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Fabrication method of super-hydrophobic/super-hydrophilic electrolyte lithium battery separator

A lithium battery separator and electrophile technology, applied in the field of lithium battery applications, can solve problems such as blanks, and achieve the effects of high liquid absorption rate, high retention rate, and low moisture regain.

Inactive Publication Date: 2019-05-17
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The survey found that there is still a gap in the patented technology of super-hydrophobic / super-electrophilic lithium battery separators

Method used

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  • Fabrication method of super-hydrophobic/super-hydrophilic electrolyte lithium battery separator
  • Fabrication method of super-hydrophobic/super-hydrophilic electrolyte lithium battery separator
  • Fabrication method of super-hydrophobic/super-hydrophilic electrolyte lithium battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Weigh 0.5 g of attapulgite nanoparticles into a 100 mL Erlenmeyer flask, then measure 40 mL of ethanol, 2 mL of ammonia water and 4 mL of deionized water, stir magnetically for 10 min, and ultrasonicate for 30 min in a water bath. After that, 0.1 mL tetraethoxysilane and 0.6 mL methyltriethoxysilane were added to the Erlenmeyer flask, stirred and reacted at room temperature for 24 h to obtain a homogeneous suspension of organosilane polymer / attapulgite composite . Subsequently, the precipitate was collected by centrifugation at 8000 r / min for 10 min, and dried at 80 °C for 24 h to obtain superhydrophobic attapulgite nanoparticles.

[0037] (2) Weigh 0.8 g superhydrophobic attapulgite nanoparticles and 0.2 g Super P, mix and grind for 60 min to obtain superhydrophobic attapulgite / Super P mixed powder; weigh 0.2 g polytetrafluoroethylene and disperse in 80 mL N -Methyl-2-pyrrolidone; superhydrophobic attapulgite / Super P mixed powder was added to the binder dispersio...

Embodiment 2

[0043] (1) Weigh 0.75 g of alumina nanoparticles into a 100 mL Erlenmeyer flask, then measure 80 mL of ethanol, 2 mL of acetic acid and 14 mL of deionized water, stir magnetically for 10 min, and ultrasonicate for 20 min. After that, 0.5 mL of ethyltriethoxysilane, 7.1 mL of aminopropyltrimethoxysilane and 1.2 mL of ethyl orthosilicate were added to the Erlenmeyer flask, and the reaction was stirred at room temperature for 24 h to obtain uniform organosilane polymerization. compound / alumina composite suspension. Subsequently, the precipitate was collected by centrifugation at 10000 r / min for 5 min, and dried at 80 °C for 24 h to obtain superhydrophobic alumina nanoparticles.

[0044] (2) Weigh 0.1 g superhydrophobic alumina nanoparticles and 0.05 g graphite respectively, mix and ball mill for 100 min to obtain superhydrophobic alumina / graphite mixed powder. Weigh 0.02 g polyvinylidene fluoride and disperse in 20 mL N,N - in dimethylformamide; superhydrophobic alumina nanopar...

Embodiment 3

[0049] (1) Weigh 0.1 g of carbon nanotubes into a 500 mL round bottom flask, then measure 180 mL of ethylene glycol, 1 mL of hydrochloric acid and 14 mL of deionized water, stir magnetically for 10 min, and ultrasonicate for 30 min. Then measure 5 mL of ethyltriethoxysilane, 5 mL of methyltriethoxysilane, 2.0 mL of ethyl orthosilicate and 9 mL of dodecyltrimethoxysilane into a round bottom flask, 50 The reaction was stirred at °C for 10 h to obtain an organosilane polymer / carbon nanotube composite gel. Subsequently, it was dried at 100 °C for 24 h to obtain superhydrophobic carbon nanotubes.

[0050] (2) Weigh 0.048 g superhydrophobic carbon nanotubes and 0.016 g acetylene black respectively, mix and ball mill for 20 min to obtain superhydrophobic carbon nanotubes / acetylene black mixed powder. Weigh 0.002 g of polyethylene oxide and disperse it in 40 mL of acetonitrile; add superhydrophobic carbon nanotubes / acetylene black mixed powder into the binder dispersion, then magneti...

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Abstract

The invention discloses a method for fabricating a super-hydrophobic / super-hydrophilic electrolyte lithium battery separator. The method comprises the steps of dispersing nanoparticle and organic silane in an alcohol-water mixed system with ultrasound, and adding an acid or an alkali as a catalyst so that the nanoparticle and the organic silane generate hydrolytic condensation reaction to obtain an organic silane polymer / nanoparticle composite suspension liquid; centrifugally collecting a precipitant, and performing drying to obtain super-hydrophobic nanoparticle; adding the super-hydrophobic,a conductive carbon material and a binding agent into a dispersing agent after the super-hydrophobic and the conductive carbon material are mixed and grinded, and performing stirring and ultrasound to obtain uniform paste; and finally, spraying the paste onto a surface of a lithium battery substrate separator, and performing hot-curing to obtain the super-hydrophobic / super-hydrophilic electrolytelithium battery separator after drying. Bionic superinfiltration expression is initially introduced into the design of the lithium battery separator, the prepared super-hydrophobic / super-hydrophilicelectrolyte lithium battery separator has excellent electrolyte wettabiity, high liquid absorption rate, retention rate and extremely low moisture regain rate, and the comprehensive performance of thelithium battery is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery separator, in particular to a preparation of a high-performance superhydrophobic / super-electrophilic electrolyte lithium battery separator, belonging to the technical field of lithium battery applications. Background technique [0002] As one of the key inner components of the lithium battery, the battery separator has the following main functions: (1) to isolate the positive and negative electrodes, to prevent direct contact between the positive and negative electrodes to cause a short circuit, causing the battery to burn or even explode, threatening the safety of people's lives and property; ( 2) The separator provides free passage for lithium ions to form a conductive loop. Therefore, the separator plays an important role in the capacity, cycle stability, rate capability, and safety of lithium batteries. At present, polyolefin separators (including PP, PE and PP / PE / PP three-layer co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052B82Y30/00H01M50/403H01M50/411H01M50/443
CPCY02E60/10
Inventor 张俊平杨燕飞李凌霄李步成
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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