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Electrolyte and secondary battery containing same

An electrolyte and organic solvent technology, applied in the field of secondary batteries, can solve problems such as inability to generate, difficult to burn, high ignition point and flash point, and achieve the effects of improving oxidation resistance, improving cycle stability, and overcoming incompatibility

Active Publication Date: 2016-08-17
NINGDE AMPEREX TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sulfone compounds are more difficult to burn than carbonate solvents, and have higher ignition and flash points. They are safe solvents and have a wider electrochemical window than carbonate solvents. For the development of high-energy density and safe electrolytes, sulfone electrolysis However, the sulfone compound is not compatible with the carbon material electrode as the solvent of the electrolyte, that is, the sulfone electrolyte cannot form a stable solid electrolyte interface film (SEI) film on the surface of the carbon material electrode.

Method used

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  • Electrolyte and secondary battery containing same
  • Electrolyte and secondary battery containing same
  • Electrolyte and secondary battery containing same

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Embodiment Construction

[0041] The purpose of this application is to provide a kind of electrolytic solution, comprise lithium salt, organic solvent and additive, contain sulfone compound in the organic solvent, contain sulfonate quaternary ammonium salt in the additive, overcome sulfone solvent and graphite contact reaction and cause incompatibility, cycle Disadvantages of easy gas production.

[0042] As an improvement of the electrolyte solution of the present application, the structural formula of the sulfonate quaternary ammonium salt used in the present application is shown in formula I:

[0043]

[0044] Among them, R 11 selected from substituted or unsubstituted C 1～12 Alkyl, substituted or unsubstituted C 2～12 Alkenyl, substituted or unsubstituted C 2～12 Alkynyl, substituted or unsubstituted C 1～12 Alkoxy, substituted or unsubstituted C 1～12 Acyloxy;

[0045] R 12selected from substituted or unsubstituted C 1～12 Alkylene, substituted or unsubstituted C 2～12 Alkenylene, substitute...

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Abstract

The invention relates to the field of batteries, in particular to an electrolyte and a secondary battery containing the same. The electrolyte comprises lithium salt, an organic solvent and an additive. The additive comprises sulphonate quaternary ammonium salt, and the organic solvent contains a sulphone compound. Sulphonate quaternary ammonium salt is added to a graphite cathode, film forming is achieved before the sulphone compound, the defect that a sulphone solvent makes contact with graphite for a reaction, so that incompatibility is generated is overcome, and the circulation performance of the battery is improved.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to an electrolyte and a secondary battery containing the electrolyte. Background technique [0002] High-voltage cathode materials for secondary batteries have been a research hotspot in recent years, and high-voltage electrolytes that are compatible with them are one of the research priorities in this field. According to reports, there have been many studies on high-voltage cathode materials, and their charging voltage is close to or higher than 5V, but there are few reports on matching high-voltage electrolytes. Due to the instability of the electrolyte at high potential, for example, the traditional carbonate-based electrolyte will be oxidized and decomposed above 4.5V, which will cause the secondary battery to swell under high-voltage charging and discharging, and the cycle performance will deteriorate. The study of high-voltage electrolyte has important theoretical signific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 湛英杰颜剑罗莉刘文浩付成华
Owner NINGDE AMPEREX TECH
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