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Electrolyte and lithium ion battery containing same

An electrolyte and lithium salt technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor low-temperature performance and unimproved first-time efficiency, reduce DCR, and improve high-temperature storage and high-temperature cycle performance. , to ensure the effect of stability

Active Publication Date: 2020-11-13
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first efficiency was not improved and the low temperature performance was poor

Method used

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  • Electrolyte and lithium ion battery containing same
  • Electrolyte and lithium ion battery containing same
  • Electrolyte and lithium ion battery containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of electrolyte: under argon atmosphere, electrolyte is prepared in a vacuum glove box with a moisture content6 , to obtain an electrolyte solution after mixing evenly. Among them, LiPF 6 The concentration is 1mol / L. The specific types and contents of the additives used in the electrolyte are shown in Table 1. In Table 1, the content of additives is the weight percent calculated based on the total weight of the electrolyte.

[0038] (2) Preparation of the positive electrode sheet: the nickel-cobalt lithium manganate ternary material LiNi 0.5 mn 0.3 co 0.2 o 2 , the binder PVDF and the conductive agent SuperP are mixed uniformly at a mass ratio of 95:1:4 to make a lithium-ion battery positive electrode slurry with a certain viscosity. After the mixed slurry is coated on both sides of the aluminum foil, it is dried and rolled Afterwards, the positive electrode sheet is obtained.

[0039] (3) Preparation of negative electrode sheet: make artificial gr...

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Abstract

The present invention provides an electrolyte, which comprises a lithium salt, a non-aqueous organic solvent and an additive. The additive comprises: (a) a cyclic sulfimide salt compound represented by structural formula 1: wherein R1 represents an alkali metal ion, and R2 and R3 each independently represent a halogen atom, a hydrogen atom or an organic group having 1-20 carbon atoms; (b) a siloxane compound represented by a structural formula 2: wherein R4 represents a boron element or a phosphorus-oxygen group, and R5, R6, R7, R8, R9, R10, R11, R12 and R13 each independently represent an alkyl substituent group having 1-10 carbon atoms. The electrolyte can promote the formation of a compact and thermodynamically stable SEI film, so that the high-temperature storage performance, the high-temperature cycle performance and the low-temperature performance of the lithium ion battery are improved. The invention also provides a lithium ion battery containing the electrolyte.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which has significant advantages such as high specific energy, high specific power, long cycle life, and small self-discharge. It has been widely used in mobile communications, digital cameras, video cameras and other electronic products, and has become a storage Energy and power battery development hotspot. [0003] Although the types of lithium-ion battery products are becoming more and more abundant, when most lithium-ion batteries are used in high-temperature environments, their battery capacity will decline rapidly. A layer of solid electrolyte interfacial film (SEI) film will be formed on the surface of the positive electrode with the electrolyte, and the SEI film will be easily damaged during the high temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 黄秋洁王霹霹毛冲白晶欧霜辉杨玲茱戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS