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Composition for preparing solid polymer electrolyte and application thereof

A composition and solid-state battery technology, applied in the field of lithium-ion batteries, can solve the problems of unsmooth ion transmission in the battery system, increase in interface impedance, and decrease in cycle performance, and achieve the effects of safety assurance, low viscosity, and improved safety.

Pending Publication Date: 2022-02-11
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the research of all-solid-state lithium-ion batteries, the bottleneck problem commonly faced by researchers is: the contact between the solid-state electrolyte layer and the positive and negative electrode layers is solid point-to-point particle contact, which causes the ion transmission in the battery system to be unsmooth. The problem of increased impedance and decreased cycle performance; therefore, how to improve the internal interface contact of all-solid-state batteries is the difficulty of current research

Method used

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  • Composition for preparing solid polymer electrolyte and application thereof
  • Composition for preparing solid polymer electrolyte and application thereof
  • Composition for preparing solid polymer electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a composition, including: LiTFSI, sulfolane, FEC, EC, PC, VC, PS, PST, AND, PEGDMA and AIBN;

[0055] Among them, in terms of mass ratio, sulfolane: FEC: EC: PC = 78: 10: 3: 9; based on the total mass of sulfolane, FEC, EC and PC, the concentration of LiTFSI is 1M, VC, PS, PST and AND The mass percentages are 0.5%, 3%, 0.7%, 0.6% respectively;

[0056] The mass percentage of PEGDMA in the composition is 5%; the mass percentage of AIBN in the composition is 0.2%.

[0057] This embodiment also provides a solid-state battery made using the above composition, specifically as follows:

[0058] (1) After mixing LiTFSI, sulfolane, FEC, EC, PC, VC, PS, PST, AND according to the above ratio, a non-flammable electrolyte was obtained;

[0059] Among them, sulfolane, FEC, EC, PC, VC, PS, PST and AND all adopt the Molecular sieves are used for water removal treatment to eliminate the influence of water on battery performance;

[0060] (2) Add PEGDMA and...

Embodiment 2

[0067] This embodiment provides a composition, including: LiTFSI, sulfolane, FEC, EC, PC, VC, PS, PST, AND, PEGDMA, MMA and AIBN;

[0068] Wherein, in terms of mass ratio, sulfolane:FEC:EC:PC=78:10:3:9; based on the total mass of sulfolane, FEC, EC and PC, the concentration of LiTFSI is 1M.

[0069] The mass percentage of PEGDMA in the composition is 1%; the mass percentage of MMA in the composition is 4%; the mass percentage of AIBN in the composition is 0.2%.

[0070] This embodiment also provides a solid-state battery made using the above composition, specifically as follows:

[0071] (1) After mixing LiTFSI, sulfolane, FEC, EC, PC, VC, PS, PST, AND according to the above ratio, a non-flammable electrolyte was obtained;

[0072] Among them, sulfolane, FEC, EC, PC, VC, PS, PST and AND all adopt the Molecular sieves are used for water removal treatment to eliminate the influence of water on battery performance;

[0073] (2) Add PEGDMA, MMA and AIBN to 5.0 g of non-flammab...

Embodiment 3

[0077] This embodiment provides a composition, including: LiTFSI, sulfolane, FEC, EC, PC, VC, PS, PST, ADN, PEGDMA, MMA and AIBN;

[0078] Wherein, in terms of mass ratio, sulfolane:FEC:EC:PC=78:10:3:9; based on the total mass of sulfolane, FEC, EC and PC, the concentration of LiTFSI is 1M.

[0079] The mass percentage of PEGDMA in the composition is 0.75%; the mass percentage of MMA in the composition is 4%; the mass percentage of AIBN in the composition is 0.2%.

[0080] This embodiment also provides a solid-state battery made using the above composition, specifically as follows:

[0081] (1) After mixing LiTFSI, sulfolane, FEC, EC, PC, VC, PS, PST, and ADN according to the above ratio, a non-flammable electrolyte was obtained;

[0082] Among them, sulfolane, FEC, EC, PC, VC, PS, PST and ADN have all adopted the Molecular sieves are used for water removal treatment to eliminate the influence of water on battery performance;

[0083] (2) Add PEGDMA, MMA and AIBN to 5.0 g ...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a composition for preparing a solid polymer electrolyte and application thereof. The composition comprises a nonflammable electrolyte and a monomer containing unsaturated double bonds, wherein the mass percentage content of the monomer containing the unsaturated double bonds in the composition is 1-50%. The composition provided by the invention has high thermal stability and high voltage resistance, and can be used for preparing a solid polymer electrolyte and a lithium ion battery which has the characteristics of high voltage, high safety, difficulty in volatilization, difficulty in inflation, nonflammability and the like. Besides, the composition has the advantages of high flash point, high boiling point, high voltage resistance, low viscosity and the like, and the safety of the soft package battery can be remarkably improved; and the polymer electrolyte is further prepared by adopting an in-situ curing technology, so that the safety of the high-voltage soft package lithium ion battery is doubly guaranteed.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a composition for preparing a solid polymer electrolyte and an application thereof. Background technique [0002] In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements on the energy density, cost, cycle and safety of secondary batteries represented by lithium-ion batteries. However, the liquid electrolyte of commercial lithium-ion batteries currently contains organic solvents with low flash points, which have safety problems such as flammability, explosion, and liquid leakage (J.Power Sources, 208:210-224, 2012), These safety issues have seriously hindered the further development of lithium-ion batteries. The solid-state lithium battery made of solid or semi-solid electrolyte instead of organic liquid electrolyte is expected to fundamentally solve the safety problem of the battery, and at the same time imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 黄欢卢青文孙学良王长虹柳羏包丹妮赵尚骞杨容王建涛
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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