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Green composite double electric layer electrochemical capacitor

A composite electric double layer and capacitor technology, which is applied in the manufacture of hybrid/electric double layer capacitors, electrolytic capacitors, hybrid capacitor electrodes, etc. The problem of low charging and discharging efficiency of asymmetric capacitors has the effect of suppressing self-discharge, improving energy density and safety performance, and improving safety and stability.

Inactive Publication Date: 2009-12-30
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the rate of energy storage through redox reactions is much lower than that through the electric double layer, the improvement of the energy density of asymmetric electrochemical capacitors is at the expense of its power density, which is affected by the oxidation of electrode active materials. Due to the influence of the reduction reaction rate, it is difficult for asymmetric electrochemical capacitors to have super high power performance
Furthermore, the high-capacity active material will gradually fail after repeated deep redox reactions, which will directly affect the cycle life of the asymmetric capacitor, which is comparable to the cycle life of ordinary carbon-electrode double-layer capacitors of more than 100,000 times. relatively large distance
Affected by its energy storage mechanism, the charge and discharge efficiency of asymmetric capacitors is low, generally lower than 85%, which is not economical for the use of energy
In addition, Ni(OH) 2 The price of such high-energy active materials is higher than that of activated carbon, and a large amount of use will increase the production cost of electrochemical capacitors

Method used

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  • Green composite double electric layer electrochemical capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Activated carbon powder, LaNi 5 Type hydrogen storage alloy powder, graphite, and polytetrafluoroethylene emulsion are mixed at a mass ratio of 70:15:10:5, and composite electrochemical capacitors are prepared by slurry preparation, smearing, vacuum drying, sheeting, and vacuum impregnation of electrolyte. Negative electrode; activated carbon powder, Ni(OH) 2 , graphite, and polytetrafluoroethylene emulsion are mixed in a mass ratio of 73:12:10:5, and the positive electrode of an electrochemical capacitor is prepared by processes such as pulping, smearing, vacuum drying, sheeting, and vacuum impregnation of electrolyte. 20-40% KOH solution is used as the electrolyte, polypropylene non-woven fabric is used as the diaphragm, and assembled into a simulated capacitor. The constant current charge and discharge test is carried out at different current densities in the range of 0-1.2V. After 50 cycles, the capacitor performance is stable and its capacity is recorded. , throug...

Embodiment 2

[0024] Activated carbon powder, MmNi 5 (Mm is mixed rare earth) type hydrogen storage alloy powder, battery acetylene black, and polytetrafluoroethylene emulsion are mixed in a ratio of 70:15:10:5, and the mixture is prepared by mixing, smearing, vacuum drying, pressing, and vacuum impregnating the electrolyte. and other processes to prepare composite electrochemical capacitor negative electrode; activated carbon powder, Ni(OH) 2 , battery acetylene black, and polytetrafluoroethylene emulsion are mixed in a ratio of 73:12:10:5, and the positive electrode of the electrochemical capacitor is prepared through processes such as pulping, smearing, vacuum drying, pressing, and vacuum impregnating electrolyte. The mixed solution of 30% KOH and 10% LiOH is used as the electrolyte, and the polypropylene non-woven fabric is used as the diaphragm to assemble a simulated capacitor. The constant current charge and discharge test is carried out at different current densities in the range of...

Embodiment 3

[0026] Activated carbon powder, LaNi5 type hydrogen storage alloy powder, nano-scale acetylene black, and polytetrafluoroethylene emulsion are mixed in a ratio of 70:15:10:5, and are prepared by mixing, smearing, vacuum drying, pressing, vacuum impregnating electrolyte, etc. process to prepare composite electrochemical capacitor negative electrode; activated carbon powder, Ni(OH) 2, nano-scale acetylene black, and polytetrafluoroethylene emulsion are mixed in a ratio of 73:12:10:5, and the positive electrode of an electrochemical capacitor is prepared through processes such as pulping, smearing, vacuum drying, sheeting, and vacuum impregnation of electrolyte. 20-40% KOH solution is used as the electrolyte, polypropylene non-woven fabric is used as the diaphragm, and it is installed as a simulated capacitor, and the constant current charge and discharge test is carried out at different current densities in the range of 0-1.3V. After 50 cycles, the capacitor performance is stable...

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Abstract

Adding certain amount of high-capacity performance active matter to the two electrodes of single-body double-electric layer electrochemical capacitor can raise the stable work voltage of electrochemical capacitor with alkali aqueous solution, obtain single-electrode specific capacitance, and thus improve the specific energy property and safety performance of single-body double-electric layer electrochemical capacitory. The energy density may be increased by 45-70 % depending on the added active matter ratio and the selected work voltage while depressing the high self-discharging of double-electric layer capacitor. The present invention may further apply novel nanometer level conducting material to result in ever superior conducting performance of electrode and ever improved charging and discharging performance of the electrochemical capacitor.

Description

technical field [0001] The invention belongs to the field of novel green composite electrochemical capacitors. Background technique [0002] Electrochemical capacitors, also known as supercapacitors, are new electrical energy storage devices developed in recent years between traditional capacitors and secondary batteries. It has excellent pulse charge and discharge performance and high storage performance (capacity is 20-200 times that of traditional capacitors) that traditional physical capacitors do not have. It is superior to general secondary batteries. The emergence of electrochemical capacitors can make up for the shortcomings of traditional energy storage devices and replace traditional energy storage devices in some fields. Such as providing memory support in the field of microelectronics, providing megawatt-level extra-high power in laser weapons in the military field or in the startup of tanks and submarines, as the ignition power source of fuel cells, and as pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/058H01G9/042H01G9/155H01G9/035H01G9/02H01G11/30H01G11/86
CPCY02E60/13
Inventor 吴锋苏岳锋赵淑红陈实王国庆单忠强毛立彩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY