Composite electrolyte and application thereof

A composite electrolyte and electrolyte technology, which is applied in the field of chemical power sources, can solve the problems that the electrical conductivity of all-solid-state batteries cannot meet the requirements, the electrical conductivity of all-solid-state electrolytes is unsatisfactory, and the coulombic efficiency of batteries is reduced, and the cycle and rate performance is not affected. Improve the energy density of the system and avoid side reactions

Active Publication Date: 2020-09-01
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

The conductivity of all-solid-state batteries cannot meet the requirements, and more exploration is needed to achieve mass production. Liquid batteries are eagerly changing to solid-state batteries, but the conductivity of all-solid-state electrolytes is not ideal now, so it will gradually transition from quasi-solid-state batteries to all-solid-state batteries
For solid-state batteries, metal lithium is the most ideal negative electrode material, but side reactions between the liquid electrolyte and lithium metal are prone to occur, resulting in the growth of lithium dendrites and reducing the Coulombic efficiency of the battery. It is currently the development of quasi-solid-state batteries. bottleneck

Method used

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  • Composite electrolyte and application thereof
  • Composite electrolyte and application thereof

Examples

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Embodiment 1

[0043] This embodiment discloses a composite electrolyte and a lithium ion battery using the composite electrolyte.

[0044] The composite electrolyte in this embodiment includes a gel electrolyte coated on the lithium negative electrode and a quasi-solid electrolyte coated on the positive electrode, the gel electrolyte and the quasi-solid electrolyte are in contact; electrolyte is adsorbed in the quasi-solid electrolyte;

[0045] The same Li between gel electrolyte and quasi-solid electrolyte 1.5 al 0.5 Ge 1.5 (PO 4 ) 3(abbreviated as LAGP).

[0046] The formulation of the adsorbed electrolyte in the quasi-solid electrolyte:

[0047] The solvent component of the electrolyte is 0.2mol / L fluorinated diether, EC:EMC=1:1, the additive amount is 0.1-0.3mol / L; the lithium salt is LiPF 6 , the addition amount is 1-1.5mol / L; the choice of electrolyte only affects the conductivity of the liquid system.

[0048] The mass fraction of each component in the gel electrolyte includes...

Embodiment 2

[0061] The main difference between this embodiment and embodiment 1 is:

[0062] Raw material ratio of the quasi-solid electrolyte: methyl methacrylate 60wt%, LAGP 10wt%, HMS 30wt%.

[0063] Polyethylene oxide is selected as the polymer matrix; ethylene carbonate is selected as the plasticizer; the raw material ratio of the gel electrolyte is: 80% polyethylene oxide, 15% LAGP, and 5% propylene carbonate.

[0064] The thickness of the quasi-solid electrolyte layer is 6um; the thickness of the gel electrolyte layer is 3um;

[0065] The batteries obtained in this example are designated as Group B.

Embodiment 3

[0067] The main difference between this embodiment and embodiment 1 is:

[0068] Raw material ratio of quasi-solid electrolyte: methyl methacrylate 70wt%, LAGP 20wt%, MCM-41 10wt%.

[0069] Polymethyl methacrylate is selected as the polymer matrix; ethyl methyl carbonate is selected as the plasticizer; the raw material ratio of the gel electrolyte is: 90% of polymethyl methacrylate, 6% of LAGP, and 4% of propylene carbonate.

[0070] The thickness of the quasi-solid electrolyte layer is 5um; the thickness of the gel electrolyte layer is 3um;

[0071] The batteries obtained in this example are designated as Group C.

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Abstract

The invention discloses a composite electrolyte and application thereof, the composite electrolyte comprises a gel electrolyte coated on a lithium negative electrode and a quasi-solid electrolyte coated on a positive electrode, and the gel electrolyte is in contact with the quasi-solid electrolyte; electrolyte is adsorbed in the quasi-solid electrolyte; both the gel electrolyte and the quasi-solidelectrolyte contain the same conductive lithium salt; the invention also discloses application of the composite electrolyte to a lithium ion battery. According to the invention, through cooperation of the two electrolytes, lithium dendrites are inhibited, and the composite electrolyte is ensured to have good conductivity.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a composite electrolyte and its application. 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] In order to further improve the energy density and safety performance of lithium-ion batteries, solid-state batteries have become the only way. The conductivity of all-solid-state batteries cannot meet the requirements, and more exploration is needed to achieve mass production. Liquid batteries are eagerly changing to solid-state batteries, but the conductivity of all-solid-state electrolytes is not ideal now, so it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065H01M2300/0085Y02E60/10
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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