Incombustible lithium ion battery electrolyte

Abstract

The invention discloses incombustible lithium ion battery electrolyte, which is prepared from an organic solvent, lithium salt and a cathode film formation additive, wherein the organic solvent is a mixed solvent of trifluoro propylene carbonate and carbonic ester; the cathode film formation additive is fluoroethylene carbonate; the electrolyte lithium salt is lithium hexafluorophosphate. The incombustible lithium ion battery electrolyte has the advantages that by controlling the content of the trifluoro propylene carbonate in the organic solvent, the flame resistant performance of the electrolyte can be improved; through ignition experiments, the condition that when the trifluoro propylene carbonate in the organic solvent accounts for 40 to 75 volume percent, the electrolyte cannot be ignited by open fire is found; meanwhile, through tests, a lithium ion battery prepared by the electrolyte provided by the invention has good cycle-specific volume, high magnification and power characteristics; an important effect is achieved on the development of high-energy-density power batteries with high safety.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrolytes, in particular to a non-combustible lithium-ion battery electrolyte. Background technique [0002] With its high energy density, high voltage, high power, low self-discharge and environmental friendliness, lithium-ion batteries are expected to replace fossil fuels as the power source for vehicles. It is of great significance to solve the current energy and environmental crisis. Lithium-ion battery electrolyte is the core part of lithium-ion batteries, and it plays the role of transferring charge in the battery. It plays a vital role in key evaluation parameters such as specific capacity, cycle efficiency, operating temperature range and safety performance of the battery. However, the traditional lithium-ion battery electrolyte is flammable, easy to decompose, and has a narrow temperature range. When it is higher than 60°C, the battery capacity decays rapidly, and it may even burn ...

AI Technical Summary

Problems solved by technology

However, the traditional lithium-ion battery electrolyte is flammable, easy to decompose, and has a narrow temperature range. When it is higher than 60°C, the battery capacity decays rapidly, and it may even burn or explode when working at high temperature for a long time, which limits its wide application.

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