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Elastic gel electrolyte membrane and preparation method and application thereof

A technology of electrolyte membrane and elastic gel, which is applied in the field of elastic gel electrolyte membrane and its preparation, can solve the problems of lithium-ion battery safety hazards, mobile phones and electric vehicles burning and being unable to be stretched, etc., to promote flexibility, Effects of improving safety and improving mechanical properties

Active Publication Date: 2020-04-10
SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the electrolyte of commercial lithium-ion batteries generally uses extremely flammable carbonate-based organic solvents. The risk of leakage and combustion has led to huge safety hazards in lithium-ion batteries, and accidents involving mobile phones and electric vehicles have also occurred frequently.
At the same time, currently lithium-ion batteries mainly use polyolefin separators to block the contact between positive and negative electrodes, which not only has flammable characteristics, but also cannot be stretched, which cannot meet the needs of lithium-ion batteries in the direction of flexible devices and wearable devices.

Method used

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  • Elastic gel electrolyte membrane and preparation method and application thereof
  • Elastic gel electrolyte membrane and preparation method and application thereof
  • Elastic gel electrolyte membrane and preparation method and application thereof

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preparation example Construction

[0024] The invention provides a method for preparing an elastic gel electrolyte membrane, comprising the following steps:

[0025] Mix polyvinylidene fluoride-hexafluoropropylene copolymer, triethyl phosphate, fluoroethylene carbonate, butyl acrylate, polyethylene glycol diacrylate, lithium bistrifluoromethanesulfonimide and photoinitiator to obtain homogeneous slurry;

[0026] The homogeneous slurry is formed into a film under ultraviolet light to obtain an elastic gel electrolyte membrane.

[0027] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0028] The invention mixes polyvinylidene fluoride-hexafluoropropylene copolymer, triethyl phosphate, fluoroethylene carbonate, butyl acrylate, polyethylene glycol diacrylate, lithium bistrifluoromethanesulfonylimide and photoinitiator , to obtain a homogeneous slurry.

[0029] In the present invention, the mass ratio of triethyl phosphate to...

Embodiment 1

[0042] (1) Uniformly mix polyvinylidene fluoride-hexafluoropropylene copolymer, triethyl phosphate, and fluoroethylene carbonate to obtain solution A. Wherein, the mass ratio of triethyl phosphate to fluoroethylene carbonate is 3:1, and the mass ratio of the mixture of the two to polyvinylidene fluoride-hexafluoropropylene copolymer is 4:1.

[0043] (2) Evenly mix butyl acrylate, polyethylene glycol diacrylate, and lithium bistrifluoromethanesulfonimide to obtain solution B. Wherein, the mass ratio of butyl acrylate to polyethylene glycol diacrylate is 100:1, and the mass ratio of their mixture to lithium bistrifluoromethanesulfonimide is 3:1.

[0044] (3) Mix 50g of solution A with 50g of solution B, add photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, stir and mix to obtain homogeneous slurry. Wherein, the mass fraction of the photoinitiator in the mixture of butyl acrylate and polyethylene glycol diacrylate is 2%.

[0045] (4) Coat the homogeneous slurry obtained i...

Embodiment 2

[0052] (1) Uniformly mix polyvinylidene fluoride-hexafluoropropylene copolymer, triethyl phosphate, and fluoroethylene carbonate to obtain solution A. Wherein, the mass ratio of triethyl phosphate to fluoroethylene carbonate is 3:1, and the mass ratio of the mixture of the two to polyvinylidene fluoride-hexafluoropropylene copolymer is 3:1.

[0053] (2) Evenly mix butyl acrylate, polyethylene glycol diacrylate, and lithium bistrifluoromethanesulfonimide to obtain solution B. Wherein, the mass ratio of butyl acrylate to polyethylene glycol diacrylate is 80:1, and the mass ratio of the mixture of the two to lithium bistrifluoromethanesulfonimide is 4:1.

[0054] (3) Mix 50g of solution A with 50g of solution B, add photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, stir and mix to obtain homogeneous slurry. Wherein, the mass fraction of the photoinitiator in the mixture of butyl acrylate and polyethylene glycol diacrylate is 1%.

[0055] (4) Coat the homogeneous slurry ob...

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Abstract

The invention relates to the technical field of batteries, in particular to an elastic gel electrolyte membrane and a preparation method and application thereof. The preparation method comprises the following steps: mixing a polyvinylidene fluoride-hexafluoropropylene copolymer, triethyl phosphate, fluoroethylene carbonate, butyl acrylate, polyethylene glycol diacrylate, lithium bis(trifluoromethanesulfonyl)imide and a photoinitiator to obtain homogeneous slurry; and carrying out film formation on the homogeneous slurry under ultraviolet irradiation to obtain the elastic gel electrolyte membrane. The electrolyte membrane prepared by the invention can still keep good lithium ion conduction characteristics and electrochemical stability under different deformation conditions such as bending,twisting, stretching and the like; meanwhile, the electrolyte membrane has certain flame retardance. When the electrolyte membrane is applied to a lithium ion battery, the application of an elastic battery device becomes possible, and meanwhile, the safety of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an elastic gel electrolyte membrane and its preparation method and application. Background technique [0002] With the continuous development of the global economy and the continuous improvement of people's living standards, energy and environmental issues have become increasingly prominent. As a carrier for energy storage, secondary lithium-ion batteries have been widely used in many fields such as mobile phones, digital portable products, and electric vehicles due to their advantages such as high energy density, long cycle life, small self-discharge effect, and environmental friendliness. As an important part of lithium-ion batteries, the electrolyte plays an important role in conducting lithium ions in the battery. However, at present, the electrolyte of commercial lithium-ion batteries generally uses extremely flammable carbonate-based organic solvents. The risk of leakage...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08F259/08C08F283/06C08F220/18C08F2/48H01M10/0565H01M10/0525
CPCC08J5/18C08F259/08C08F283/065C08F2/48H01M10/0565H01M10/0525H01M2300/0085C08J2351/00C08J2351/08Y02E60/10
Inventor 涂江平张晟昭王秀丽夏新辉谷长栋
Owner SHANDONG IND TECH RES INST OF ZHEJIANG UNIV