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Composition for gel polymer electrolyte, gel polymer electrolyte and electrochemical device

A gel polymer and composition technology, applied in the field of electrochemistry, can solve problems such as increased electrolyte viscosity, increased electrolyte viscosity, and decreased electrical conductivity, and achieve the effects of high electrical conductivity, low content, and low viscosity

Active Publication Date: 2016-04-13
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. At present, macromolecular monomers are mostly used, and the molecular weight of the monomers is relatively large. Adding them into the liquid electrolyte will lead to a significant increase in the viscosity of the electrolyte, making it difficult for the electrolyte to penetrate into the pole piece and diaphragm after liquid injection. Incomplete infiltration occurs, resulting in poor battery
[0006] 2. The strength of the gel electrolyte is low, which is not conducive to the machinability of the battery, or in order to ensure the strength of the gel electrolyte after polymerization, a large amount of monomer is added, usually greater than 5% of the total mass of the electrolyte, resulting in the viscosity of the electrolyte Significantly increased, the conductivity decreased, which in turn caused a decrease in battery performance

Method used

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  • Composition for gel polymer electrolyte, gel polymer electrolyte and electrochemical device
  • Composition for gel polymer electrolyte, gel polymer electrolyte and electrochemical device
  • Composition for gel polymer electrolyte, gel polymer electrolyte and electrochemical device

Examples

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Embodiment 1

[0068] 1) Preparation of composition for gel polymer electrolyte

[0069] First, ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) are mixed in a mass ratio of EC:DEC:EMC=1:1:1 to make a non-aqueous organic solvent, and then Lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1.1mol / L, then add 2 wt% 1,3,5-triacryloylhexahydro-1,3,5-triazine (compound shown in Table 1 1), by the total mass of the composition is 2wt% ethoxyethoxyethyl acrylate (compound 9 shown in Table 2), and by the total mass of the composition is 0.01wt% AIBN, mixed Compositions for gel polymer electrolytes are prepared.

[0070] 2) Preparation of positive plate

[0071] First, lithium cobaltate as the positive electrode active material, carbon black Super-P as the conductive agent, and polyvinylidene fluoride (PVDF) as the binder, are lithium cobaltate in mass ratio: carbon black Super-P: PVDF=93:4:3 were mixed, and then they were dispersed in N-methyl-2-py...

Embodiment 2

[0077] In addition to the amount of 1,3,5-triacryloylhexahydro-1,3,5-triazine (Compound 1 shown in Table 1) in the preparation of the composition for the gel polymer electrolyte (by composition In terms of total mass, the following examples are all the same) except that it is changed to 3wt%, and others are the same as in Example 1.

Embodiment 3

[0079] In addition to changing the amount of 1,3,5-triacryloylhexahydro-1,3,5-triazine (compound 1 shown in Table 1) to 5 wt% in the preparation of the composition for the gel polymer electrolyte Other than that, it is the same as in Example 1.

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Abstract

The present invention relates to a composition for a gel polymer electrolyte, a gel polymer electrolyte obtained by polymerizing the composition, and an electrochemical device containing the gel polymer electrolyte. The composition for the gel polymer electrolyte includes a non-aqueous organic solvent, an electrolyte salt and a monomer, and the gel polymer electrolyte obtained by polymerization of the gel polymer electrolyte has a relatively high electrical conductivity at normal temperature , can improve the cycle performance of the battery; after gelation, it has greater gel strength, which is convenient for popularization and application, and has better high temperature resistance performance, which can effectively inhibit the expansion of the battery.

Description

technical field [0001] The present invention relates to the field of electrochemistry, in particular to a composition for gel polymer electrolyte, a gel polymer electrolyte obtained by polymerizing the composition, and a gel polymer electrolyte containing the gel polymer electrolyte electrochemical device. Background technique [0002] Since the 1990s, liquid electrolyte lithium-ion batteries have been widely used in various electronic appliances due to their advantages such as high energy density, wide temperature range, high operating voltage, and no heavy metal pollution. Gel polymer electrolyte lithium-ion battery is a new type of battery developed on this basis. In addition to the advantages of liquid electrolyte lithium-ion batteries, the gel state prevents the flow of liquid and effectively prevents battery leakage. , which greatly improves the safety of lithium-ion batteries. In addition, the conductivity of the gel polymer electrolyte is similar to that of the liqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F222/38C08F222/22C08F220/28C08F220/18C08F220/22C08F220/54C08F2/44H01M10/0565
CPCC08F2/44C08F222/103H01M10/0565H01M10/52H01M2300/0037H01M2300/0085Y02E60/10
Inventor 石桥张海玲
Owner SHENZHEN CAPCHEM TECH CO LTD