Electrolyte solution of lithium manganate battery used at high temperature

Abstract

The invention discloses an electrolyte solution capable of solving the problem of poor high-temperature performance of a lithium manganate battery. The electrolyte solution contains a lithium salt, a non-aqueous organic solvent, various additives and the like, wherein the lithium salt accounts for 15-20% of the electrolyte solution based on the total weight of the electrolyte solution; the non-aqueous organic solvent accounts for 60-80% of the electrolyte solution based on the total weight of the electrolyte solution; the additives account for 8-19% of the electrolyte solution based on the total weight of the electrolyte solution; the additives are preferentially selected from combination of a film-forming additive, a high-temperature additive, an anti-overcharging additive, a flame-retardant additive and a stable additive; and in the additives, the additive amount of the film-forming additive is preferentially 0.2-5%, the additive amount of the high-temperature additive is preferentially 0.2-5%, the additive amount of the anti-overcharging additive is preferentially 0.2-5%, the additive amount of the flame-retardant additive is preferentially 0.2-5%, and the additive amount of the stable additive is preferentially 0.003-3.0%. The electrolyte solution is characterized in that various additives of the electrolyte solution are reasonably designed in component; and a 3,4-difluorosulfolane additive is also added, so that the lithium manganate battery manufactured from the electrolyte solution has excellent high-temperature performance.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium ion battery, in particular to a nonaqueous electrolyte solution for solving the problem of poor high-temperature performance of a lithium ion battery using lithium manganate as a positive electrode material. Background technique [0002] Over the past 20 years, lithium-ion batteries have been widely used in electronic communication fields such as mobile phones, notebook computers, and digital products, and have occupied a dominant position. Due to problems such as technology and cost, lithium-ion batteries have been stuck in the field of use of small and medium-sized batteries. With the rapid development of lithium-ion battery key material technology and battery technology, large-scale power batteries and battery packs used in vehicles, electric tools, and electric toys have begun to become popular in daily life. Manganese-based cathode materials are considered to be the most promising cat...

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Problems solved by technology

However, due to cost and technical problems, it has not been widely applied

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