Water system symmetrical electrochemical capacitor based on rice husk porous carbon

A porous carbon and symmetrical technology, applied in the field of electrochemistry, can solve the problems of toxicity, harsh environmental requirements, high cost, etc., and achieve the effect of simple operation, low price, and increased energy density

Inactive Publication Date: 2012-10-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, organic electrolytes are more costly than aqueous electrolytes, have harsh environmental requirements, and are toxic

Method used

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  • Water system symmetrical electrochemical capacitor based on rice husk porous carbon
  • Water system symmetrical electrochemical capacitor based on rice husk porous carbon
  • Water system symmetrical electrochemical capacitor based on rice husk porous carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The rice husk-based porous carbon, acetylene black and PTFE were evenly mixed in a mass ratio of 85:10:5, rolled into sheets, and pressed on foamed nickel to make capacitor electrodes with an electrode area of ​​1 cm 2 . A three-electrode system was adopted, the saturated calomel electrode (SCE) was used as the reference electrode, the Pt sheet was used as the auxiliary electrode, and the electrolytes were 6M KOH and 1M Na 2 SO 4 Aqueous solution, using PARSTAT 2273 electrochemical workstation to complete the test at 25 °C. The obtained cyclic voltammogram is shown in figure 1 As shown, at 1MNa 2 SO 4 In aqueous solution, the potential window of the rice husk-based porous carbon electrode is wider than that in 6M KOH aqueous solution.

Embodiment 2

[0018] Prepare rice husk-based porous carbon electrodes according to Example 1, select two activated carbon electrodes with equal mass as the positive and negative electrodes, assemble the positive electrode sheet, diaphragm, and negative electrode sheet into a compact structure, inject electrolyte, lead out the positive and negative electrode leads, and seal. 6M KOH aqueous solution and 1M Na 2 SO 4 The aqueous solution was used as the electrolyte, and assembled into an aqueous symmetric electrochemical capacitor, and its electrochemical performance was tested at 25°C using a PARSTAT 2273 electrochemical workstation. Charge and discharge performance such as figure 2 The energy density and power density of the assembled electrochemical capacitors under different charge and discharge currents are shown in Table 1. Using 1M Na 2 SO 4 The aqueous solution is an electrolyte, although the mass specific capacitance of the activated carbon is lost, but the energy density of the ...

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Abstract

The invention belongs to the technical field of electrochemistry, and relates to a symmetrical electrochemical capacitor which uses a sulphate water system electrolyte and takes the rice husk porous carbon as an electrode material, and has the maximum working voltage of 1.6V-1.8V. The water system symmetrical electrochemical capacitor consists of a positive electrode, a negative electrode, a membrane, an electrolyte, a positive wire, a negative wire and a shell, wherein the active materials of the positive and the negative poles are rice husk porous carbon, and the electrolyte adopts one or the mixed liquor of sodium sulfate, potassium sulfate, lithium sulfate and other sulphate aqueous solutions. The mass ratio of the positive and the negative electrodes is (1:1)-(1.5:1). The sodium sulfate, potassium sulfate, lithium sulfate and other sulphate aqueous solutions are adopted as the electrolyte, compared with adopting sulfate and potassium hydroxide electrolytes, the maximum working voltage of the electrochemical capacitor can be increased to 1.6-1.8V from about 1V, so the energy density of the water system symmetrical electrochemical electrical double-layer capacitor is greatly increased, and moreover, good stability is obtained; and compared with the organic electrolyte, the symmetrical electrochemical capacitor has the characteristics of low prices, no toxicity, no pollution, simplicity in operation and the like.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a symmetrical electrochemical capacitor using a sulfate salt electrolyte and using a rice husk-based porous carbon material as an electrode material. The maximum operating voltage can reach 1.6V-1.8V. Background technique [0002] Electrochemical capacitor is a kind of energy storage element between traditional capacitors and batteries, which has the advantages of short charging time, high Coulombic efficiency, high power, long life, and environmental friendliness, and has attracted widespread attention. [0003] Electrochemical capacitors are divided into electrochemical double layer capacitors and pseudocapacitive capacitors according to the principle of energy storage. The former uses the electric double layer formed by the charge separation between the electrode and the electrolyte interface to store energy, mainly using carbon materials as the electrode material; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/155H01G9/038H01G9/058H01G11/24H01G11/62H01G11/86
CPCH01G11/04H01G11/62Y02E60/13
Inventor 林海波闻斌郭玉鹏
Owner JILIN UNIV
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