Preparation method of positive electrode slice of high voltage solid density high energy density lithium ion battery

A lithium-ion battery and positive pole piece technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of poor conductivity of positive and negative active materials, difficulty in infiltration of electrolyte, affecting battery rate performance, long cycle, etc. problems, achieve superior performance, improve electrical conductivity, excellent electronic conductivity and ionic conductivity

Inactive Publication Date: 2017-08-18
上海汇平新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, improving the high energy density of the battery is mainly achieved by increasing the compacted density and gram capacity of the material. The increase in the compacted density can significantly increase the volumetric energy density of

Method used

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  • Preparation method of positive electrode slice of high voltage solid density high energy density lithium ion battery
  • Preparation method of positive electrode slice of high voltage solid density high energy density lithium ion battery
  • Preparation method of positive electrode slice of high voltage solid density high energy density lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0021] This embodiment involves lithium cobaltate (LiCoO 2 ) is positive electrode active material, prepares positive electrode material and corresponding battery, specifically comprises the following steps:

[0022] a. Weigh 97.7 parts by weight of LiCoO 2 , 1 part by weight of Super-P (conductive carbon black), 1.3 parts by weight of PVDF, mixed and stirred evenly;

[0023] b. Weigh 0.2 parts by weight of fluorocarbon surfactant (Shanghai Huiping New Energy Co., Ltd. WA1600) into the N-methyl-2-pyrrolidone solution and mix evenly, add it to the above-mentioned positive electrode material, and stir for 1 to 5 hours to obtain Positive electrode slurry;

[0024] c, coating the positive electrode slurry on the positive electrode current collector, and drying to obtain the positive electrode sheet;

[0025] d. Roll the pole piece to 4.3g / cm 3 After the compaction density, the strips were assembled into lithium-ion batteries, and the electrochemical performance tests were carr...

Embodiment 2

[0027] This embodiment involves lithium cobaltate (LiCoO 2 ) is positive electrode active material, prepares positive electrode material and corresponding battery, specifically comprises the following steps:

[0028] a. Weigh 97.7 parts by weight of LiCoO 2 , 1 part by weight of porous carbon conductive agent (Heraeus Lion), 1.3 parts by weight of PVDF, mixed and stirred;

[0029] b. Add an appropriate amount of N-methyl-2-pyrrolidone solution to the above positive electrode material, and stir for 1 to 5 hours to obtain a slurry;

[0030] c, coating the positive electrode slurry on the positive electrode current collector, and drying to obtain the positive electrode sheet;

[0031] d. Roll the pole piece to 4.3g / cm 3 After the compaction density, the strips were assembled into lithium-ion batteries, and the electrochemical performance tests were carried out.

Embodiment 3

[0033] This embodiment involves lithium cobaltate (LiCoO 2 ) is positive electrode active material, prepares positive electrode material and corresponding battery, specifically comprises the following steps:

[0034] a. Weigh 97.7 parts by weight of LiCoO 2 , 1 part by weight of porous carbon conductive agent (Heraeus Lion), 1.3 parts by weight of PVDF, mixed and stirred;

[0035] b. Weigh 0.2 parts by weight of fluorocarbon surfactant (Shanghai Huiping New Energy Co., Ltd. WA1600) into the N-methyl-2-pyrrolidone solution and mix evenly, add it to the above-mentioned positive electrode material, and stir for 1 to 5 hours to obtain slurry;

[0036] c, coating the positive electrode slurry on the positive electrode current collector, and drying to obtain the positive electrode sheet;

[0037] d. Roll the pole piece to 4.3g / cm 3 After the compaction density, the strips were assembled into lithium-ion batteries, and the electrochemical performance tests were carried out.

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Abstract

The invention relates to an anode paste of lithium ion battery and a positive plate, a lithium ion battery of the positive slurry, therein the positive slurry includes positive electrode active material, positive electrode binder, positive conductive agent and positive additive. The positive conductive agent is porous carbon conductive agent. The positive additive is fluorocarbon surfactant. Related to existing technology, the porous carbon conductive agent of this preparation method has excellent electronic conductivity and ionic conductivity, which internal resistance of the battery can be greatly reduced and the power and magnification performance of high voltage solid density cell will be improved. Further, fluorocarbon surfactant effectively reduces the surface tension of the positive paste, improves the effect that the positive slurry is wetted, flat and coated on the surface of the positive collector and enhances the absorption and preservation of electrolyte to positive plate. The use of porous carbon conductive agent and fluorocarbon surfactant can obviously improve the conductivity of the positive electrode of high voltage solid density, and obtain a high-performance energy density battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive electrode slurry with high compaction and high energy density, a positive electrode sheet including the positive electrode slurry, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of small self-discharge, high specific energy, long cycle life, environmental protection and pollution-free, and are increasingly widely used in portable electronic products, electric vehicles, reserve power supplies, and aviation fields. With the rapid development of science and technology in various industries, higher and higher requirements are put forward for the energy density, rate performance and cycle performance of lithium-ion secondary batteries. At present, improving the high energy density of the battery is mainly achieved by increasing the compacted density and gram capacity of the material. The increase in the compacted density...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M4/62H01M10/0525
CPCH01M4/0404H01M4/139H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 龚雪梅陈湘宁
Owner 上海汇平新能源有限公司
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