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Gel electrolyte and preparation and application of precursor electrolyte of gel electrolyte

A gel electrolyte and electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, batteries, etc., can solve the problems of unsatisfactory performance of gel electrolyte, easy self-aggregation, unsatisfactory fluidity, etc., and improve high temperature cycle. Good performance, high temperature cycle life, good effect on migration

Active Publication Date: 2022-05-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve problems such as easy self-aggregation, unsatisfactory fluidity, and unsatisfactory performance of the obtained gel electrolyte in the existing gel electrolyte precursor electrolyte, the present invention The first purpose is to provide a gel electrolyte precursor electrolyte that has good fluidity, storage stability, and can significantly improve the electrochemical performance of the gelled electrolyte obtained.

Method used

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  • Gel electrolyte and preparation and application of precursor electrolyte of gel electrolyte
  • Gel electrolyte and preparation and application of precursor electrolyte of gel electrolyte
  • Gel electrolyte and preparation and application of precursor electrolyte of gel electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] The raw materials mentioned below are all dehydrated, water content ≤ 50ppm, HF ≤ 100ppm.

[0084] Taking 100g as an example, the composition of the mixture is:

[0085] First prepare liquid electrolyte (basic electrolyte): 90.99g, its composition is: EC:EMC:DMC=1:1:1(vol), LiPF 6 : 1M, VC: 1% (Weight) is recorded as La, and it is used as a comparative example of gel polymer electrolyte.

[0086] Then add the following substances to the liquid electrolyte to form a solid electrolyte precursor solution:

[0087] 1) Organic monomer: 8g

[0088]

[0089] 2) Crosslinking agent: propane trimethylol triacrylate: 1g

[0090] 3) Initiator: 2,2-azobisisobutyronitrile: 0.01g

[0091] Add the above substances into a container under a nitrogen protective atmosphere in turn, mix well at 14-16°C, and then inject an appropriate amount of the mixed solution (precursor solution) into a lithium-ion soft pack battery, a simple stainless steel inert electrode simulation battery, and a...

Embodiment 2

[0103] Compared with Example 1, the only difference is that the combined monomer of Formula A (4g) and Formula C (4g) is used; other operations and parameters, as well as battery assembly and testing methods are the same as in Example 1.

Embodiment 3

[0109] Compared with Example 1, the only difference is that Formula E is used as a monomer, and other operations and parameters, as well as battery assembly and testing methods are the same as in Example 1.

[0110]

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Abstract

The invention belongs to the technical field of solid electrolyte, and particularly discloses a gel electrolyte precursor electrolyte which comprises a basic electrolyte, a monomer, a cross-linking agent and an initiator, wherein the monomer comprises a compound with a structure shown in a formula 1; R1, R2 and R3 are respectively H, alkyl, cycloalkyl, heterocyclic radical, aryl or heterocyclic aryl; r4 and R5 are respectively an alkyl group, an acyl group or an ester group. The invention also comprises a technical scheme of cross-linking the precursor electrolyte to form the solid electrolyte. The gel polymer electrolyte is stable in chemical performance and electrochemical performance, the cycle life of the lithium ion battery is prolonged, the high temperature resistance of the lithium ion battery is improved, and the gel polymer electrolyte has high safety.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a preparation method of a solid-state battery. Background technique [0002] Due to its high energy density, long cycle life and environmental friendliness, lithium-ion batteries are widely used in digital products such as mobile phones and notebook computers, and are considered to be ideal power batteries for EVs and HEVs. According to the electrolyte, lithium-ion batteries can be divided into liquid lithium-ion batteries and polymer lithium-ion batteries. Liquid lithium-ion batteries have the advantages of high-current charge and discharge and low-temperature charge-discharge performance, but the liquid electrolyte is easy to leak and cause safety problems such as combustion and explosion. Polymer lithium-ion batteries do not have safety problems caused by electrolyte leakage, which has attracted more and more research and attention. Polymer electrolytes inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058A62C3/16C08F226/02C08F222/14C08F230/02
CPCH01M10/0565H01M10/0525H01M10/058A62C3/16C08F226/02H01M2200/00C08F222/103C08F230/02Y02P70/50Y02E60/10
Inventor 赖延清王姣丽洪波王麒羽张治安方静李劼
Owner CENT SOUTH UNIV
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