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Electrolyte for electrochemical capacitor and its preparing method

A technology of electrolyte and capacitor, which is applied in the field of preparation of electrolyte for electrochemical capacitors, can solve the problems of difficult and high specific capacitance, and achieve the effects of low price, increased charge and discharge capacity, and abundant raw materials

Inactive Publication Date: 2006-05-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, due to the limitation of the specific surface area of ​​the electrode material for the single electric double layer capacitance mechanism, it is difficult to greatly increase the specific capacitance on the existing basis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The electrode material and its preparation conditions are the same as above. With 1.5M FeSO 4 solution with 2M H 2 SO 4 The solutions are mixed at a volume ratio of 1:10 to form a mixed solution as an electrolyte. When charging and discharging at a constant current under the condition of current density I=0.2A / g, the mass specific capacitance of the single electrode of the supercapacitor reaches 545F / g; the result measured by cyclic voltammetry (dV / dt=5mV / S) is 562F / g . The charge-discharge capacity gradually tends to be stable with the increase of the number of cycles, and has good cycle stability.

Embodiment 2

[0018] The electrode material and its preparation conditions are the same as above. with 1M CuSO 4 solution with 2M H 2 SO 4 The solutions were mixed at a volume ratio of 10:1 to form a mixed solution as an electrolyte. When charging and discharging at a constant current under the condition of current density I=0.2A / g, the mass specific capacitance of the single electrode of the supercapacitor reaches 710F / g; the result measured by cyclic voltammetry (dV / dt=5mV / S) is 712F / g . The charge-discharge capacity gradually tends to be stable with the increase of the number of cycles, and has good cycle stability.

Embodiment 3

[0020] The electrode material and its preparation conditions are the same as above. with 2M CuCl 2 solution with 2M H 2 SO 4 The solutions are mixed at a volume ratio of 3:7 to form a mixed solution as an electrolyte. The mass specific capacitance of the supercapacitor single electrode measured by cyclic voltammetry (dV / dt=5mV / S) reaches 912F / g; when dV / dt=10mV / S, the result is 710F / g. Compared with the cyclic voltammetry curve of Example 2, it can be seen that the electrochemical reaction mechanism of the active material has changed, and the reversibility of the electrode process has been improved.

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Abstract

The invention relates to an electrolyte used in electrochemistry capacity which uses the chlorination, nitrates, sulfate, molybdate, or chromate of Fe, Co, Ni, Cu, Mn, Cr or Mo to match the water solution from 0.1m to fat solution as main electrolyte; it uses HNO3, H2SO4 or HCl to separately match the water solution from 0.5m to 8m as assistant electrolyte; it mixes one or some main electrolyte and assistant electrolyte with the volume ratio 1í†10í½10í†1 to obtain the electrolyte.

Description

technical field [0001] The invention relates to an electrolyte and a preparation method thereof, in particular to a preparation method of an electrolyte for an electrochemical capacitor capable of producing high specific capacitance. Background technique [0002] In terms of its performance, supercapacitors are an energy source between traditional capacitors and batteries, and their electricity storage mechanisms include electric double layer capacitance mechanisms and Faraday quasi-capacitance mechanisms. However, regardless of the storage mechanism, the electrolyte is electrochemically inert, and no chemical reactions can occur except for providing a large number of positive and negative ions and charge conduction. Inorganic electrolytes such as KOH, Na 2 SO 4 , KCl, NaCl, LiCl, etc. have good electrical conductivity. But for porous carbon electrode materials, its single electric double layer capacitance mechanism makes the specific capacitance of a single electrode not...

Claims

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Application Information

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IPC IPC(8): H01G9/035
CPCY02E60/13
Inventor 李开喜李强
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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