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A kind of quasi-solid electrolyte and its preparation method and application

An electrolyte, quasi-solid-state technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, electrolyte immobilization/gelation, etc., can solve the problems of unsatisfactory conductivity of all-solid electrolyte, flammable electrolyte, lithium dendrites, etc. Achieve the effects of improving conductivity and interface stability, improving safety performance, and enhancing rate performance

Active Publication Date: 2021-07-16
南通赛得能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium dendrites may appear in liquid lithium-ion batteries working at high currents, which can pierce the diaphragm and cause short-circuit damage; the electrolyte is an organic liquid, which will intensify the tendency of side reactions, oxidative decomposition, gas generation, and combustion at high temperatures
When the liquid lithium-ion battery is subjected to severe impact or the battery temperature is too high, the electrolyte is very easy to burn, causing the battery to catch fire and more serious safety accidents
[0004] Liquid batteries are eagerly changing to solid-state batteries, but the conductivity of all-solid-state electrolytes is not ideal now, so it will slowly transition from quasi-solid-state batteries to all-solid-state batteries

Method used

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  • A kind of quasi-solid electrolyte and its preparation method and application
  • A kind of quasi-solid electrolyte and its preparation method and application
  • A kind of quasi-solid electrolyte and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example discloses a quasi-solid electrolyte and its preparation method and application. In this example, ZMS-5 is used for screening mesoporous molecules;

[0042] Raw material ratio of quasi-solid electrolyte: 50wt% methyl methacrylate, 30wt% LAGP, 20wt% ZMS-5, the amount of acetonitrile is 4 times the mass of reactants;

[0043] Dissolve methyl methacrylate in acetonitrile, stir at a speed of 5000rpm and fully dissolve, then add high-concentration phosphate Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 and ZMS-5, at 60°C, stirring at a speed of 5000rpm, stirring slowly for 48 hours, to obtain a liquid composite polymer solid electrolyte, continue the reaction until the acetonitrile is completely volatilized, and dry to obtain a solid composite polymer solid electrolyte.

[0044] In this embodiment, the quasi-solid-state electrolyte is prepared by in-situ polymerization, using methyl methacrylate as the skeleton and phosphate-based materials with high salt concentration to p...

Embodiment 2

[0060] The main difference between this embodiment and embodiment 1 is:

[0061] Raw material ratio of quasi-solid electrolyte: 60wt% methyl methacrylate, 10wt% LAGP, 30wt% HMS, and the amount of acetonitrile is 4 times the mass of reactants;

[0062] Dissolve methyl methacrylate in acetonitrile and stir at a speed of 10000rpm. After fully dissolving, add high-concentration phosphate Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 and HMS, at 50°C, stirring at a speed of 10,000rpm, stirring slowly for 40 hours, to obtain a liquid composite polymer solid electrolyte, and continue the reaction until the acetonitrile is completely volatilized, and dried to obtain a solid composite polymer solid electrolyte.

Embodiment 3

[0064] The main difference between this embodiment and the embodiment is:

[0065] Raw material ratio of quasi-solid electrolyte: methyl methacrylate 70wt%, LAGP 20wt%, MCM-41 10wt%, the amount of acetonitrile is 4 times the amount of reactants;

[0066] Dissolve methyl methacrylate in acetonitrile and stir at a speed of 15000rpm. After fully dissolving, add high-concentration phosphate Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 and MCM-41, at 40°C, stirred at a speed of 15000rpm, stirred slowly for 32 hours to obtain a liquid composite polymer solid electrolyte, and continued to react until the acetonitrile was completely volatilized and dried to obtain a solid composite polymer solid electrolyte.

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Abstract

The invention discloses a quasi-solid electrolyte and its preparation method and application. The quasi-solid electrolyte includes: 50% to 80% methyl methacrylate; 10% to 30% Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 ; 10% to 30% mesoporous molecular sieve; the invention also discloses the preparation method of the quasi-solid electrolyte and the lithium ion battery using the quasi-solid electrolyte; , to avoid side reactions caused by excessive contact between the electrolyte and the positive and negative electrodes; while ensuring that the battery has good electrochemical performance, the safety performance is also significantly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a quasi-solid electrolyte and a preparation method and application thereof. Background technique [0002] With the popularization of electric vehicles, the safety issues of high energy density lithium batteries are becoming increasingly severe. Especially in recent years, the electric vehicle fire incidents reported internationally and domestically have become more and more frequent, which highlights the challenge of designing batteries with both safety and energy density. [0003] At present, industrialized lithium-ion batteries, including global power batteries, are basically liquid lithium-ion batteries. No matter what kind of electrolyte is an organic component, plus a separator, the proportion of flammables in a liquid lithium-ion battery is relatively large. Lithium dendrites may appear in liquid lithium-ion batteries working at high currents, which can pier...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082H01M2300/0085Y02E60/10
Inventor 孙晓玉李炳江王立群郑浪易祖良刘奕凯叶鑫
Owner 南通赛得能源有限公司
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