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Gel polymer electrolyte as well as preparation method and application thereof

A gel polymer and electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of low conductivity of porous electrolyte membranes, poor stability of lithium ion batteries, and reduction of electrolyte leakage rate, etc. The effect of improving cycle stability, improving electrochemical performance, and improving cycle performance

Inactive Publication Date: 2020-09-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a gel polymer electrolyte, its preparation method and application, which introduces a gel factor when the porous polymer matrix absorbs the electrolyte, so that the electrolyte is polymerized The gelation in the pores of the material matrix reduces its fluidity, thereby effectively reducing the leakage rate of the electrolyte, thereby improving the cycle performance of the alkali metal ion battery, thereby solving the problem of the low conductivity and high leakage rate of the existing porous electrolyte membrane And the technical problem of poor stability of the prepared lithium-ion battery

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  • Gel polymer electrolyte as well as preparation method and application thereof
  • Gel polymer electrolyte as well as preparation method and application thereof
  • Gel polymer electrolyte as well as preparation method and application thereof

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preparation example Construction

[0044] A kind of preparation method of gel electrolyte provided by the invention comprises the following steps:

[0045] (1) dissolving the polymer matrix in a solvent to obtain a mixed solution I;

[0046] (2) fully mixing the pore forming agent with the mixed solution I to obtain the mixed solution II;

[0047] (3) The mixed solution II is placed in a mold, and the porous polymer is obtained after drying;

[0048] (4) contacting the porous polymer with an electrolyte solution containing a liquid electrolyte, an alkali metal salt and a gel factor, so that the electrolyte enters the pores of the porous polymer, and under the action of the gel factor, The electrolytic solution is gelled to obtain a gel polymer electrolyte. The gelling factor used in the present invention interacts with the electrolyte solution entering the porous polymer matrix to form a hydrogen bond network, thereby gelling the electrolyte solution and reducing its fluidity.

[0049]In some embodiments, th...

Embodiment 1

[0097] A preparation method of a gel polymer electrolyte membrane, specifically comprising the steps of:

[0098] (1) Preparation of 1 g of polymer porous membrane.

[0099] This step is specifically as follows: dissolve polyvinylidene fluoride in 6 mL of N-methylpyrrolidone, stir and mix well, then add 0.3 mL of pore-forming agent glycerin, stir and mix well, and slowly pour the mixed solution on a glass plate, Then place it in an oven at 80°C and dry it for 24 hours to obtain 1 g of porous polymer membrane;

[0100] (2) Preparation of electrolyte solution 2h.

[0101] This step is specifically: ethylene carbonate and propylene carbonate are configured into a mixed solution according to a volume ratio of 2:6, and then lithium hexafluorophosphate and gel factor bis(3,4-dimethylbenzylidene)sorbitol are dissolved in the mixed solution In this method, the mass fraction of the lithium salt is 30%, the mass fraction of the gel factor is 2.5%, fully stirred and mixed evenly, and t...

Embodiment 2

[0105] A kind of its preparation method of gel polymer electrolyte membrane, specifically comprises the following steps:

[0106] (1) Preparation of the polymer porous membrane 1a.

[0107] This step is specifically as follows: dissolve the cross-linked polymer prepared in Comparative Example 1 and polyvinylidene fluoride in 3 mL of N-methylpyrrolidone according to a weight ratio of 1:10, stir and mix well, and then add 0.3 mL of pore-forming agent C Triol, fully stirred and mixed, slowly poured the mixed solution on a glass plate, and then dried in an oven at 80°C for 24 hours to obtain a porous polymer membrane 1a;

[0108] (2) Preparation of electrolyte solution 2b.

[0109] This step is specifically: dihexyl carbonate and propylene carbonate are configured into a mixed solution according to a volume ratio of 3:1, and then lithium perchlorate and gel factor 1,3:2,4-di-p-methylbenzylidene Sorbitol was dissolved in the mixed solution, the mass fraction of the lithium salt w...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a gel polymer electrolyte as well as a preparation method and application thereof. A gelator is introduced when a porous polymer matrix absorbs the electrolyte, so that the electrolyte is gelled in pores of the polymer matrix, the fluidity of the electrolyte is reduced, and further the leakage rate of the electrolyte is effectively reduced, the cycle performance of an alkali metal ion battery is improved, and the technical problems of relatively high leakage rate of an existing porous electrolytemembrane and low stability of the prepared lithium ion battery are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more specifically relates to a gel polymer electrolyte, its preparation method and application. Background technique [0002] While the progress of science and technology is rapidly improving people's living standards, it also consumes a huge amount of energy, resulting in a large consumption of non-renewable energy such as fossil fuels, and making people face a serious energy crisis. Therefore, in recent years, people are devoting themselves to developing more potential new energy sources. As an efficient energy storage device, lithium-ion batteries are more favored by people than unstable wind and solar power. At present, commercial lithium-ion batteries using liquid electrolytes have significant advantages such as large specific capacity, high output voltage, and no memory effect. Therefore, they have been widely used in many fields and greatly facilitate people's daily life...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525C08F283/06C08F222/14
CPCC08F283/065C08F2438/01H01M10/0525H01M10/0565H01M10/058C08F222/102Y02E60/10Y02P70/50
Inventor 薛志刚李少桥解孝林周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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