Gel electrolyte of lithium ion battery and preparation method thereof

Abstract

The invention aims at providing a gelatinizing agent, capable of causing electrolyte of lithium ion battery to form stable gel while maintaining high ion conductivity, wherein the formed gel has higher gel phase inversion temperature. The structural formula of low molecular weight electrolyte of lithium ion battery organic gel used in the invention is as follows; wherein n is more than or equal to 16 and less than or equal to 30, X is -CHNHC4H9-, -CHNHC6H5-, -CHNHC6H5O-, -CHNHC6H3C2H6-, -CHNHC6H2C3H9-, -CHNHC6H4C4H9-, -CHNHCHO2-, -CHNHCOC6H5-, -CHHCOC6H5O-, -CHNHCOC6H3C2H6-, -CHCH2NH2-, -CHCH2NHC6H5-, -CHCH2NHC6H5O-, -CHCH2NHC6H3C2H6-, -CHCH2NHC6H2C3H9-, -CHCH2NHC6H5O- or -CHCH2NHC6H4OC4H9-; and Y is NH or O. The invention aims at providing a gel electrolyte of lithium ion battery. The get electrolyte of lithium ion battery provided by the invention completely meets the operating requirement of lithium ion battery.

Description

technical field [0001] The invention relates to a low-molecular-weight lithium-ion battery electrolyte organic gelling agent, a lithium-ion battery gel electrolyte prepared by using the organic gelling agent and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, no memory effect, wide operating temperature range, long cycle life, and environmental friendliness. They are rechargeable batteries (secondary batteries) with the best comprehensive performance available for selection. At present, commercial lithium-ion batteries mostly use liquid organic substances with high freezing point and low viscosity as solvents, and lithium salts are added to them as electrolytes to form liquid electrolytes. The use of liquid electrolyte makes the preparation process complicated. In addition, due to the volatility and fluidity of organic solvents, if the package is not properly packaged, the stability of the battery ...

AI Technical Summary

Problems solved by technology

Although the use of polymer gelling agents can alleviate the leakage problem of lithium-ion batteries and improve the safety of lithium-ion batteries to a certain extent, lithium hexafluorophosphate is commonly used as electrolyte salts in lithium-ion batteries, which can lead to polymer decomposition. , causing durability problems

For low-molecular-weight gelling agents, although there are currently many low-molecular-weight organic gelling agents that make organic solvents form gels, there are still the following deficiencies in applying them to lithium-ion battery electrolytes: some low-molecular-weight organic gelling agents can The organic solvents that form gels are very limited, and are not suitable for the organic solvents of lithium-ion battery electrolytes, that is, they cannot make the organic solvents of lithium-ion battery electrolytes form gels; some low-molecular-weight gelling agents can make the organic solvents of battery electrolytes Solvents form gels, but after adding electrolytes such as metal lithium salts, the addition of salts weakens the interaction (hydrogen bonds, static electricity, coordination) between low molecular weight gelling agents, making it difficult to form gels with lithium-ion battery electrolytes. The gel or the formed gel is not ideal; in addition, in order to make the gel have practical application value, the formed lithium-ion battery gel electrolyte must also have a high gel phase transition temperature, which is stable during the normal use of the lithium-ion battery. exists in a gel state

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