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High capacity and Coulomb-efficiency lithium-ion capacitance battery anode system

A capacitor battery and Coulombic efficiency technology, applied in the field of electrochemistry, can solve the problems of reducing the energy density of capacitor batteries and high charge and discharge potentials of negative electrode materials, so as to improve reversible capacity, improve the first Coulombic efficiency, and solve the problem of low reversible capacity and first Coulombic efficiency Effect

Inactive Publication Date: 2010-09-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the negative electrode material used in this method has a high charge and discharge potential, which will reduce the energy density of the capacitor battery.

Method used

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  • High capacity and Coulomb-efficiency lithium-ion capacitance battery anode system
  • High capacity and Coulomb-efficiency lithium-ion capacitance battery anode system
  • High capacity and Coulomb-efficiency lithium-ion capacitance battery anode system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mesophase carbon microspheres and activated carbon were selected as negative electrode materials for lithium-ion capacitor batteries, and the mass ratio of mesophase carbon microspheres to activated carbon was 1:0.25; 1-ethyl-3-methylimidazole bistrifluoromethanesulfonyl Amine salt ionic liquid was used as solvent, and LiN(CF 3 SO 2 ) 2 The electrolyte solution is composed of a lithium-containing electrolyte salt, and the concentration of the lithium-containing electrolyte salt in the electrolyte solution is 0.8 mol / L. The negative electrode system of the lithium ion capacitor battery for testing is composed of the above lithium ion capacitor battery negative electrode material and electrolyte solution.

[0018] figure 1 Among them, curve 1 is the first charge-discharge curve of the negative electrode material of the lithium-ion capacitor battery in Example 1 in the electrolyte solution of Example 1. It can be seen from the figure that in this electrolyte solution, t...

Embodiment 2

[0020] Artificial graphite and activated carbon are selected as the negative electrode materials of lithium-ion capacitor batteries, and the mass ratio of artificial graphite and activated carbon is 1:0.25; 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt ionic liquid is used as the solvent , with propylene carbonate as the organic solvent, with LiN(CF 3 SO 2 ) 2 It is a lithium-containing electrolyte salt, constituting an electrolyte solution, and the concentration of the lithium-containing electrolyte salt is 0.8 mol / L, and the mass of the organic solvent is equal to 30% of the mass of the electrolyte solution. The negative electrode system of the lithium ion capacitor battery for testing is composed of the above lithium ion capacitor battery negative electrode material and electrolyte solution.

[0021] figure 1 Among them, curve 2 is the first charge-discharge curve of the negative electrode material of the lithium-ion capacitor battery in embodiment 2 in t...

Embodiment 3

[0023] Mesophase carbon microspheres and activated carbon were selected as negative electrode materials for lithium-ion capacitor batteries, and the mass ratio of mesophase carbon microspheres to activated carbon was 1:0.25; 1-ethyl-3-methylimidazole bistrifluoromethanesulfonyl Amine salt ionic liquid was used as solvent, and LiN(CF 3 SO 2 ) 2 It is a lithium-containing electrolyte salt, constituting an electrolyte solution, and the concentration of the lithium-containing electrolyte salt in the electrolyte solution is 0.8 mol / L. The negative electrode system of the lithium ion capacitor battery for testing is composed of the above lithium ion capacitor battery negative electrode material and electrolyte solution.

[0024] figure 2 It is the first charge-discharge curve of the negative electrode material of the lithium-ion capacitor battery in embodiment 3 in the electrolyte solution of embodiment 3. As can be seen from the figure, in this electrolyte solution, the negativ...

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PUM

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Abstract

The invention relates to a high capacity and Coulomb-efficiency lithium-ion capacitance battery anode system, belonging to the field of electrochemistry. The lithium-ion capacitance battery anode material comprises graphite-base anode material and activated carbon, and the electrolyte solution comprises ionic liquid and lithium salt, wherein the lithium salt is LiPF6 or LiN(CF3SO2)2, and the ionic liquid is 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide salt or N-methyl, propyl piperidinium bis((trifluoromethyl)sulfonyl)imide which is used as solvent. The organic solvent of propylene carbonate, ethylene carbonate, dimethyl carbonate or ethyl methyl carbonate can be added into the electrolyte solution to be used as the functional additive. The capacity and the Coulomb efficiency of the lithium-ion capacitance battery anode material can be markedly improved in the electrolyte solution.

Description

technical field [0001] The invention relates to a method for improving the capacity and coulombic efficiency of negative electrode materials of lithium ion capacitor batteries, belonging to the field of electrochemistry. technical background [0002] Lithium-ion capacitor battery is a new type of green energy storage device that has developed rapidly in recent years. It combines the advantages of high capacity of lithium-ion battery and high rate of supercapacitor. In lithium-ion capacitor battery, the combination of lithium-ion battery and supercapacitor There are two ways, one is the "external combination" type (that is, the two monomers are combined into an energy storage component or system through the power management system); the other is the "internal combination" type (that is, the organic combination of the two in the same monomer). Existing studies have shown that supercapacitors and lithium-ion batteries based on activated carbon electrode materials can obtain go...

Claims

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Application Information

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IPC IPC(8): H01M10/0563H01M4/133
Inventor 王志兴方杰郭华军李新海彭文杰张云河胡启阳
Owner CENT SOUTH UNIV
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