Electrolyte and secondary lithium battery and capacitor containing electrolyte

An electrolyte and electrolyte additive technology, applied in the field of lithium secondary batteries and electrochemical capacitors, non-aqueous organic solvent electrolytes, can solve the problem of affecting the cycle life and efficiency of secondary lithium batteries and electrochemical capacitors, limiting electrolytes 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: 2015-07-22
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 capacitors, especially the electrolyte system composed of this type of salt is harmful to the most common The corrosion of the aluminum foil of the cathode current collector is inevitable, which seriously affects the cycle life and efficiency of the only ion batteries that can be used commercially, that is, secondary lithium batteries and electrochemical capacitors, and limits the wide application of electrolytes composed of this type of lithium salt.

Method used

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  • Electrolyte and secondary lithium battery and capacitor containing electrolyte
  • Electrolyte and secondary lithium battery and capacitor containing electrolyte
  • Electrolyte and secondary lithium battery and capacitor containing electrolyte

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 electrolytic solution and a secondary lithium battery and an electrochemical capacitor containing the electrolytic solution. The electrolytic solution contains a lithium salt and an organic solvent, wherein the lithium salt includes lithium fluorosulfonimide and lithium perchlorate . The electrolytic solution containing lithium fluorosulfonyl imide and lithium perchlorate provided by the present invention has excellent properties such as high electrical conductivity, high lithium ion migration number, low viscosity, etc., because lithium perchlorate in the electrolytic solution can effectively reduce or Eliminate the corrosion of lithium fluorosulfonyl imide on the aluminum foil of the current collector above 4V, preferably with a series of functional additives, so that the performance of the electrolyte system provided by the present invention is better than that of the current commercial electrolyte system in all aspects.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0567H01G9/035H01G9/145
CPCY02E60/10Y02E60/13Y02P70/50
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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