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Diaphragm coating slurry capable of improving safety performance of lithium ion battery and preparation method of diaphragm coating slurry

A lithium-ion battery, safety performance technology, applied in the direction of secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve the problems of large thickness and area density, inability to be widely used, poor heat resistance, etc., to achieve The effect of small amount of raw materials, improved processing efficiency and quality, and low cost

Inactive Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the type of separator used is usually porous polyolefin material, which is widely used due to its excellent electrochemical stability, but its heat resistance is poor. When the battery temperature reaches the fusing temperature of the separator, the separator will be fused, and the positive and negative electrodes direct contact will cause an internal short circuit
Compared with polyolefin separators, inorganic ceramic coating separators have higher heat resistance and better electrolyte wetting performance. In recent years, they have been widely used in lithium-ion batteries. However, with the improvement of battery energy density and safety With the gradual improvement of performance requirements, ordinary ceramic separators can no longer meet the requirements of battery performance. Some higher-performance functional materials such as PET and PI separators cannot be widely used temporarily due to their large thickness and surface density, low strength, and high cost. , there is an urgent need to develop a separator whose comprehensive performance and application cost can meet the requirements of battery indicators, can achieve large-scale production, and can improve the safety performance of batteries to a certain extent.

Method used

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  • Diaphragm coating slurry capable of improving safety performance of lithium ion battery and preparation method of diaphragm coating slurry
  • Diaphragm coating slurry capable of improving safety performance of lithium ion battery and preparation method of diaphragm coating slurry
  • Diaphragm coating slurry capable of improving safety performance of lithium ion battery and preparation method of diaphragm coating slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A diaphragm coating slurry capable of improving the safety performance of lithium-ion batteries, comprising the following raw materials in parts by weight: 20 parts of inorganic insulators, 0.5 parts of ammonium polyacrylate, 3 parts of binders, polyether modified silicone surfactants 0.5 parts, 76 parts of water;

[0028] Among them, the inorganic insulator is flaky aluminum oxide powder with a particle size D50 of 5-8 μm and a thickness of 0.5-1.0 μm; the binder is a modified water-based acrylic resin with a glass transition temperature of 150° C.

[0029] Preparation of Separator Coating Slurry for Improved Safety Performance of Li-ion Batteries:

[0030] S1. After mixing inorganic insulator, ammonium polyacrylate and water, ultrasonically disperse, the dispersing power is 2000W, the dispersing temperature is 25℃, and the dispersing time is 1.5h;

[0031] S2. Add the binder and polyether-modified silicone surfactant into the dispersion liquid for ultrasonic dispersi...

Embodiment 2

[0034] A separator coating slurry capable of improving the safety performance of lithium-ion batteries, comprising the following raw materials in parts by weight: 35 parts of inorganic insulators, 2 parts of polyvinylpyrrolidone, 5 parts of binders, 1 part of anionic fluorocarbon surfactants, 57 parts of water;

[0035] Among them, the inorganic insulator is flaky aluminum oxide powder with a particle size D50 of 5-8 μm and a thickness of 0.5-1.0 μm; the binder is a modified water-based acrylic resin with a glass transition temperature of 140° C.

[0036] Preparation of Separator Coating Slurry for Improved Safety Performance of Li-ion Batteries:

[0037] S1. Mix the inorganic insulator, polyvinylpyrrolidone and water and then ultrasonically disperse. The dispersing power is 2500W, the dispersing temperature is 30℃, and the dispersing time is 1h;

[0038] S2. Add the binder and anionic fluorocarbon surfactant into the dispersion liquid for ultrasonic dispersion, the dispersio...

Embodiment 3

[0041] A separator coating slurry capable of improving the safety performance of lithium-ion batteries, comprising the following raw materials in parts by weight: 30 parts of inorganic insulators, 0.2 parts of polyvinyl alcohol, 4 parts of binders, 0.1 parts of anionic fluorocarbon surfactants, 50 parts of water;

[0042] Among them, the inorganic insulator is flaky aluminum oxide powder with a particle size D50 of 5-8 μm and a thickness of 0.5-1.0 μm; the binder is a modified water-based acrylic resin with a glass transition temperature of 160° C.

[0043] Preparation of Separator Coating Slurry for Improved Safety Performance of Li-ion Batteries:

[0044] S1. After mixing inorganic insulator, polyvinyl alcohol and water, ultrasonically disperse, the dispersion power is 3000W, the dispersion temperature is 28°C, and the dispersion time is 3h;

[0045] S2. Add binder and anionic fluorocarbon surfactant to the dispersion liquid for ultrasonic dispersion, the dispersion tempera...

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Abstract

The invention discloses diaphragm coating slurry capable of improving the safety performance of a lithium ion battery. The diaphragm coating slurry comprises the following raw materials in parts by weight: 20-35 parts of an inorganic insulator, 0.2-3 parts of a dispersing agent, 3-5 parts of a binder, 0.1-2 parts of a surfactant and 50-80 parts of water. The invention also discloses a preparationmethod of the diaphragm coating slurry capable of improving the safety performance of the lithium ion battery, and the lithium ion battery diaphragm prepared from the diaphragm coating slurry. The coating formed by the diaphragm coating slurry on the surface of the diaphragm can effectively maintain the pore structure in the diaphragm after impact, and ensures that the battery has more uniform lithium ion flow in the charge-discharge process, thereby enhancing the safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a diaphragm coating slurry capable of improving the safety performance of lithium ion batteries and a preparation method thereof. Background technique [0002] The separator is one of the important components of the lithium-ion battery. The performance of the separator will directly affect the capacity, internal resistance, rate, cycle and self-discharge of the battery, especially the safety performance of the battery. At present, the type of separator used is usually porous polyolefin material, which is widely used due to its excellent electrochemical stability, but its heat resistance is poor. When the battery temperature reaches the fusing temperature of the separator, the separator will be fused, and the positive and negative electrodes There will be direct contact and an internal short circuit will occur. Compared with polyolefin separators, inorganic ceramic ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 陈萌彭康杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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