Waterborne slurry used for coating lithium ion battery diaphragm and preparation method for waterborne slurry

A technology of lithium-ion batteries and water-based slurry, which is applied to battery pack components, separators/films/diaphragms/spacers, circuits, etc. Poor heat resistance and other problems, to achieve the effect of good coating performance, strong repeatability and strong processability

Inactive Publication Date: 2017-08-01
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 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 contact and produce an internal short circuit.
Although there is a multi-layer composite diaphragm with higher safety, it still cannot meet the safety requirements of the power battery for the diaphragm

Method used

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  • Waterborne slurry used for coating lithium ion battery diaphragm and preparation method for waterborne slurry
  • Waterborne slurry used for coating lithium ion battery diaphragm and preparation method for waterborne slurry
  • Waterborne slurry used for coating lithium ion battery diaphragm and preparation method for waterborne slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 30 parts of aluminum oxide, 0.4 parts of polyacrylic acid ammonium salt copolymerization solution, 0.1 part of synthetic phyllosilicate solution and 40 parts of deionized water into the disperser, control the temperature of the disperser to 25°C, and the power to 2000W. Disperse for 1.5 hours, then add 3 parts of water-based polypropionic acid modified resin, 26 parts of glue dispersion, and 0.5 parts of polyether modified silicone surfactant to the disperser, keep the temperature of the disperser at 25°C and the power at 400W , and continue to disperse for 1 hour to pass through a 200-mesh sieve to obtain a slurry. Use a coating machine to evenly coat the slurry on the surface of the PE base film, and then dry it to obtain a new type of coated separator for lithium-ion batteries. The speed of the coating machine is controlled at 50 m / min, and the oven temperature is 65°C.

Embodiment 2

[0028] Add 28 parts of boehmite, 1 part of polyvinylpyrrolidone solution, 0.6 part of sodium hydroxymethylcellulose solution and 40 parts of deionized water into the disperser, control the temperature of the disperser at 30°C, and the power of 2500W, and disperse for 1 hour , then add 5 parts of water-based polyvinyl alcohol, 25 parts of glue dispersion, 0.4 parts of water-based non-ionic fluorocarbon surfactant, keep the temperature of the disperser at 30°C, and the power of 500W, and continue to disperse for 0.5 hours to pass through a 200-mesh screen , get slurry. Use a coating machine to evenly coat the slurry on the surface of the PP base film, and then dry it to obtain a new type of coated separator for lithium-ion batteries. The speed of the coating machine is controlled at 40 m / min, and the oven temperature is 60 °C.

Embodiment 3

[0030] Add 26 parts of boron nitride, 1 part of polyvinyl alcohol solution, 0.4 part of synthetic layered silicate solution and 42 parts of deionized water into the disperser, control the temperature of the disperser at 35°C, and the power of 2200W, and disperse for 1.2 hours , then add 10 parts of water-based acrylonitrile, 30 parts of glue dispersion, and 0.6 parts of water-based anionic fluorocarbon surfactant, keep the temperature of the disperser at 35°C, and the power of 600W, and continue to disperse for 0.4 hours to pass through a 200-mesh screen to obtain slurry. Use a coating machine to evenly coat the slurry on the surface of the PE base film, and then dry it to obtain a new type of coated separator for lithium-ion batteries. The speed of the coating machine is controlled at 45 m / min, and the oven temperature is 65 °C.

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Abstract

The invention provides waterborne slurry used for coating a lithium ion battery diaphragm and a preparation method for the waterborne slurry. The waterborne slurry is prepared from the components of 20-35 parts of inorganic ceramic powder, 0.2-3 parts of dispersing agent, 2-10 parts of binder, 20-50 parts of adhesive dispersion liquid, 0.3-2 parts of surfactant, 0.1-2 parts of anti-settling agent and 30-60 parts of deionized water. The preparation method comprises the steps of adding the inorganic ceramic powder, the dispersing agent, the anti-settling agent and the deionized water into a dispersing machine based on proportion to be subjected to high-speed dispersion for 1-3h, and then adding the binder, the adhesive dispersion liquid and the surfactant to be subjected to low-speed dispersion for 0.5-2h and then enabling the obtained mixture to be sieved by a 200-mesh screen to obtain slurry; and finally uniformly coating the surface of a base diaphragm of the diaphragm with the slurry by using a coating machine, and drying the diaphragm. The waterborne slurry can be manufactured favorably, and also has the dual advantages of reduction of thermal shrinkage by virtue of the ceramic diaphragm, improvement of electrolyte wettability, and improvement of lithium ion battery interface and cycling performance due to the gummed diaphragm, and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a new material for lithium-ion battery separators and a preparation method thereof. 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 contact, resulting in an internal short c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/446
CPCH01M50/403H01M50/409Y02E60/10
Inventor 陈萌张江伟宜杰杨亚冬
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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