Non-aqueous electrolyte for lithium battery, preparation method of non-aqueous electrolyte and lithium ion battery

Abstract

The invention discloses a non-aqueous electrolyte for a lithium battery, a preparation method of the non-aqueous electrolyte and the lithium ion battery. The non-aqueous electrolyte for the lithium battery comprises an electrolyte salt, a non-aqueous organic solvent and an additive, and the electrolyte salt comprises hypophosphite. According to the non-aqueous electrolyte for the lithium battery, the electrolyte salt contains hypophosphite, so that the high-temperature cycle and storage performance of the lithium battery is improved, and the low-temperature impedance is reduced.

Description

technical field [0001] The invention relates to the technical field of electrolytes, in particular to a non-aqueous electrolyte for a lithium battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] Due to the advantages of high voltage, high specific energy, no memory effect and long cycle life, lithium-ion batteries are widely used in 3C consumer electronic products such as mobile phones, cameras, and notebook computers. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and electrolytes. [0003] A kind of prior art scheme provides a kind of non-aqueous electrolytic solution and non-aqueous electrolyte secondary battery, described non-aqueous electrolytic solution contains monofluorophosphate and / or difluorophosphate, and contains specific chemical structure or Non-aqueous electrolyte solution of compounds with specific physical properties, excellent discharge load characteristics, hig...

AI Technical Summary

Problems solved by technology

However, their common feature is that they are unstable during battery operation and are easily reduced or oxidized. Although this is the way they work as additives (synergy with solvent decomposition), it also brings side reactions to battery operation. , requires additional balancing treatment, which increases the cost of the electrolyte and the difficulty of research and development

Secondly, these salts basically have high cost and certain toxicity, which further limits the use of lithium-ion battery electrolyte

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