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Lithium battery diaphragm and preparation method thereof

A lithium battery diaphragm and polycondensate technology, which is applied to battery pack components, circuits, electrical components, etc., can solve the problems of poor compatibility of the base film, affecting lithium ion transmission, and further improvement of weather resistance, achieving excellent Thermal stability, low device dependence, good wetting effect

Inactive Publication Date: 2019-03-08
孙培丽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventive method is simple and easy to implement, and the prepared lithium battery diaphragm has high ion conductivity, good thermal stability, chemical stability and electrochemical stability, and maintains high wettability and excellent However, the surface chemically modified nano-alumina dispersion coated on the surface has poor compatibility with the base film, which also affects lithium ion transmission, and its weather resistance needs to be further improved

Method used

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  • Lithium battery diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0036] A preparation method of a lithium battery diaphragm, comprising the steps of:

[0037] ⅠHydroxyl protection: Dissolve 2.51kg of dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid in N,N-dimethyl A solution was formed in 10 kg of formamide, stirred in an ice-water bath for 10 minutes, then 0.3 kg of imidazole and 1 kg of trimethylchlorosilane were added thereto, and the stirring was continued for 2 hours, after which the reaction mixture was diluted with ethyl acetate and washed 3 times with water. Then washed with saturated brine for 3 times, finally dehydrated with anhydrous magnesium sulfate, filtered, and rotary evaporated to remove the solvent to obtain an intermediate product;

[0038] Preparation of polycondensate II: 1 kg of the intermediate product prepared through step I, 1.36 kg of 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 0.4 kg of 1-hydroxybenzotriazole kg, 0.3kg of 4-dimethylaminopyridine was dissolved in 10kg of dimethyl sulfoxide t...

Embodiment 2

[0047] A preparation method of a lithium battery diaphragm, comprising the steps of:

[0048] ⅠHydroxyl protection: Dissolve 2.51kg of dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid in N,N-dimethyl A solution was formed in 12 kg of formamide, stirred in an ice-water bath for 13 minutes, then 0.35 kg of imidazole and 1 kg of trimethylchlorosilane were added thereto, and the stirring was continued for 2.3 hours. After that, the reaction mixture was diluted with ethyl acetate and washed 4 times with water. Then washed with saturated brine for 4 times, finally dehydrated with anhydrous magnesium sulfate, filtered, and rotary evaporated to remove the solvent to obtain an intermediate product;

[0049] Preparation of polycondensate II: 1 kg of the intermediate product prepared through step I, 1.36 kg of 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 0.45 kg of 1-hydroxybenzotriazole kg, 0.3kg of 4-dimethylaminopyridine was dissolved in 12kg of N,N-dimethylform...

Embodiment 3

[0058] A preparation method of a lithium battery diaphragm, comprising the steps of:

[0059] ⅠHydroxyl protection: Dissolve 2.51kg of dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid in N,N-dimethyl A solution was formed in 13 kg of formamide, stirred in an ice-water bath for 15 minutes, then 0.4 kg of imidazole and 1 kg of trimethylchlorosilane were added thereto, and the stirring was continued for 2.5 hours. After that, the reaction mixture was diluted with ethyl acetate and washed 4 times with water. Then washed with saturated brine for 4 times, finally dehydrated with anhydrous magnesium sulfate, filtered, and rotary evaporated to remove the solvent to obtain an intermediate product;

[0060] Preparation of polycondensate II: 1 kg of the intermediate product prepared through step I, 1.36 kg of 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 0.5 kg of 1-hydroxybenzotriazole kg, 0.3kg of 4-dimethylaminopyridine was dissolved in 13kg of N-methylpyrrolidon...

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Abstract

The invention discloses a preparation method of a lithium battery diaphragm. The method comprises the following steps: firstly, protecting a hydroxy of dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, then generating a polycondensation reaction with 2,2-bi[4-(4-aminophenoxy)phenyl]hexafluoropropane, performing deprotection, then performing 3-(dimethylamino) ethyl acrylate graft modification on the obtained polycondensate, uniformly mixing the polycondensate with surface-modified nano calcium carbonate and 2,7-naphthyl dithiol, obtaining a polymer film though melting and heat setting processes, and finally forming holes. The lithium battery diaphragm prepared by the above preparation method disclosed by the invention has higher lithium ion conductivity, more excellent weather resistance, thermal stability and electrochemical stability, and maintains high wettability to the electrolyte and better mechanical properties in a repeated charge and discharge process.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and relates to a lithium battery element, in particular to a lithium battery diaphragm and a preparation method thereof. Background technique [0002] Fossil resources represented by petroleum are decreasing day by day. Cars using petroleum as raw materials bring us convenience but also bring us a deteriorating environment. Human beings are sparing no effort to find clean alternative energy sources. Lithium-ion batteries can be used as clean energy in electric vehicles due to their high energy density, long cycle life, small size, and light weight. [0003] Separator is one of the important components of lithium battery. Its microporous structure, physical properties, chemical properties, thermal properties, etc. are closely related to the performance of lithium battery. Electrolyte ions pass freely to complete the electrochemical charge and discharge process. Its performance det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16C08G65/28C08G65/333H01M50/403H01M50/446
CPCC08G65/2639C08G65/33306H01M50/403H01M50/411Y02E60/10
Inventor 孙培丽
Owner 孙培丽
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