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Positive plate, preparation method thereof and battery

A positive electrode sheet and positive active material technology, which is applied in the field of positive electrode sheet and its preparation, can solve the problems of gas production and safety problems of high-nickel positive electrode materials, affect the performance of lithium-ion batteries, and destroy the crystal structure, so as to improve the discharge rate performance, is conducive to full wetting, and reduces the effect of corrosion

Active Publication Date: 2019-07-09
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas production and safety problems of high-nickel cathode materials are prominent during use, which limits their application.
In particular, during the use of lithium-ion batteries, due to the accumulation of side reactions of the electrolyte on the surface of the positive electrode material, the crystal structure of the positive electrode material will be severely damaged, which will seriously affect the performance of the lithium-ion battery.

Method used

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  • Positive plate, preparation method thereof and battery
  • Positive plate, preparation method thereof and battery
  • Positive plate, preparation method thereof and battery

Examples

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preparation example Construction

[0012] First, the preparation method of the positive electrode sheet according to the first aspect of the present invention is described, which includes the step: S1, coating the slurry containing the positive electrode active material, the conductive agent, and the binder on the current collector, and after drying, the initial positive electrode sheet is obtained ; S2, mix polymerizable substances, additives and low-boiling point solvents uniformly to prepare a coating solution, then apply the coating solution to the surface of the initial positive electrode sheet, dry and remove the low-boiling point solvent to form a coating; S3, the initial positive electrode The sheet is left to stand in the air for a period of time, and then further heated and baked to remove the additives in the coating to form a porous structure in the coating to complete the preparation of the positive electrode sheet. Wherein, the polymerizable substance is a substance that can spontaneously polymeriz...

Embodiment 1

[0056] Prepare lithium-ion battery according to the same method as Comparative Example 1, the difference is:

[0057] (1) Preparation of positive electrode sheet:

[0058] The cathode active material LiNi 0.8 mn 0.1 co 0.1 o 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride are mixed in the N-methylpyrrolidone solvent system according to the mass ratio of 94:3:3, and then coated on the current collector Al foil, dried and cooled. Press to obtain the initial positive electrode sheet.

[0059] Sodium silicate and glycerol were dissolved in deionized water to prepare a coating solution with a mass fraction of 30%, wherein the mass ratio of sodium silicate to glycerol was 70%:30%. Coating the coating solution on the surface of the initial positive electrode sheet, after the coating is completed, drying and removing water at 60°C to 80°C, and then leaving the initial positive electrode sheet in a high-humidity environment (air humidity greater th...

Embodiment 2

[0061] Prepare lithium-ion battery according to the same method as Comparative Example 1, the difference is:

[0062] (1) Preparation of positive electrode sheet:

[0063] The cathode active material LiNi 0.8 mn 0.1 co 0.1 o 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride are mixed in the N-methylpyrrolidone solvent system according to the mass ratio of 94:3:3, and then coated on the current collector Al foil, dried and cooled. Press to obtain the initial positive electrode sheet.

[0064] Potassium phosphate and glycerol were dissolved in deionized water to prepare a coating solution with a mass fraction of 30%, wherein the mass ratio of potassium phosphate to glycerol was 70%:30%. Coating the coating solution on the surface of the initial positive electrode sheet, after the coating is completed, drying and removing water at 60°C to 80°C, and then leaving the initial positive electrode sheet in a high-humidity environment (air humidity grea...

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Abstract

The invention provides a positive plate, a preparation method thereof and a battery. The preparation method of the positive plate comprises the steps that a current collector is coated with paste which contains a positive active material, a conductive agent and a binder, and an initial positive plate is obtained after drying; a polymerizable substance, an additive and a low-boiling-point solvent are mixed uniformly and prepared into a coating solution, then the coating solution is spread on the surface of the initial positive plate, the low-boiling-point solvent is removed through drying, anda coating is formed; and the initial positive plate stands in the air for a period of time and then is further heated and roasted to remove the additive in the coating, so that a porous structure is formed in the coating, and preparation of the positive plate is completed. Through the positive plate and the preparation method thereof, the safety of the battery and storage of generated gases can beeffectively improved, and meanwhile the battery has good rate capability and circulation performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a positive electrode sheet, a preparation method thereof, and a battery. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, computers, electric bicycles and electric vehicles due to their advantages such as high capacity, long cycle life, no memory effect, less self-discharge, wide operating temperature range, and good rate performance. [0003] High-nickel cathode materials have the advantages of high capacity, good cycle performance, and good rate capability, and are receiving more and more attention. However, the gas production and safety problems of high-nickel cathode materials are prominent during use, which limits their application. In particular, during the use of lithium-ion batteries, due to the accumulation of side reactions of the electrolyte on the surface of the positive-electrode material, the crystal structure of the positive-electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M4/04H01M10/0525
CPCH01M4/0404H01M4/0471H01M4/131H01M4/1391H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 郑义王龙钟泽朱钟泗陶尧
Owner CONTEMPORARY AMPEREX TECH CO
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