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High-nickel base cathode paste for lithium-ion battery and preparation method of high-nickel base cathode paste

A lithium-ion battery and cathode slurry technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor fluidity, gel, and lithium-ion battery performance effects, so as to avoid gel phenomenon and improve follow-up. performance effect

Inactive Publication Date: 2016-04-06
WANXIANG 123 CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the preparation process of the current lithium ion positive electrode slurry, gel phenomenon often occurs, causing the whole slurry to be jelly-like in whole or in part, elastic and poor in fluidity, which is not only unfavorable for the preparation of the slurry, but also affects the subsequent The performance of lithium-ion batteries has a very adverse effect on the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Each of the following servings is 100g.

[0022] A high-nickel-based positive electrode slurry for a lithium-ion battery. The positive electrode slurry includes 80 parts by weight of a high-nickel positive electrode material, 18 parts of a binder, 1 part of carbon nanofiber, 10 parts of a conductive agent, and 0.5 parts of lithium aluminum hydride. Parts, 3 parts of carboxymethyl cellulose; The chemical formula of the high-nickel positive electrode material is LiNi x m 1-x o 2 , where 0.5≤x≤1, M is Co, Mn, Al, Mg or Cr;

[0023] The binder is a modified polyvinylidene fluoride binder; the solvent is N-methylpyrrolidone, and the amount used is to make the solid content of the positive electrode slurry at 40%,

[0024] The modified polyvinylidene fluoride binder is grafted with unsaturated carboxylic acid, and the unsaturated carboxylic acid is an unsaturated carboxylic acid monomer.

[0025] The preparation method of the above-mentioned positive electrode slurry comp...

Embodiment 2

[0027] Each of the following servings is 100g.

[0028] A high-nickel-based positive electrode slurry for a lithium ion battery, the positive electrode slurry includes 98 parts by weight of a high-nickel positive electrode material, 2 parts of a binder, 10 parts of carbon nanofibers, 1 part of lithium aluminum hydride, and carboxymethyl fiber 1 part; the chemical formula of the high-nickel cathode material is LiNi x m 1-x o 2 , where 0.5≤x≤1, M is Co, Mn, Al, Mg or Cr;

[0029] The binder is a modified polyvinylidene fluoride binder; the solvent is N-methylpyrrolidone, and the amount used is such that the solid content of the positive electrode slurry is 40-70%,

[0030] The modified polyvinylidene fluoride binder is grafted with unsaturated carboxylic acid, and the unsaturated carboxylic acid is an unsaturated carboxylic acid monomer.

[0031] The preparation method of the above-mentioned positive electrode slurry comprises the following steps: first dissolving the binder...

Embodiment 3

[0033] Each of the following servings is 100g.

[0034] A high-nickel-based positive electrode slurry for a lithium ion battery, the positive electrode slurry includes 80-98 parts by weight of a high-nickel positive electrode material, 8 parts of a binder, 8 parts of carbon nanofibers, 5 parts of a conductive agent, and aluminum hydride 1 part of lithium, 1 part of carboxymethyl cellulose; the chemical formula of the high-nickel positive electrode material is LiNi x m 1-x o 2 , where 0.5≤x≤1, M is Co, Mn, Al, Mg or Cr;

[0035] The binder is a modified polyvinylidene fluoride binder; the solvent is N-methylpyrrolidone, and the amount used is such that the solid content of the positive electrode slurry is 40-70%,

[0036] The modified polyvinylidene fluoride binder is grafted with unsaturated carboxylic acid, and the unsaturated carboxylic acid is an unsaturated carboxylic acid monomer.

[0037] The preparation method of the above-mentioned positive electrode slurry compris...

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Abstract

The invention relates to the technical field of materials for lithium-ion batteries, in particular to a high-nickel base cathode paste for a lithium-ion battery and a preparation method of the high-nickel base cathode paste. The cathode paste is prepared from the following raw materials in parts by weight: 80-98 parts of a high-nickel cathode material, 2-18 parts of a binder, 1-10 parts of a carbon nanofiber and 0-10 parts of a conductive agent; a chemical formula of the high-nickel cathode material is LiNi<x>M<1-x>O<2>, wherein x is smaller than or equal to 1 and greater than or equal to 0.5; M is CO, Mn, Al, Mg or Cr; the binder is a modified polyvinylidene fluoride binder; a solvent is N-methyl pyrrolidone; and a certain amount of the solvent is used to make the solid content of the cathode paste reach 40-70%. According to the preparation of the paste, the gel phenomenon of the paste in the preparation process is avoided; and the subsequent performance of the lithium-ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a high-nickel-based cathode slurry for a lithium-ion battery and a preparation method thereof. Background technique [0002] A lithium-ion battery is a secondary battery system in which two different lithium intercalation compounds that can reversibly insert and extract lithium ions are used as the positive electrode and the negative electrode of the battery, respectively. When charging, lithium ions are extracted from the lattice of the positive electrode material, and inserted into the lattice of the negative electrode material after passing through the electrolyte, making the negative electrode rich in lithium and the positive electrode poor in lithium; during discharge, lithium ions are extracted from the lattice of the negative electrode material, and after The electrolyte is then inserted into the lattice of the positive electrode material, making the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/58
CPCY02E60/10
Inventor 周伟瑛
Owner WANXIANG 123 CO LTD
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