High-voltage ternary positive electrode material system lithium ion battery electrolyte compatible with high/low-temperature performance

Abstract

The invention discloses a lithium ion battery electrolyte. The electrolyte comprises a non-aqueous organic solvent, a lithium salt, a film formation agent and additives, wherein four additives of fluorobenzonitrile, fluorobenzene, an oxalic acid and phosphoric acid lithium salt and a fluorotrioxophosphate lithium salt are simultaneously added into the lithium ion battery electrolyte, a synergistic effect will be generated by simultaneously using the additives, so that the ternary positive electrode material has advantages of excellent cycle property, high-temperature storage performance, low-temperature discharge performance, safety and the like under a high-voltage (4.3-4.5V) condition, and the problem that the cycle property, the high-temperature performance and the low-temperature performance of a high-voltage ternary battery electrolyte in the prior art cannot be simultaneously compatible is solved very well.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte of a high-voltage ternary positive electrode material system with both high and low-temperature performance and a high-voltage lithium-ion battery containing the electrolyte. Background technique [0002] Due to the advantages of high energy density, environmental friendliness, and long cycle life, high-voltage ternary cathode material lithium-ion batteries are widely used in portable electronic devices such as mobile phones and notebook computers, and are also considered to be the first choice for electric vehicles and large-scale energy storage devices. One of the best options. At present, power tools, electric vehicles, and large-scale energy storage devices have higher and higher energy density requirements for batteries, making it difficult for commercial ternary cathode material lithium-ion batteries (working voltage 4.2V) to ...

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Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a high-voltage ternary positive electrode material system lithium ion battery electrolyte with both high and low temperature performance, which can effectively improve the ternary positive electrode material battery at the same time. The cycle performance, high-temperature storage performance, low-temperature discharge performance and safety performance under the voltage (4.3-4.5V) condition have well solved the cycle performance, high-temperature performance and high-temperature performance of the lithium-ion battery electrolyte in the high-voltage ternary cathode material system in the prior art. The problem that the low temperature performance cannot be taken into account at the same time

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