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Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof

A lithium battery diaphragm and power technology, which is applied in the field of coatings for power lithium battery diaphragms, can solve the problems of increased production costs, easy lint and powder loss of the diaphragm, etc., and achieves improved liquid absorption rate, enhanced paint leveling and water retention, Effect of improving tensile strength and cracking strength

Active Publication Date: 2013-05-29
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating provided by Evonik Degussa’s patent is easy to shed hair and powder after coating the diaphragm; while the coating provided by Xiamen University’s patent has higher requirements on the substrate, resulting in an increase in production costs

Method used

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  • Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof
  • Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof
  • Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Containing 10% chlorinated polyvinylidene fluoride, 15% glycerol, 2.5% sodium hypochlorite, 70% N,N-dimethylformamide, 2.5% nano-silicon carbide whiskers (average diameter 50nm, length-to-diameter ratio of 50) preparation method of composite coating for power lithium battery diaphragm:

[0033] 1) Dissolve 10g of chlorinated polyvinylidene fluoride into a mixture of 15g of glycerol, 2.5g of sodium hypochlorite and 70g of N,N-dimethylformamide at a dissolution temperature of 80°C to form a viscous transparent liquid;

[0034] 2) Add 2.5g of nano-silicon carbide whiskers to the viscous transparent liquid prepared in 1), and stir at high speed until it is completely homogenized and dispersed to prepare 100g of composite coating with a viscosity of 6350mPa·s.

[0035] The preparation method of the power lithium battery separator (LSEP01): the MSEP separator in Comparative Example 1 is used as the wet-laid non-woven fabric substrate, and the composite coating can be coat...

Embodiment 2

[0038] Containing 10% chlorinated polyvinylidene fluoride, 20% glycerol, 5% sodium hypochlorite, 60% N,N-dimethylformamide, 5% nano-silicon carbide whiskers (average diameter 80nm, length-to-diameter ratio of 50) preparation method of composite coating for power lithium battery diaphragm:

[0039] 1) Dissolve 10g of chlorinated polyvinylidene fluoride into a mixture of 20g of glycerol, 5g of sodium hypochlorite and 60g of N,N-dimethylformamide at a dissolution temperature of 80°C to form a viscous transparent liquid;

[0040] 2) Add 5g of nano-silicon carbide whiskers to the viscous transparent liquid prepared in 1), and stir at a high speed until it is completely homogenized and dispersed to prepare 100g of composite coating with a viscosity of 7320mPa·s.

[0041] The preparation method of the power lithium battery separator (LSEP02): the MSEP separator in Comparative Example 1 is used as the wet-laid non-woven fabric substrate, and the composite coating can be coated on ...

Embodiment 3

[0044] Containing 15% chlorinated polyvinylidene fluoride, 20% glycerol, 2.5% sodium hypochlorite, 60% N,N-dimethylformamide, 2.5% nano-silicon carbide whiskers (average diameter 100nm, aspect ratio of 30) preparation method of composite coating for power lithium battery diaphragm:

[0045] 1) Dissolve 15g of chlorinated polyvinylidene fluoride into a mixture of 20g of glycerol, 2.5g of sodium hypochlorite and 60g of N,N-dimethylformamide at a dissolution temperature of 80°C to form a viscous transparent liquid;

[0046] 2) Add 2.5g of nano-silicon carbide whiskers to the viscous transparent liquid prepared in 1), and stir at high speed until it is completely homogenized and dispersed to prepare 100g of composite coating with a viscosity of 6410mPa·s.

[0047] The preparation method of the power lithium battery separator (LSEP03): the MSEP separator in Comparative Example 1 is used as the wet-laid non-woven fabric substrate, and the composite coating can be coated on the s...

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Abstract

The invention provides a coating for a power lithium battery diaphragm, a power lithium battery diaphragm and preparation thereof. The coating for the power lithium battery diaphragm which takes wet nonwoven cloth as a base material is characterized by comprising 5-20% (wt) chlorinated polyvinylidene fluoride, 10-20% (wt) glycerol, 60-80% (wt) N, N-dimethylformamide, 2.5-5% (wt) sodium hypochlorite and 2.5-5% (wt) nano-silicon carbide whiskers. A method for preparing the coating for the power lithium battery diaphragm which takes the wet nonwoven cloth as the base material is characterized bycomprising the following specific steps of: proportionally dissolving chlorinated polyvinylidene fluoride in the mixed solution of glycerol, sodium hypochlorite and N, N-dimethylformamide to form thick transparent fluid; adding the nano-silicon carbide whiskers to the thick transparent fluid and stirring the same until the whiskers are completely homogenized and dispersed, thereby obtaining the coating for the power lithium battery diaphragm which takes the wet nonwoven cloth as the base material. The coating is capable of obviously improving the absorbency, electrical properties, high temperature shrinkage resistance and tensile strength of the power lithium battery diaphragm.

Description

technical field [0001] The invention relates to a coating for a power lithium battery diaphragm, a power lithium battery diaphragm and a preparation thereof, belonging to the technical field of lithium batteries. Background technique [0002] The power lithium battery is composed of positive / negative electrode materials, electrolyte, diaphragm and battery casing packaging materials. The separator plays a role in preventing positive / negative short circuit in the battery, and at the same time provides an ion transport channel during charging and discharging. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and safety performance of the battery. And other characteristics, the separator with excellent performance plays an important role in improving the overall performance of the battery. At present, the materials of power lithium battery separators mainly include polyolefin micropo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/256D06M11/77H01M2/16D06M101/32D06M101/02
CPCY02E60/12Y02E60/10
Inventor 贺磊吴立群杨娇
Owner CHINA HAISUM ENG
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