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Ceramic slurry for coating lithium ion battery separator and preparation method of separator containing ceramic slurry

A lithium-ion battery, ceramic slurry technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of high water content of ceramic separators, high storage conditions, and long baking process cycles, and achieve shortened Baking time, simple mixing process, and the effect of improving battery cycle performance

Inactive Publication Date: 2017-11-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic slurry currently on the market is relatively hard, and the processing roller is greatly worn during coating, and the coated ceramic diaphragm has a large water content and is easy to absorb water, which requires high storage conditions. The baking process cycle is long in the process

Method used

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  • Ceramic slurry for coating lithium ion battery separator and preparation method of separator containing ceramic slurry
  • Ceramic slurry for coating lithium ion battery separator and preparation method of separator containing ceramic slurry
  • Ceramic slurry for coating lithium ion battery separator and preparation method of separator containing ceramic slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 20 parts of boehmite, 0.2 parts of polyacrylic acid ammonium salt copolymer solution, 0.5 parts of synthetic layered silicate solution and 60 parts of deionized water into the disperser, control the temperature of the disperser to 25°C, and the power to 1800W. After 3 hours, add 10 parts of water-based polypropionic acid modified resin to the disperser, 0.3 part of polyether modified silicone surfactant, keep the temperature of the disperser at 25°C, and the power at 600W, and continue to disperse for 1 hour. A 200-mesh sieve was used to obtain a ceramic slurry. Use a coating machine to control the coating thickness to 4 μm, evenly coat the slurry on the surface of the PE base film, and then dry it to obtain a lithium-ion battery separator. Control the speed of the coating machine to 40 m / min, and the oven temperature to 65 °C .

Embodiment 2

[0030] Add 32 parts of boehmite, 3 parts of polyvinyl alcohol solution, 0.3 parts of hydroxymethylcellulose sodium solution and 70 parts of deionized water into the disperser, control the temperature of the disperser at 20°C, and the power of 2000W, and disperse for 4 hours , then add 13 parts of water-based acrylonitrile multi-polymer copolymer, 1 part of water-based non-ionic fluorocarbon surfactant, keep the temperature of the disperser at 20°C, and the power of 500W, continue to disperse for 2 hours and pass through a 200-mesh screen to obtain a ceramic slurry material. Use a coating machine to control the coating thickness to 2 μm, evenly coat the ceramic slurry on the surface of the PP / PE base film, and then dry it to obtain a lithium-ion battery separator. Control the speed of the coating machine to 15 m / min, and the oven temperature is 60°C.

Embodiment 3

[0032] Add 35 parts of boehmite, 3 parts of polyvinylpyrrolidone solution, 2 parts of sodium hydroxymethylcellulose solution and 90 parts of deionized water into the disperser, control the temperature of the disperser at 30°C, and the power of 1500W, and disperse for 5 hours , and then add 15 parts of water-based polyvinyl alcohol, 2 parts of water-based nonionic fluorocarbon surfactant, keep the temperature of the disperser at 30°C, and the power of 300W, and continue to disperse for 3 hours through a 200-mesh sieve to obtain a ceramic slurry. Use a coating machine to control the coating thickness to 1 μm, evenly coat the ceramic slurry on the surface of the PP base film, and then dry it to obtain a lithium-ion battery ceramic diaphragm. Control the speed of the coating machine to 60 m / min, and the oven temperature is 75°C.

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Abstract

The invention discloses ceramic slurry for coating a lithium ion battery separator and a preparation method of the separator containing the ceramic slurry. The ceramic slurry is prepared from 20 to 35 parts of an inorganic insulator, 0.2 to 3 parts of a dispersant, 10 to 15 parts of a binder, 0.3 to 2 parts of a surfactant, 0.3 to 2 parts of an anti-settling agent and 60 to 90 parts of deionized water. The preparation method is as follow: first adding the inorganic insulator, the dispersant, the anti-settling agent and the deionized water according to the ratio into a dispersion machine for high-speed dispersion for 3 to 5 hours, then adding the binder and the surfactant for dispersing at a low speed for 1-3 hours, sieving with a 200 mesh sieve to obtain the ceramic slurry, finally using a coating machine to evenly coat the surface of a separator base membrane with the ceramic slurry, and drying to obtain the ceramic separator. The ceramic slurry has the advantages of simple slurry mixing process and small hardness, and is beneficial to coating processing. Meanwhile, the coated ceramic separator has the advantages of low moisture content, facilitation in battery processing, reduction of thermal shrinkage of the separator base membrane, improvement of electrolyte wettability and improvement of battery cycle performance and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a preparation method of a ceramic slurry used for coating a diaphragm of a lithium ion battery and a diaphragm containing the slurry. Background technique [0002] In lithium batteries, the main function of the separator is to keep the positive and negative electrodes separated to prevent short circuits, while allowing the rapid transfer of ions, which is a more important component in lithium-ion batteries. The performance of the separator will directly affect the characteristics of the battery, such as the capacity, internal resistance, rate, cycle and self-discharge of the battery. At present, the material of lithium-ion battery diaphragm is usually polyolefin material, which has poor heat resistance. When the battery temperature reaches the fusing temperature of the diaphragm, the diaphragm will be fused, and the positive and negative electrodes will directly con...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/434H01M50/446H01M50/449H01M50/489
CPCH01M50/403H01M50/431Y02E60/10
Inventor 陈萌杨亚冬代北北张壁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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