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Polymer electrolyte and battery containing polymer electrolyte

A technology of electrolyte and polymer, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve problems affecting battery performance, oxidation reaction, etc., and achieve the effect of improving rate performance and cycle performance

Inactive Publication Date: 2018-12-11
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, additives that do not contain polymerizable double bonds or free amines can improve the thermal stability of the electrolyte, but additives that are not resistant to oxidation are prone to oxidation reactions with the positive pole; additives that are not easily reducible are prone to reduction reactions with the negative pole, and Affect battery performance

Method used

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  • Polymer electrolyte and battery containing polymer electrolyte
  • Polymer electrolyte and battery containing polymer electrolyte
  • Polymer electrolyte and battery containing polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of electrolyte solution containing gel monomer:

[0035] Add 0.24g of trimethylolpropane triacrylate, 0.24g of n-hexyl acrylate, and 0.0036 lauroyl peroxide into 12g of electrolyte (EC / DEC / EMC=1 / 1 / 1, VC2%, LiPF6 is 1mol / L) g, N,N-diethylacrylamide 0.024g, mix well, record as C1;

[0036] (2) Preparation of lithium ion battery:

[0037] The electrolyte C1 containing the gel monomer in this example was used to inject it into the battery SL375870. The positive electrode used was lithium cobalt oxide, and the negative electrode used was graphite. The conventional method in the field was used to make a soft pack battery, and the room temperature was aged for 42 hours. Heat at 80°C for 4 hours to make the electrolyte gel, and then use the conventional method in this field to make up the composition, denoted as S1.

Embodiment 2

[0039] The same method as in Example 1 was used to prepare the soft-pack lithium-ion battery sample, except that the electrolyte solution containing the gel monomer was prepared: the difference was that N,N-diethylacrylamide was 0.046g, and the polymer electrolyte and battery They are denoted as C2 and S2 respectively.

Embodiment 3

[0041] The same method as in Example 1 was used to prepare the soft pack lithium-ion battery sample, the difference was the preparation of the electrolyte solution containing the gel monomer: the difference was that the N,N-diethylacrylamide was 0.0072g, the polymer electrolyte and the battery They are denoted as C3 and S3 respectively.

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Abstract

The present invention provides a polymer electrolyte, which comprises a lithium salt, an electrolytic solution and a monomer, wherein the monomer comprises a first gel monomer containing (CH2CH2O)n and a second gel monomer containing (CH2)m, n is more than or equal to 1 and less than or equal to 4, m is more than or equal to 4 and less than or equal to 8, and a weight ratio of the first gel monomer to the second gel monomer is 1:3-3:1. The invention further provides a battery containing the polymer electrolyte, wherein the cycle life and the rate performance of the battery are improved while the affinity between the gel matrix and the electrolytic solution is balanced.

Description

technical field [0001] The invention belongs to the field of polymer electrolytes, in particular to a polymer electrolyte and a battery containing the polymer electrolyte. Background technique [0002] The polymer electrolyte is composed of a polymer and a lithium salt. The polymer lithium-ion battery can avoid the defects of the organic liquid electrolyte in the traditional lithium-ion battery that are prone to leakage and explosion during use. It has plasticity, flexibility, small size, It has the advantages of good safety performance and large-scale industrial production, so it has attracted widespread attention. However, the room temperature conductivity of existing polymer electrolytes is low, which cannot meet the application requirements. Ionic liquids are usually liquid at room temperature, and have the characteristics of low viscosity, non-volatile, non-combustible, low toxicity, high room temperature conductivity, and wide electrochemical window. Therefore, ionic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567H01M10/0568
CPCH01M10/0525H01M10/0567H01M10/0568Y02E60/10
Inventor 鲁丹雷裕东张宝生
Owner SHANGHAI BYD