Electrolyte applicable to lithium titanate battery

Abstract

The invention relates to an electrolyte applicable to a lithium titanate battery. The electrolyte comprises an organic solvent and lithium salt. The electrolyte further comprises one or more of phenylacetylene derivatives which account for 0.05-10wt% of the electrolyte. The structural formula of the phenylacetylene derivative is as shown in the specification, wherein in the specification, R1, R2 and R3 are independently selected from any one of hydrogen, hydroxyl, halogen, alkyl, alkoxyl, halogenated alkyl, halogenated alkoxyl, alkylene, halogenated alkylene, phenyl, halogenated phenyl, biphenylyl, halogenated biphenylyl, phenyl ether groups, halogenated phenyl ether groups, halogenated triphenyl, amido, ester groups and cyano groups. Halogen is any one of F, Cl and Br. Halogenation is partial substitution or full substitution. According to the electrolyte provided by the invention, the discharge capacity and circulating service life of the lithium titanate battery are improved by adding the phenylacetylene derivatives in the electrolyte. A swelling problem of the lithium titanate battery in the circulating process is further appropriately solved.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte, in particular to an electrolyte in a lithium ion battery with lithium titanate as the negative electrode. Background technique [0002] With the rapid development of portable electronic devices, hybrid vehicles, electric vehicles, and space technology, higher requirements are placed on secondary batteries in terms of specific capacity, cycle life, and safety. The currently widely used lithium-ion battery anode material is a carbon-based material. Since the carbon anode material has a potential close to that of metal lithium, metal lithium dendrites are easily precipitated on the surface of the carbon electrode when the battery is overcharged, causing short circuits and thermal runaway. Therefore, it poses a great safety hazard to the battery, especially the power battery; at the same time, the repeated intercalation and deintercalation of lithium ions during charging and discharging will damag...

AI Technical Summary

Problems solved by technology

However, the current lithium titanate negative electrode material reacts with the electrolyte during the charging and discharging process, decomposes to generate gas, and has nowhere to release it, causing gas swelling, which in turn affects the capacity of the battery and the cycle effect.

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