A kind of lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems that have not yet been seen, and achieve the effects of improving low-temperature discharge performance and high-temperature storage performance, high boiling point, and low viscosity
CN104124469BActive Publication Date: 2017-12-29XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN UNIV
Publication Date
2017-12-29

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Abstract

The invention discloses a lithium-ion battery electrolyte relating to a lithium ion battery. The lithium-ion battery electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the organic solvent comprises propylene carbonate, chain carboxylic ester and chain carbonic ester, wherein the content of propylene carbonate is 24-58 percent, the content of chain carboxylic ester is 9-58 percent, the content of chain carbonic ester is 0-26 percent, the content of the lithium salt is 9-16 percent, and the content of the additive is 2-10 percent; and the additive is selected from vinylene carbonate, fluoroethylene carbonate, vinyl vinylene carbonate, glycol sulfite, vinyl glycol sulfite, propylene sulfite, dimethyl sulfate or trimethylene sulfate. Propylene carbonate is used for completely replacing ethylene carbonate, and is low in melting point and high in boiling point, thus a temperature window of the electrolyte can be enlarged; and chain carboxylic ester is low in melting point and low in viscosity, thus the solidifying point and the viscosity of the electrode can be reduced, and the conductivity of the electrode is increased. PC (Poly Carbonate) co-block is inhibited by using the additive in the electrolyte, thus the film-forming property for the surface of a negative electrode can be improved, and the high-temperature storage property is improved.
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Description

technical field

[0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery electrolyte with improved low-temperature discharge characteristics and high-temperature storage characteristics. Background technique

[0002] Lithium-ion secondary batteries have become one of the most widely used secondary batteries due to their advantages such as high voltage and high energy density. With the continuous deepening of the marketization of lithium-ion batteries, people's expectations for battery performance are getting higher and higher, and the demand for improving its temperature performance is becoming more and more urgent.

[0003] The electrolyte plays the role of conducting lithium ions between the positive and negative electrodes, which directly affects the charge and discharge performance of the battery. To analyze the components of the electrolyte, most commonly used solvents are cyclic carbonates (such as ethylene carbonate, propylene car...

Claims

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