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WO2024074151A1 - Batterie haute tension - Google Patents

Batterie haute tension Download PDF

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Publication number
WO2024074151A1
WO2024074151A1 PCT/CN2023/123455 CN2023123455W WO2024074151A1 WO 2024074151 A1 WO2024074151 A1 WO 2024074151A1 CN 2023123455 W CN2023123455 W CN 2023123455W WO 2024074151 A1 WO2024074151 A1 WO 2024074151A1
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WIPO (PCT)
Prior art keywords
voltage battery
negative electrode
lithium
carbon
battery according
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PCT/CN2023/123455
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Chinese (zh)
Inventor
曾长安
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Zhuhai Cosmx Battery Co Ltd
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Zhuhai Cosmx Battery Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • 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

Definitions

  • the present disclosure belongs to the field of battery technology, and specifically relates to a high-voltage battery, and in particular to a high-voltage battery with good high-temperature performance.
  • lithium-ion batteries Since the commercialization of lithium-ion batteries, they have been widely used in digital, energy storage, power, military aerospace and communication equipment due to their light weight, high specific energy, no memory effect and good cycle performance. With the widespread application of lithium-ion batteries, consumers have put forward higher requirements for the energy density, cycle life, high temperature performance, safety and other performance of lithium-ion batteries. In order to improve the energy density, the charging voltage of the positive electrode can be increased. However, with the increase of the positive electrode voltage, the oxidation of the transition metal on the surface of the positive electrode becomes higher, and the electrolyte is prone to oxidation and decomposition reaction on the surface of the positive electrode.
  • the electrolyte will produce hydrofluoric acid (HF), which will corrode the positive electrode, causing the dissolution of the transition metal ions of the positive electrode.
  • HF hydrofluoric acid
  • the dissolved transition metal ions migrate to the negative electrode, which will destroy the SEI film of the negative electrode, resulting in the deterioration of the battery cycle and 45°C interval cycle performance or even diving.
  • the present disclosure provides a high-voltage battery.
  • the present disclosure solves the problem of poor room temperature cycle performance, high temperature cycle performance, high temperature storage performance and 45°C interval cycle performance of high-voltage (4.45V or above) batteries due to the presence of hydrofluoric acid (HF) in the electrolyte system by using a specially treated positive electrode current collector.
  • HF hydrofluoric acid
  • a high voltage battery comprising a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte;
  • the positive electrode sheet comprises a positive electrode current collector, a protective layer and a positive electrode active material layer;
  • the protective layer is arranged on at least one side of the positive electrode current collector, and the positive electrode active material layer is arranged on the surface of the protective layer;
  • the electrolyte comprises an organic solvent and a lithium salt, and the high voltage battery meets the following requirements:
  • b is the sum of the concentrations of all lithium salts in the electrolyte.
  • a is 1, 2, 3, 4, 5, or a range consisting of two or more of the above values.
  • Arbitrary point value When a ⁇ 1, the protective layer is too thin to completely prevent the electrolyte from corroding the positive electrode current collector (such as aluminum foil), and the improvement effect on the high temperature cycle performance and 45°C interval cycle performance of the battery is not obvious, but it will deteriorate the performance of the battery; when a>5, the protective layer is thicker, which will affect the energy density of the battery.
  • 0.5 ⁇ b ⁇ 3 for example, b is 0.5, 0.8, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.8, 2, 2.5, 2.8, 3 or any point value in the range consisting of any two of the above point values.
  • the protective layer includes a protective material
  • the protective material is selected from one or more of the following substances: carbon, Al 2 O 3 , TiO 2 , MgO, FeO, Fe 2 O 3 , Fe 3 O 4 , Cr 2 O 3 , CoO, Ce 2 O 3 , In 2 O 3 , Ti 2 O 3 , V 2 O 5 , WO 3 , ZnO, Nb 2 O 5 , NiO, SnO 2 and AlF 3 , wherein some substances may contain multiple isomers, such as the isomers of Al 2 O 3 include ⁇ -Al 2 O 3 , ⁇ -Al 2 O 3 and ⁇ -Al 2 O 3 , wherein the carbon may be amorphous carbon, carbon black, hard carbon, soft carbon, carbon nanotubes, conductive graphite, and the like.
  • the protective layer may further include at least one of a first conductive agent and a first adhesive.
  • the conductive agent and the adhesive are defined as follows.
  • the mass percentage of each component in the protective layer is: 90wt% to 100wt% of the protective material (for example, 90wt%, 91wt%, 92wt%, 93wt%, 94wt%, 95wt%, 96wt%, 97wt%, 98wt%, 99wt% or 100wt%), 0wt% to 5wt% of the first conductive agent (for example, 5wt%, 4.5wt%, 4wt%, 3.5wt%, 3wt%, 2.5wt%, 2wt%, 1.5wt%, 1wt%, 0.5wt% or 0wt%), and 0wt% to 5wt% of the first binder (for example, 5wt%, 4.5wt%, 4wt%, 3.5wt%, 3wt%, 2.5wt%, 2wt%, 1.5wt%, 1wt%, 0.5wt% or 0wt%), and 0wt
  • the organic solvent is selected from one or more of carbonates and/or carboxylates.
  • the carbonate is selected from one or more of the following fluorinated or unsubstituted solvents: ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate.
  • the carboxylic acid ester is selected from one or more of the following fluorinated or unsubstituted solvents: propyl acetate, n-butyl acetate, isobutyl acetate, n-amyl acetate, isoamyl acetate, ethyl propionate, n-propyl propionate, methyl butyrate and ethyl butyrate.
  • the electrolyte further includes one or more of the following additives: vinylene carbonate, vinyl carbonate, fluoroethylene carbonate, vinyl sulfite, lithium difluorophosphate, methylene disulfonate, vinyl sulfate, succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, sunflower dinitrile, 1,3,6-hexanetrinitrile, 3-methoxypropionitrile, glycerol trinitrile, 1,2-bis(2-cyanoethoxy)ethane, 1,3-propane sultone and propenyl-1,3-sultone.
  • additives vinylene carbonate, vinyl carbonate, fluoroethylene carbonate, vinyl sulfite, lithium difluorophosphate, methylene disulfonate, vinyl sulfate, succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, sunflower
  • the lithium salt includes lithium bis(fluorosulfonyl)imide and/or lithium bis(trifluoromethylsulfonyl)imide.
  • the lithium salt further comprises lithium hexafluorophosphate, lithium difluorophosphate and tetrafluoroborate.
  • lithium hexafluorophosphate lithium difluorophosphate
  • tetrafluoroborate lithium hexafluorophosphate
  • lithium difluorophosphate lithium difluorophosphate
  • tetrafluoroborate lithium oxides
  • the positive electrode active material layer includes a positive electrode active material, a second conductive agent, and a second binder.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on one or both sides of the negative electrode current collector, and the negative electrode active material layer includes a negative electrode active material, a third conductive agent and a third binder.
  • the mass percentage of each component in the positive electrode active material layer is: 80wt% to 99.8wt% of the positive electrode active material (for example, 80wt%, 85wt%, 90wt%, 95wt% or 99.8wt%), 0.1wt% to 10wt% of the second conductive agent (for example, 10wt%, 7.5wt%, 5wt%, 2.5wt% or 0.1wt%), and 0.1wt% to 10wt% of the second binder (for example, 10wt%, 7.5wt%, 5wt%, 2.5wt% or 0.1wt%).
  • the mass percentage of each component in the positive electrode active material layer is: 90wt% to 99.6wt% of the positive electrode active material, 0.2wt% to 5wt% of the second conductive agent, and 0.2wt% to 5wt% of the second binder.
  • the mass percentage of each component in the negative electrode active material layer is: 80wt% to 99.8wt% of the negative electrode active material (for example, 80wt%, 85wt%, 90wt%, 95wt% or 99.8wt%), 0.1wt% to 10wt% of the third conductive agent (for example, 10wt%, 7.5wt%, 5wt%, 2.5wt% or 0.1wt%), and 0.1wt% to 10wt% of the third binder (for example, 10wt%, 7.5wt%, 5wt%, 2.5wt% or 0.1wt%).
  • the mass percentage of each component in the negative electrode active material layer is: 90wt% to 99.6wt% of the negative electrode active material, 0.2wt% to 5wt% of the third conductive agent, and 0.2wt% to 5wt% of the third binder.
  • the negative electrode active material layer may further include a thickener, and the mass percentage of each component in the negative electrode active material layer is: 80wt% to 99.8wt% of the negative electrode active material (for example, 80wt%, 85wt%, 90wt%, 95wt% or 99.8wt%), 0.05wt% to 10wt% of the third conductive agent (for example, 10wt%, 5wt%, 1wt% or 0.05wt%), 0.05wt% to 5wt% of the third binder (for example, 5wt%, 1wt% or 0.05wt%) and 0.1wt% to 5wt% of the thickener (for example, 10wt%, 5wt%, 1wt% or 0.1wt%).
  • 80wt% to 99.8wt% of the negative electrode active material for example, 80wt%, 85wt%, 90wt%, 95wt% or 99.8wt%
  • the mass percentage of each component in the negative electrode active material layer is: 91wt% to 99wt% of negative electrode active material, 0.1wt% to 4wt% of the third conductive agent, 0.1wt% to 2.5wt% of the third binder and 0.1wt% to 2.5wt% of the thickener.
  • the first conductive agent, the second conductive agent and the third conductive agent are each independently selected from at least one of conductive carbon black, acetylene black, Ketjen black, conductive graphite, conductive carbon fiber, carbon nanotubes and metal powder.
  • the first binder, the second binder and the third binder are each independently selected from at least one of sodium carboxymethyl cellulose, lithium carboxymethyl cellulose, styrene-butadiene rubber, polytetrafluoroethylene, polyvinylidene fluoride and polyethylene oxide.
  • the positive electrode active material in the positive electrode active material layer is selected from one or more of layered lithium composite oxides, lithium manganate and ternary materials.
  • the formula is Li (1+x) Ni y Co z M (1-yz) O 2 , wherein -0.1 ⁇ x ⁇ 1; 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1, and 0 ⁇ y+z ⁇ 1; wherein M is one or more of Mg, Zn, Ga, Ba, Al, Fe, Cr, Sn, V, Mn, Sc, Ti, Nb, Mo and Zr.
  • the negative electrode active material in the negative electrode active material layer is selected from one or more of carbon-based negative electrode materials, silicon-based negative electrode materials, tin-based negative electrode materials or their corresponding alloy materials.
  • the carbon-based negative electrode material includes at least one of artificial graphite, natural graphite, mesophase carbon microbeads, hard carbon and soft carbon.
  • the silicon-based negative electrode material is selected from at least one of nano-silicon (Si), silicon-oxygen negative electrode material (SiOx (0 ⁇ x ⁇ 2)) and silicon-carbon negative electrode material.
  • the tin-based negative electrode material is selected from one or more of metallic tin, tin oxide, tin alloy material and tin-based composite oxide.
  • the operating cut-off voltage of the high voltage battery is 4.45V and above.
  • the present disclosure provides a high-voltage battery.
  • the high-voltage battery of the present disclosure can solve the corrosion of HF generated by the decomposition of lithium hexafluorophosphate to the positive transition metal ions.
  • the electrolyte includes lithium bis(fluorosulfonyl)imide and/or lithium bis(trifluoromethylsulfonyl)imide, no hydrofluoric acid is generated, so that the positive transition metal will not be corroded, and the transition metal ions will not be dissolved.
  • the side reactions on the positive electrode surface and the gas production and interface protection layer destruction and phase change caused by the side reactions can be reduced.
  • lithium bis(fluorosulfonyl)imide and lithium bis(trifluoromethylsulfonyl)imide as the main lithium salts may cause certain corrosion to the positive current collector.
  • Coating a protective layer of a certain thickness on the positive current collector can solve the problem of corrosion to the positive current collector. Therefore, through the above-mentioned synergistic effect, the problems of poor normal temperature cycle performance, high temperature cycle performance, high temperature storage performance and 45°C interval cycle performance of the high-voltage battery are solved.
  • the positive electrode active material 4.5V lithium cobalt oxide (LCO), the binder polyvinylidene fluoride (PVDF) and the conductive agent Acetylene black is mixed in a weight ratio of 98:1.5:0.5, N-methylpyrrolidone (NMP) is added, and the mixture is stirred under the action of a vacuum stirrer until the mixed system becomes a positive electrode slurry with uniform fluidity; the positive electrode slurry is evenly coated on an aluminum foil with a thickness of 9 ⁇ m; the coated aluminum foil is baked in an oven with 5 different temperature gradients, and then dried in an oven at 120°C for 8 hours, and then rolled and cut to obtain a positive electrode sheet.
  • LCO lithium cobalt oxide
  • PVDF binder polyvinylidene fluoride
  • Acetylene black Acetylene black
  • the negative electrode active material graphite artificial graphite
  • the binder styrene butadiene rubber and the conductive agent acetylene black were mixed in a weight ratio of 97:1:1:1, and deionized water was added to obtain a negative electrode slurry under the action of a vacuum mixer; the negative electrode slurry was evenly coated on a copper foil with a thickness of 8 ⁇ m; the copper foil was dried at room temperature and then transferred to an oven at 80°C for drying for 10 hours, and then cold pressed and cut to obtain a negative electrode sheet, the compaction density of the negative electrode sheet was 1.80 g/ cm3 , and the surface density was 9.5 mg/ cm2 .
  • ethylene carbonate, propylene carbonate and n-propyl propionate are mixed evenly in a mass ratio of 15:15:70 (the solvent and the additive need to be normalized together), the solvent is frozen at a low temperature of about -10°C for 2-5h, and then a fully dried lithium salt (as shown in Table 1) is quickly added thereto, stirred evenly, and then 8wt% of fluoroethylene carbonate, 4wt% of 1,3-propane sultone, 1wt% of succinonitrile, 1wt% of adiponitrile, 3wt% of 1,3,6-hexanetrinitrile, and 0.3wt% of lithium difluorophosphate are added, and stirred again until uniform. After the moisture and free acid tests are qualified, the electrolyte of Comparative Example 1 is obtained.
  • a polyethylene diaphragm with a thickness of 8 ⁇ m (provided by Asahi Kasei Corporation) was selected.
  • the positive electrode sheet, separator and negative electrode sheet prepared above are stacked in order, ensuring that the separator is between the positive and negative electrode sheets to play an isolating role, and then a bare battery cell without liquid injection is obtained by winding; the bare battery cell is placed in an outer packaging foil, and the prepared electrolyte is injected into the dried bare battery cell. After vacuum packaging, standing, forming, shaping, sorting and other processes, the required lithium-ion battery is obtained.
  • the thickness D 0 of the fully charged cell was tested.
  • the battery was placed in a (25 ⁇ 3)°C environment and left to stand for 3 hours.
  • the cell body reached (25 ⁇ 3)°C, the battery was charged to 4.2V at 1C, then charged to 4.5V at 0.7C, then charged to a cut-off current of 0.05C at 4.5V constant voltage, and then discharged to 3V at 0.5C.
  • the initial capacity Q 0 was recorded.
  • the discharge capacity was used as the battery capacity Q 2 , and the capacity retention rate (%) was calculated.
  • the battery was fully charged again, the cell was taken out, and left to stand at room temperature for 3 hours.
  • the fully charged thickness D 2 was tested, and the thickness change rate (%) was calculated.
  • the results were recorded as shown in Table 2.
  • the calculation formula used is as follows:
  • the battery is fully charged and disassembled to determine whether its aluminum foil is corroded.
  • the thickness D 0 of the fully charged cell was tested.
  • the battery was placed in a (45 ⁇ 3)°C environment and left to stand for 3 hours.
  • the cell body reached (45 ⁇ 3)°C, the battery was charged to 4.5V at a constant current of 0.7C, and charged to a cut-off current of 0.05C at a constant voltage of 4.5V, and then discharged at 0.5C, and the initial capacity Q 0 was recorded. This cycle was repeated.
  • the discharge capacity was used as the capacity Q 3 of the battery, and the capacity retention rate (%) was calculated.
  • the battery was fully charged again, the cell was taken out, and left to stand at room temperature for 3 hours.
  • the fully charged thickness D 3 was tested at this time, and the thickness change rate (%) was calculated.
  • the results were recorded as shown in Table 2.
  • the calculation formula used is as follows:
  • the thickness D 0 of the fully charged battery cell was tested.
  • the battery was placed in a (45 ⁇ 3)°C environment and left to stand for 3 hours.
  • the battery cell reached (45 ⁇ 3)°C, the battery was charged to 4.5V at a constant current of 0.7C, and charged to a cut-off current of 0.05C at a constant voltage of 4.5V.
  • the battery was left to stand at 45°C for a certain period of time to ensure that the constant current and constant voltage charging time plus the standing time was 24H.
  • the battery was then discharged at 0.5C and the initial energy E 0 was recorded.
  • the cycle was repeated in this way.
  • the discharge energy was used as the battery energy E 1 , and the energy retention rate (%) was calculated.
  • the battery was then fully charged, the core was taken out, and left to stand at room temperature for 3 hours.
  • the fully charged thickness D 4 was tested at this time, and the thickness change rate (%) was calculated.
  • the results were recorded as shown in Table 2.
  • the calculation formula used
  • the thickness D 0 of the fully charged cell was tested.
  • the sorted battery was charged to 4.5V at 0.7C, then charged to a cut-off current of 0.05C at 4.5V constant voltage, then discharged to 3.0V at 0.5C constant current, then charged to 4.5V at 0.7C, then charged to a cut-off current of 0.05C at 4.5V constant voltage, and then placed in a 60°C environment for 35 days.
  • the fully charged thickness D 5 was tested, and the thickness change rate (%) was calculated. The results are recorded as shown in Table 2.
  • the calculation formula used is as follows:
  • Thickness change rate (%) (D 5 -D 0 )/D 0 ⁇ 100%.
  • a protective layer is coated on the surface of the aluminum foil.
  • the material forming the protective layer is shown in Table 1.
  • the thickness of the protective layer is 2 ⁇ m.
  • the preparation of the electrolyte is the same as that of Comparative Example 1, except that the amount and type of lithium salt added are different, as shown in Table 1.
  • Comparative Examples 2-4 By comparing Comparative Examples 2-4 with Comparative Example 1, it can be found that when there is no coating on the positive electrode current collector aluminum foil, when lithium bis(fluorosulfonyl)imide or lithium bis(trifluoromethylsulfonyl)imide is used as the lithium salt, there is a problem of corrosion of the aluminum foil and deterioration of the cycle performance and storage performance.
  • Example 8 By comparing Example 8 with Example 3, it can be found that appropriately increasing the content of lithium bis(fluorosulfonyl)imide has little effect on battery performance.

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Abstract

L'invention concerne une batterie haute tension, comprenant une feuille d'électrode positive, une feuille d'électrode négative, un séparateur et une solution électrolytique, la feuille d'électrode positive comprenant un collecteur de courant positif, une couche de protection et une couche de matériau actif positif ; la couche de protection est disposée sur au moins une surface latérale du collecteur de courant positif ; la solution électrolytique comprend un solvant organique et un sel de lithium, et le sel de lithium comprend du bis (fluorosulfonyl) imide de lithium et/ou du bis (trifluorométhylsulfonyl) imide de lithium. Par revêtement du collecteur de courant positif avec la couche de protection ayant une certaine épaisseur, la corrosion du bis (fluorosulfonyl) imide de lithium et/ou du bis (trifluorométhylsulfonyl) imide de lithium vers le collecteur de courant positif peut être évitée, de telle sorte que le problème d'une batterie à haute tension ayant une performance de cyclage à température normale médiocre, une performance de cyclage à haute température, une performance de stockage à haute température et une performance de cyclage d'intervalle à 45 °C est résolu.
PCT/CN2023/123455 2022-10-08 2023-10-08 Batterie haute tension Ceased WO2024074151A1 (fr)

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CN202211223494.0A CN117894993A (zh) 2022-10-08 2022-10-08 一种高电压电池
CN202211223494.0 2022-10-08

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CN119208524A (zh) * 2024-07-02 2024-12-27 宁德新能源科技有限公司 二次电池和电子设备

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CN119361988A (zh) * 2024-09-30 2025-01-24 湖北亿纬动力有限公司 一种二次电池注液方法及电解液、二次电池

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