Lithium ion battery electrolyte and lithium ion battery

Abstract

The invention discloses a lithium ion battery electrolyte and a lithium ion battery. The lithium ion batter electrolyte comprises non-aqueous organic solvent, lithium salt, a functional additive, a flame-retardant additive and a negative electrode film-forming agent. According to the scheme of the lithium ion batter electrolyte, perfluoroalkyl diphenyl sulfide is used as the functional additive on the basis of reasonably optimizing the non-aqueous organic solvent, the lithium salt and the negative electrode film-forming agent; the problem that the novel lithium salt corrodes an aluminium current collector can be effectively solved, wherein the novel lithium salt comprises lithium trifluoromethanesulfonate (LiCF3SO3), perfluoroalkyl sulfonyl lithium methide (LiC (CF3SO2)3, bi(trifluoromethyl sulfonyl) lithium imide (LTFSI), bi(sulfonyl fluoride) lithium imide (LiFSI) and the like; the cycling performance of the lithium ion battery is improved; the LiPF6 can be well replaced by the lithium ion battery electrolyte, and the lithium ion battery electrolyte can be widely applied to the secondary lithium ion battery electrolyte, and particularly suitable for lithium ion power batteries for improving the thermal stability of the lithium ion power batteries.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Due to the advantages of high energy density, high working voltage, long cycle life, no memory effect, and fast charging and discharging, lithium-ion batteries have been widely used in electric vehicles, aerospace and other fields. However, in recent years, there have been frequent reports of fires and even explosions caused by lithium-ion batteries. The safety of lithium-ion batteries has aroused widespread concern, and it is the main obstacle that limits the industrial upgrading of lithium-ion batteries in the field of power and large-scale energy storage. As an important part of lithium-ion batteries, electrolyte is one of the important reasons for battery safety problems. [0003] Lithium-ion battery electrolyte plays a key role in the performance of the battery as a medium for transfe...

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Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the object of the present invention is to provide a high temperature resistant, safe lithium-ion battery electrolyte and lithium-ion battery, the lithium-ion battery electrolyte is especially suitable for lithium-ion power batteries, aiming to solve the current The thermal stability and safety performance of lithium-ion batteries in existing technologies need to be improved

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