Novel boron-containing sulfonate non-aqueous electrolyte additive and lithium ion battery prepared from same

Abstract

The invention relates to a novel boron-containing sulfonate non-aqueous electrolyte additive. The structural formula of the non-aqueous electrolyte additive is shown as a formula I, wherein the formula IR1 is selected from one of phenyl, biphenyl, fluorophenyl, cyano-containing phenyl and fluorobiphenyl; r2 and R3 are the same or different and are respectively and independently selected from one of methyl and trifluoromethyl. The boron-containing sulfonate non-aqueous electrolyte additive is applied to an electrolyte of a lithium ion battery, the electrolyte comprises a non-aqueous organic solvent, an electrolyte lithium salt and an additive, and the additive comprises the boron-containing sulfonate non-aqueous electrolyte additive. When the non-aqueous electrolyte additive is applied to the lithium ion battery, the internal resistance of the battery can be obviously reduced, and the low-temperature circulation, high-rate normal-temperature circulation, high-temperature circulation and expansion after high-temperature storage of the battery are obviously improved.

Description

technical field [0001] The invention relates to a novel boron sulfonate-containing nonaqueous electrolyte additive and a lithium ion battery prepared therefrom, belonging to the technical field of lithium ion battery nonaqueous electrolyte additives. Background technique [0002] Due to the characteristics of high energy density, long cycle life and no pollution, lithium secondary batteries have broad application prospects in consumer electronics, power vehicle batteries and energy storage power supplies. [0003] In order to improve the high-temperature performance of lithium-ion batteries, solvents with higher boiling points such as diethyl carbonate and ethyl methyl carbonate are generally selected as the main solvents of the electrolyte, but these solvents have higher melting points, and the conductivity of the electrolyte at low temperatures The drop is very fast and the battery impedance increases rapidly. It is difficult to satisfy the low-temperature discharge perfo...

AI Technical Summary

Problems solved by technology

However, by adding anti-overcharge additives to the electrolyte, although the safety performance can be improved to a certain extent, once the battery is overcharged, the damage to the battery is irreversible.

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