재질로 이루어지는 전극 집전체를 이용하여 전극 집전체와 활물질층 사이의 접촉 저항이 감소된 이차 전지용 전극판 및 이의 제조 방법을 제공할 수 있다. According to the present invention as described above, the present invention provides an electrode plate for a secondary battery and a method of manufacturing the same, the contact resistance between the electrode current collector and the active material layer is reduced by using an electrode current collector having a conductivity and made of a porous material. Can be.                     

상기에서는 본 발명의 바람직한 실시예를 참조하여 설명하였지만, 해당 기술 분야의 숙련된 당업자는 하기의 특허 청구 범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다. While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (7)

다공성 재질의 전극 집전체와; An electrode current collector made of a porous material; 상기 전극 집전체의 적어도 일면 상에 형성되며, 이차 전지 반응에 참여하는 활물질을 포함하는 활물질층을 포함하는 것을 특징으로 하는 이차 전지용 전극판. And an active material layer formed on at least one surface of the electrode current collector and including an active material participating in a secondary battery reaction. 제 1항에 있어서, The method of claim 1, 상기 활물질층은 일부가 상기 다공성 전극 집전체의 기공 내로 침투된 것을 특징으로 하는 이차 전지용 전극판. Part of the active material layer is a secondary battery electrode plate, characterized in that penetrated into the pores of the porous electrode current collector. 제 1항에 있어서, The method of claim 1, 상기 다공성 재질의 전극 집전체는 니켈(Ni), 구리(Cu) 및 SUS 중 어느 하나의 재질로 이루어지는 다공성 메탈 폼(metal foam)인 것을 특징으로 하는 이차 전지용 전극판. The electrode current collector of the porous material is a secondary battery electrode plate, characterized in that the porous metal foam (metal foam) made of any one material of nickel (Ni), copper (Cu) and SUS. 제 1항에 있어서, The method of claim 1, 상기 다공성 재질의 전극 집전체는 외부 표면에 알루미늄(Al)이 도금된 니켈(Ni) 재질의 다공성 메탈 폼 또는 외부 표면에 구리(Cu)가 무전해 도금된 SUS 재질의 매탈 폼으로 이루어지는 것을 특징으로 하는 이차 전지용 전극판. The electrode current collector of the porous material is made of a porous metal foam of nickel (Ni) plated aluminum (Al) on the outer surface or a metal foam of SUS material electroless plated copper (Cu) on the outer surface An electrode plate for secondary batteries. 다공성 전극 집전체를 준비하는 단계와; Preparing a porous electrode current collector; 상기 전극 집전체의 적어도 일면에 활물질층을 형성하는 단계와; Forming an active material layer on at least one surface of the electrode current collector; 상기 활물질층이 형성된 상기 전극 집전체를 압착하는 단계를 포함하는 것을 특징으로 하는 이차 전지용 전극판의 제조 방법. And pressing the electrode current collector on which the active material layer is formed. 제 5항에 있어서, The method of claim 5, 상기 활물질층이 형성된 상기 전극 집전체를 압착하는 단계를 롤링 공정을 이용하여 수행하는 것을 특징으로 하는 이차 전지용 전극판의 제조 방법. And pressing the electrode current collector on which the active material layer is formed by using a rolling process. 제 5항에 있어서, The method of claim 5, 상기 활물질층의 형성 시 활물질층 물질의 일부가 상기 다공성 전극 집전체의 기공으로 스며드는 것을 특징으로 하는 이차 전지용 전극판의 제조 방법. A method of manufacturing an electrode plate for a secondary battery, wherein a part of an active material layer material penetrates into pores of the porous electrode current collector when the active material layer is formed.
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