Lithium-ion battery non-aqueous electrolyte and lithium-ion battery thereof

Abstract

The present invention discloses a lithium-ion battery non-aqueous electrolyte which comprises a lithium salt, an organic solvent and an additive. According to the mass percentage content in the lithium-ion battery non-aqueous electrolyte, the additive comprises 0.5-2% of a lithium salt additive, 0.2-1.0% of a high-temperature additive, and 0.2-5% of other additives. The invention also discloses alithium-ion battery. The lithium-ion battery provided by the invention can give consideration to high-temperature and low-temperature performances, and the temperature range of the lithium-ion batteryin use is widened.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a non-aqueous electrolyte solution for high-voltage and wide-temperature lithium-ion batteries and a lithium-ion battery. Background technique [0002] The electrolyte in lithium-ion batteries is the medium connecting the positive and negative electrodes and the transmission medium of lithium ions, which plays an extremely important role. Usually, the main components of the electrolyte include organic solvents, lithium salts and additives. Among them, lithium salts provide lithium ions for internal current transmission; the role of organic solvents is to dissolve lithium salts and produce solvated lithium ions; there are many types of additives, which play a role in improving the stability, cycleability, and safety of lithium-ion batteries. The role of performance. [0003] The SEI film refers to a passivation film that covers the electrode surface when the electrode materi...

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Problems solved by technology

[0004] At present, one of the main problems faced by lithium-ion batteries is that they cannot take into account both high and low temperatures, that is, they cannot have excellent chemical properties at both high and low temperatures.

Under high temperature conditions, because the electrolyte in lithium-ion batteries is easy to catalyze and decompose on the surface of the positive electrode, resulting in battery flatulence and capacity reduction, etc., it is necessary to add a catalyst with excellent positive electrode film-forming properties to complex metal ions and passivate the active sites of the positive electrode. etc.; and the addition of such additives will lead to a significant increase in battery impedance, seriously affecting the rate performance of the battery and the low-temperature use effect

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