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Electrolyte and secondary lithium battery and capacitor containing electrolyte

An electrolyte and capacitor technology, applied in the field of secondary lithium batteries and capacitors, can solve the problems of current collector corrosion, limit the wide application of electrolyte, affect the cycle life and efficiency of secondary lithium batteries and electrochemical capacitors, and achieve enhanced phase capacitive and improve cycle performance

Inactive Publication Date: 2014-02-12
INST OF PHYSICS - CHINESE ACAD OF SCI +2
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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 process of charging and discharging 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 at present, that is, secondary lithium batteries and electrochemical capacitors, and limits the wide application of electrolytes composed of this type of lithium.

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

[0048] The present embodiment provides a kind of electrolytic solution, comprises:

[0049] An organic solvent consisting of dimethyl carbonate (DMC) and ethylene carbonate (EC) in a volume ratio of 1:1;

[0050] Conductive lithium salt consisting of LiFSI at a concentration of 0.01 mol / L;

[0051] Anti-corrosion additive consisting of MTES at a concentration of 1×10 -6 mol / liter.

[0052] This electrolyte solution is denoted as A1, and its performance will be described in detail below.

Embodiment 2

[0054] The present embodiment provides a kind of electrolytic solution, comprises:

[0055] An organic solvent, consisting of dimethyl carbonate and ethylene carbonate at a volume ratio of 1:1;

[0056] Conductive lithium salt consisting of LiFSI at a concentration of 1 mol / l;

[0057] Anti-corrosion additive consisting of MTES at a concentration of 1×10 -6 mole / liter;

[0058]The second lithium salt (that is, another lithium salt that coexists with LiFSI in the electrolyte at the same time, and this lithium salt does not have any negative effects on the electrochemical performance of LiFSI), consists of bis(trifluoromethylsulfonyl) Lithium amide (LiTFSI) at a concentration of 0.4 mol / L.

[0059] The electrolyte solution is referred to as A2. The difference between A2 and A1 lies in the concentration of LiFSI and the addition of a second lithium salt LiTFSI. The performance of A2 will be described in detail below.

Embodiment 3

[0061] The present embodiment provides a kind of electrolytic solution, comprises:

[0062] An organic solvent, consisting of dimethyl carbonate and ethylene carbonate at a volume ratio of 1:1;

[0063] Conductive lithium salt consisting of LiFSI at a concentration of 1 mol / l;

[0064] Anti-corrosion additive, consisting of MTES, at a concentration of 0.01 mol / l.

[0065] The electrolyte is referred to as A3. The difference between A3 and A1 lies in the concentration of LiFSI and MTES, and its performance will be described in detail below.

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Abstract

The invention provides an electrolyte containing an organic solvent, a conductive lithium salt comprising lithium fluorosulfonyl imide, and MTES (methyl triethoxysilane) and LiFNFSI (lithium (fluorosulfonyl)(nonafluorobutanesulfonyl)imide) or one of the MTES and LiFNFSI. The invention also provides a lithium battery and a capacitor containing the electrolyte.

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] As a new type of chemical energy, lithium secondary batteries have the characteristics of high energy density, high working voltage, long cycle life, rich raw material resources, and environmental friendliness, and have been widely used in people's production and life. Lithium secondary batteries are mainly composed of positive electrodes, negative electrodes and electrolytes that conduct lithium ions, which directly affect the performance of lithium secondary batteries. [0003] At present, the electrolytes of commercial secondary lithium batteries and electrochemical capacitors are mainly composed of organic carbonates (such as dimethyl carbonate (DMC),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0567H01G11/62
CPCH01G11/60H01G11/62H01M10/052H01M10/0567H01M10/0568Y02E60/10Y02E60/13
Inventor 周思思黄学杰周志彬聂进胡小春
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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