A kind of electrolytic solution and secondary lithium battery and capacitor containing the electrolytic solution

A technology of electrolyte and electrolyte additive, which is applied in the field of non-aqueous organic solvent electrolyte, lithium secondary battery and electrochemical capacitor, and can solve the problem of affecting the cycle life and efficiency of secondary lithium battery and electrochemical capacitor, and limiting the electrolyte Wide application, current collector corrosion and other problems, to achieve the effect of low viscosity, high conductivity, high lithium ion migration number

Active Publication Date: 2011-12-14
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, lithium fluorosulfonyl imide represented by lithium bis(fluorosulfonyl)imide (LiFSI) has a serious disadvantage: in the charging and discharging process of secondary lithium batteries and electrochemical capacitors, the When the voltage is high, the electrolyte system containing this salt has serious corrosion phenomena on all kinds of current collectors commonly used in secondary lithium batteries and electrochemical capac...

Method used

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  • A kind of electrolytic solution and secondary lithium battery and capacitor containing the electrolytic solution
  • A kind of electrolytic solution and secondary lithium battery and capacitor containing the electrolytic solution
  • A kind of electrolytic solution and secondary lithium battery and capacitor containing the electrolytic solution

Examples

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Embodiment 1

[0060] This example is used to illustrate the preparation of the electrolyte solution provided by the present invention.

[0061] Dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) were mixed in a volume ratio of 5:2:3 in a glove box at room temperature, and difluorosulfonyl Lithium imide (LiFSI) (Department of Chemistry, Huazhong University of Science and Technology) and lithium perchlorate (LiClO 4 ) (analytically pure, Alfa Aesar) was formulated into bisfluorosulfonimide lithium with a concentration of 0.01 mol / liter and lithium perchlorate with a concentration of 1×10 -6 mol / liter solution, the electrolyte solution is stirred evenly to obtain the electrolyte solution of the present invention, which is denoted as A1.

Embodiment 2

[0063] This example is used to illustrate the preparation of the electrolyte solution provided by the present invention.

[0064] The electrolyte is prepared in the same manner as in Example 1, except that the concentration of LiFSI in the electrolyte is 1 mol / liter, and lithium hexafluorophosphate with a concentration of 0.4 mol / liter is added as the third lithium salt in the electrolyte to obtain The electrolyte is denoted as A2.

Embodiment 3

[0066] This example is used to illustrate the preparation of the electrolyte solution provided by the present invention.

[0067] The electrolytic solution was prepared in the same manner as in Example 1, except that the concentration of LiFSI in the electrolytic solution was 1 mol / liter, and 0.05 mol / liter of aluminum trifluoride (AlFSI) was also added in the electrolytic solution. 3 ) as an additive, the prepared electrolyte is denoted as A3.

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Abstract

The invention provides an electrolyte and a secondary lithium battery and an electrochemical capacitor containing the electrolyte. The electrolyte contains a lithium salt and an organic solvent, wherein the lithium salt comprises fluorine lithium sulfimide and lithium perchlorate. The electrolyte containing the fluorine lithium sulfimide and the lithium perchlorate, provided by the invention, has excellent performances, such as high conductivity, high ionic migration number, low viscosity, and the like. Because the lithium perchlorate in the electrolyte can be used for effectively reducing or eliminating the corrosion of fluorine lithium sulfimide above 4V to a current collector aluminum foil, the electrolyte provided by the invention is superior to the commercial electrolyte system in various aspects by preferably matching with a series of functional additives.

Description

technical field [0001] The invention relates to an electrolyte, a secondary lithium battery and a capacitor containing the electrolyte, and more particularly relates to a non-aqueous organic solvent electrolyte, a lithium secondary battery and an electrochemical capacitor using the electrolyte. Background technique [0002] Since the concept of rechargeable and dischargeable secondary lithium batteries was proposed in the early 1970s, secondary lithium batteries, as a new type of chemical energy, have high energy density, high working voltage, long cycle life, and abundant raw material resources. As well as being environmentally friendly, it is widely used in people's production and life. As one of the three major components of the secondary lithium battery, the electrolyte plays a role of ion conduction between electrodes in the work of the secondary lithium battery, directly affecting the performance of the secondary lithium battery. [0003] At present, the electrolytes ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0567H01G9/035H01G9/145
CPCY02E60/12Y02E60/10Y02E60/13Y02P70/50
Inventor 周思思韩鸿波冯绍伟周志彬聂进李泓黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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