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Preparation method of multifunctional gel polymer electrolyte with gradient barium titanate content

A technology of gel polymer and gradient barium titanate, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of interface instability, poor temperature resistance of pure polymer fiber membranes, etc., to ensure ionic conductivity Efficiency and mechanical strength, the effect of achieving long-term cycle stability

Active Publication Date: 2021-01-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used polymer matrices for the preparation of gel electrolytes by electrospinning include PVDF and its copolymers PVDF-HFP, PEO, PMMA, and PAN. Therefore, it is necessary to blend nano-fillers in the matrix or adopt a multi-layer composite membrane method to improve the strength and improve the overall performance of the electrolyte membrane.

Method used

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  • Preparation method of multifunctional gel polymer electrolyte with gradient barium titanate content
  • Preparation method of multifunctional gel polymer electrolyte with gradient barium titanate content

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Component I is polyvinylidene fluoride-hexafluoropropylene with a molecular weight of 450,000 g / mol (Mw), produced by Aldrich Chemical Company of the United States. The dielectric constant of the polyvinylidene fluoride-hexafluoropropylene is greater than 6, and it has film-forming sex.

[0032] Component II is barium titanate, produced by Aldrich Chemical Company of the United States.

[0033] Component III is a mixed solvent of N,N-dimethylformamide and acetone, with a purity of ≥99%, produced by Beijing Tongguang Fine Chemical Co., Ltd., wherein the mixing mass ratio of N,N-dimethylformamide and acetone is is 0.7.

[0034] Add component II with a mass ratio of 0wt%, 8wt%, and 15wt% to component III, disperse with ultrasonic assistance for 2 hours, and after component II is evenly distributed in component III, add 20wt% component I, Heating and stirring at a temperature of 50-60° C. for 6-8 hours to obtain spinning solutions with component II contents of 0 wt %, 8 w...

Embodiment 2

[0039] Component I is polyvinylidene fluoride-hexafluoropropylene with a molecular weight of 450,000 g / mol (Mw), produced by Aldrich Chemical Company of the United States. The dielectric constant of the polyvinylidene fluoride-hexafluoropropylene is greater than 6, and it has film-forming sex.

[0040] Component II is barium titanate, produced by Aldrich Chemical Company of the United States.

[0041] Component III is a mixed solvent of N,N-dimethylformamide and acetone with a purity of ≥99%, produced by Beijing Tongguang Fine Chemical Co., Ltd. The mixing mass ratio of N,N-dimethylformamide and acetone is 0.8 .

[0042] Add component II with a mass ratio of 3wt%, 10wt%, and 17wt% to component III, ultrasonically disperse for 1 h to make component II evenly distributed in component III, add 15wt% component I, and Heat and stir at 50-60°C for 6-8 hours to obtain spinning solutions with component II contents of 3wt%, 10wt%, and 17wt%.

[0043] Under the conditions of a voltag...

Embodiment 3

[0047] Component I is polyvinylidene fluoride-hexafluoropropylene with a molecular weight of 500,000 g / mol (Mw), produced by Aldrich Chemical Company of the United States. The dielectric constant of the polyvinylidene fluoride-hexafluoropropylene is greater than 6, and it has film-forming properties sex. Component II is barium titanate, produced by Aldrich Chemical Company of the United States. Component III is a mixed solvent of N,N-dimethylformamide and acetone, with a purity of ≥99%, produced by Beijing Tongguang Fine Chemical Company. Component II with a mass ratio of 0wt%, 8wt%, and 15wt% was added to component III, wherein the mixing mass ratio of N,N-dimethylformamide and acetone in component III was 1.0. After ultrasonic dispersion treatment makes component II evenly distributed in component III, add 16wt% component I, and heat and stir at 50~60°C for 6~8h.

[0048] Under the conditions of a voltage of 23kV and a flow rate of 1mL / h, spinning solutions with mass ratio...

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Abstract

The invention provides a method for preparing a multifunctional gel polymer electrolyte with a gradient barium titanate content, which belongs to the field of polymer lithium ion batteries. The specific preparation method includes: step Ⅰ: adding polymer materials and barium titanate to N, N-dimethylformamide and acetone mixed solvent and mixed uniformly to prepare at least two kinds of spinning solutions with different barium titanate contents; The spinning solution with barium content is continuously electrospun to form a polymer fiber film with a gradient change in barium titanate content; step Ⅲ: dry the polymer fiber film obtained in step Ⅱ, and adsorb and electrolyze it in an argon environment liquid, activated and gelled to prepare a polymer electrolyte. The electrolyte prepared by the invention can not only ensure the ion conductivity and mechanical strength of the polymer electrolyte membrane after forming a battery, but also realize the long-term cycle stability of the lithium ion battery after being assembled into a battery.

Description

technical field [0001] The invention relates to a multifunctional gel polymer electrolyte prepared by electrospinning technology, which belongs to the field of polymer lithium ion batteries. Background technique [0002] As an important energy storage device, lithium-ion rechargeable batteries are widely used in various electronic equipment and energy devices for military and civilian use. For a long time in the past, a lot of research work on energy storage was mainly based on liquid electrolytes. Although it can basically meet the application requirements after a long period of research and development, its temperature resistance and safety are poor, and it is flammable and easy to leak. sex and toxicity, especially lithium metal (theoretical specific capacity is 3680 mA•h•g -1 ) as the negative electrode, the liquid electrolyte will cause a large number of lithium dendrites, which will pierce the separator after a long cycle and cause the battery to short circuit, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 隋刚吴嘉欣朱明杨小平
Owner BEIJING UNIV OF CHEM TECH
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