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Lithium ion secondary battery and electrolyte thereof

A secondary battery and lithium-ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of lithium-ion secondary batteries, such as unfavorable performance, impact, and potential safety hazards, and improve low-temperature discharge performance and high-temperature cycle performance Effect

Active Publication Date: 2015-10-28
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resistance of the formed passivation film is too large, which will have an adverse effect on the performance of the lithium-ion secondary battery at low temperatures. series of safety hazards

Method used

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  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The lithium ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte solution of the lithium ion secondary battery (ie step (3)), 0.1M LiN(SO 2 CF 3 ) 2 , vinylene carbonate (VC) with a mass percentage (calculated as a non-aqueous organic solvent) of 1%, and 3-fluoro-1,3- Propane sultone (3-FPS).

Embodiment 2

[0065] The lithium ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte solution of the lithium ion secondary battery (ie step (3)), 0.1M LiN(SO 2 CF 3 ) 2 , vinylene carbonate (VC) with a mass percentage (calculated as a non-aqueous organic solvent) of 1%, and 3-fluoro-1,3- Propane sultone (3-FPS).

Embodiment 3

[0067] The lithium ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte solution of the lithium ion secondary battery (ie step (3)), 0.1M LiN(SO 2 CF 3 ) 2 , with a mass percentage (calculated as a non-aqueous organic solvent) of 1% vinylene carbonate (VC) and a mass percentage (calculated as a non-aqueous organic solvent) of 2% 3-fluoro-1,3- Propane sultone (3-FPS).

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Abstract

The present invention provides a lithium ion secondary battery and an electrolyte thereof. The lithium ion secondary battery electrolyte comprises a non-aqueous organic solvent, a lithium salt dissolved in the non-aqueous organic solvent, and an additive dissolved in the non-aqueous organic solvent, wherein the additive is vinylene carbonate (VC), a lithium-containing compound of sulfonimide LiN(CxF2x+1SO2)fluoro(CyF2y+1SO2) (wherein x and y are positive integers), and fluoro 1,3-propanesultone having a structure represented by a formula I, R1, R2 and R3 are respectively and independently selected from fluorine atom, the mass of the vinylene carbonate (VC) is 0.1-2% of the mass of the non-aqueous organic solvent, the concentration of the lithium-containing compound of sulfonimide LiN(CxF2x+1SO2)fluoro(CyF2y+1SO2) is 0.02-0.2 M, and the mass of the fluoro 1,3-propanesultone is 0.5-5% of the mass of the non-aqueous organic solvent. The lithium ion secondary battery comprises the electrolyte. With the Lithium ion secondary battery electrolyte of the present invention, the low temperature discharge performance and the high temperature cycle performance of the lithium ion secondary battery can be improved. The formula I is defined in the specification.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion secondary battery and an electrolyte thereof. Background technique [0002] With the popularization of consumer electronics products such as notebook computers, mobile phones, handheld game consoles, tablet computers, etc., people have more and more stringent requirements for the batteries used in them, not only requiring the batteries to be small and light, but also requiring the batteries to have high Capacity, long life and stable performance. Among secondary batteries, compared with other types of batteries, lithium-ion secondary batteries have always occupied a mainstream position in the market due to their higher energy density. [0003] At high temperature, the reactivity of the electrolyte in the lithium-ion secondary battery on the surface of the positive electrode and the surface of the negative electrode is further enhanced, resulting in a large amount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 叶士特付成华王阿忠褚春波
Owner CONTEMPORARY AMPEREX TECH CO
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