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Modification method for cathode activated charcoal of ultracapacitor

A technology of supercapacitors and modification methods, which is applied in the direction of capacitors, capacitor manufacturing, electrolytic capacitors, etc., and can solve the problems of low capacity and high capacity

Inactive Publication Date: 2004-03-17
江苏隆源双登电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The positive electrode of the hybrid supercapacitor has a Faraday reaction during the charging and discharging process, and its capacity is very high; while the negative electrode mainly relies on the charge separation between the electrode and the solution interface during the charging and discharging process, that is, the electric double layer capacitance to store energy, so its The capacity is low, it is difficult to match the capacity of the positive electrode

Method used

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  • Modification method for cathode activated charcoal of ultracapacitor

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Effect test

Embodiment 1

[0010] Embodiment 1: Barium sulfate is as the active center of lead phosphate

[0011] At room temperature, the pretreated activated carbon was mixed with 1 mol / l Pb(NO 3 ) 2 Vacuum soak in the solution for 3 hours, dry at 100°C for 2 hours after suction filtration, then add excess 0.05mol / l phosphoric acid solution and vacuum soak for 5 hours. 3 (PO 4 ) 2 The modified layer was washed with water and filtered until the pH was greater than 6.5, and dried at 100° C. for 6 hours to complete the lead phosphate modification.

[0012] The activated carbon modified by lead phosphate was mixed with 0.03mol / l Ba(NO 3 ) 2 Vacuum impregnation in the solution at room temperature for 3 hours, suction filtration, drying at 100°C for 2 hours, and then adding an excess of 0.05 mol / l K 2 SO 4 The solution was vacuum impregnated for 5 hours, at which time a layer of nanoscale BaSO was deposited in the micropores of the activated carbon. 4 The modified layer was washed with water and suc...

Embodiment 2

[0013] Embodiment 2: barium sulfate is as the active center of lead sulfate

[0014] At room temperature, the pretreated activated carbon was mixed with 1 mol / l Pb(NO 3 ) 2 Vacuum impregnated in the solution for 3 hours, dried at 100°C for 2 hours after suction filtration, and then added excess density of 1.3g / cm 3 The sulfuric acid solution was vacuum impregnated for 5 hours, at which time a layer of nanoscale PbSO was deposited in the micropores of the activated carbon 4 The modified layer was washed with water and filtered until the pH was greater than 6.5, and dried at 100° C. for 6 hours to complete the lead sulfate modification.

[0015] The activated carbon modified by lead sulfate was mixed with 0.03mol / l Ba(NO 3 ) 2 Vacuum impregnation in the solution at room temperature for 3 hours, suction filtration, drying at 100°C for 2 hours, and then adding an excess of 0.05 mol / l K 2 SO 4 The solution was vacuum impregnated for 5 hours, at which time a layer of nanoscale...

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Abstract

A process for the modification of activated charcoal material for the use of super capacitor negative electrode, wherein a nanometer level lead phosphate or lead sulfate modification layer is first formed in the activated charcoal micropore, then the barium sulfate reactive center is redeposited. After modification, the capacity of the active compound is increased by about 67%, the electrochemical window is expanded by 150 mV, thus improving the weight ratio energy capacity of the assortment type super capacitor. íí

Description

technical field [0001] The invention relates to a method for modifying an activated carbon material for a negative electrode of a hybrid supercapacitor, belonging to the field of supercapacitors. Background technique [0002] A supercapacitor is an excellent compact energy source located between batteries and traditional capacitors. It has large energy storage, light weight, large specific capacity, large specific power (1500W / kg), good high-current discharge performance, and fast charging ( It can be several seconds), and the number of cycles is large (in the order of 10 5 Meter), low temperature resistance (-50 ℃), maintenance-free, low pollution and other outstanding advantages, it can be used as an independent power supply or a compound power supply, and is widely used in the fields of starting, traction power, pulse discharge and backup power supply. [0003] The positive electrode currently used in hybrid supercapacitors is a specially designed nickel hydroxide electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G11/86
CPCY02E60/13
Inventor 阎智刚褚德威熊廷玉祝士平管雄俊陈怀林
Owner 江苏隆源双登电源有限公司
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