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Positive electrode of safe lithium-ion power battery and lithium-ion battery comprising positive electrode

A power battery, lithium ion technology, applied in battery electrodes, electrode collector coatings, secondary batteries, etc., can solve the problem of poor electrochemical performance and stability of batteries, affecting battery quality and service life, and thermal shrinkage of ceramic diaphragms High problems, achieve good liquid absorption and liquid retention rate, reduce the probability of thermal runaway, and narrow particle size distribution.

Active Publication Date: 2016-04-06
WANXIANG 123 CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of ceramic coatings increases the internal resistance of lithium-ion batteries and deteriorates the electrochemical performance of the batteries, thereby affecting the quality and service life of the batteries.
Patent CN101989651A discloses a cross-linked ceramic coating diaphragm containing ionic polymers, which is prepared by mixing ionic polymers, ceramic particles, functional inorganic compounds, curing agents, and initiators, and coating on one side or both sides of the base film. On the other hand, after drying, the diaphragm obtained by thermal polymerization or chemical crosslinking by ultraviolet radiation, although the diaphragm reduces the internal resistance to a certain extent, but the thermal shrinkage rate of the ceramic diaphragm is relatively high, and the thermal stability is poor, resulting in The electrochemical performance and stability of the battery are poor

Method used

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  • Positive electrode of safe lithium-ion power battery and lithium-ion battery comprising positive electrode
  • Positive electrode of safe lithium-ion power battery and lithium-ion battery comprising positive electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Preparation of ceramic slurry: Weigh 40 parts by weight of boehmite, 8 parts by weight of polyvinylidene fluoride, 2 parts by weight of polyvinylpyrrolidone, and 50 parts by weight of nitrogen methyl pyrrolidone, add them successively, adopt high-speed dispersion, stir for 6 Hours to mix the slurry evenly. Wherein, the particle size range of the inorganic ceramic particles is 0.5 μm≤D50≤1 μm.

[0051] Preparation of positive electrode sheet: Mix nickel-cobalt-manganese ternary material, conductive agent, and binder, add solvent and stir to form a slurry, and evenly coat it on the aluminum foil of the positive electrode collector. After drying, it is rolled with a rolling machine to make a positive electrode sheet. Then, the ceramic slurry in the previous step was evenly coated on the positive electrode sheet, and the coating thickness was 4 μm on both sides. And place the pole piece in a vacuum oven to dry at a temperature of 110 degrees centigrade for 10 hours.

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Embodiment 2

[0058] Preparation of ceramic slurry: Weigh 38 parts by weight of diaspore, 8 parts by weight of styrene-butadiene rubber, 2 parts by weight of carboxymethyl cellulose, 2 parts by weight of polyvinylpyrrolidone, and 50 parts by weight of deionized water, add successively , take high-speed dispersion and stir for 6 hours to make the slurry evenly mixed. The particle size range of the inorganic ceramic particles is 0.3 μm≤D50≤0.8 μm.

[0059] Preparation of positive electrode sheet: Mix nickel-cobalt-manganese ternary material, conductive agent, and binder, add solvent and stir to form a slurry, and evenly coat it on the aluminum foil of the positive electrode collector. After drying, it is rolled with a rolling machine to make a positive electrode sheet. Then, the ceramic slurry in the previous step was evenly coated on the positive pole piece, one side was coated, and the coating thickness was 6 μm. And place the pole piece in a vacuum oven to dry at a temperature of 90 degr...

Embodiment 3

[0074] Prepare ceramic slurry: weigh 20 parts by weight of boehmite, 20 parts by weight of diaspore, 8 parts by weight of polyvinylidene fluoride, 2 parts by weight of polyvinylpyrrolidone, and 50 parts by weight of nitrogen methyl pyrrolidone, successively Add, disperse at high speed, and stir for 6 hours to make the slurry evenly mixed. The particle size range of the inorganic ceramic particles is 0.1 μm≤D50≤0.5 μm.

[0075] Preparation of positive electrode sheet: Mix nickel-cobalt-manganese ternary material, conductive agent, and binder, add solvent and stir to form a slurry, and evenly coat it on the aluminum foil of the positive electrode collector. After drying, it is rolled with a rolling machine to make a positive electrode sheet. Then, the ceramic slurry in the previous step was evenly coated on the positive electrode sheet, and the coating was applied on both sides, and the coating thickness on each side was 8 μm. And place the pole piece in a vacuum oven to dry a...

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Abstract

The invention relates to the field of lithium-ion batteries, and discloses a positive electrode of a safe lithium-ion power battery and the lithium-ion battery comprising the positive electrode. The positive electrode of the battery comprises a positive current collector, a positive active material and ceramic slurry, wherein the ceramic slurry coats the surface of the positive active material and is an oil system or a water system; the oil ceramic slurry comprises the following components in percentage by weight: 35wt%-45wt% of inorganic ceramic particles, 6wt%-10wt% of polyvinylidene fluoride, 1wt%-3wt% of polyvinylpyrrolidone and 45wt%-55wt% of 1-methyl-2-pyrrolidinone; and the water ceramic slurry comprises the following components in percentage by weight: 35wt%-40wt% of inorganic ceramic particles, 6wt%-10wt% of butadiene styrene rubber, 1wt%-3wt% of carboxymethylcellulose, 1wt%-3wt% of polyvinylpyrrolidone and 45wt%-55wt% of deionized water; and the inorganic ceramic particles comprise one or more of boehmite and diaspore. The ceramic slurry coats the surface of the positive active material, so that the safety performance of the battery is improved; meanwhile, the influence on the electrochemical properties of the battery is extremely small; and the stability is good.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a positive electrode of a safe lithium ion power battery and a lithium ion battery containing the positive electrode. Background technique [0002] The development of new materials and the development of renewable energy technologies have become one of the major issues to be solved by mankind in the 21st century. The chemical power source as an energy storage and conversion device is an important means to effectively utilize energy. At present, lithium-ion batteries and fuel cells are research hotspots in the field of chemical power sources, especially as power batteries, which are of great significance to environmental protection and social development. Lithium-ion batteries have attracted widespread attention from all over the world due to their high operating voltage, high energy density, low self-discharge rate, and environmental friendliness. [0003] However, with the...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M10/0525
CPCH01M4/0404H01M4/62H01M10/0525Y02E60/10
Inventor 彭波殷月辉吕豪杰
Owner WANXIANG 123 CO LTD
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