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Preparation method for cicada slough based porous carbon material used for electrochemical capacitor

A porous carbon material, electrochemical technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problem of low specific capacitance of ordinary activated carbon, to achieve the promotion of specific capacitance and energy density, high specific capacitance Value, the effect of increasing the specific capacitance value

Inactive Publication Date: 2015-12-16
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The content of the present invention relates to a method of preparing a porous carbon material with excellent electrochemical capacitance performance by using cicada slough as a raw material, so as to solve the problem of low specific capacitance value of ordinary activated carbon, and then promote energy storage in supercapacitors with high cost performance and high energy density Device development

Method used

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  • Preparation method for cicada slough based porous carbon material used for electrochemical capacitor
  • Preparation method for cicada slough based porous carbon material used for electrochemical capacitor
  • Preparation method for cicada slough based porous carbon material used for electrochemical capacitor

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Embodiment 1

[0025] Cicada slough was purchased from Nanjing Jinling Pharmacy Co., Ltd., and the obtained cicada slough was dried at 60°C and crushed until the size of the powder was larger than 10 mesh. First, the sediment in the crushed powder was cleaned with tap water, soaked in ethanol for 2 minutes, filtered and dried at 60°C. Dry in a dry oven; the dried cicadas are sloughed into powder, and nitrogen is used as a protective gas in a tube furnace at 10°C min -1 The heating rate was raised to 400°C and kept for 5 hours, and carbonaceous was obtained after natural cooling; the obtained carbonaceous and sodium hydroxide were uniformly mixed at a mass ratio of 1:1, and nitrogen was used as a protective gas. 10℃min -1 In order to raise the temperature to 900°C for further activation treatment and keep it for 2 hours, the activated product is obtained after natural cooling; the obtained activated product is neutralized with phosphoric acid, then cleaned with deionization to neutrality, and...

Embodiment 2

[0028] Cicada slough was purchased from Nanjing Jinling Pharmacy Co., Ltd., and the obtained cicada slough was dried at 65°C and crushed until the size of the powder was larger than 10 mesh. First, the sediment in the crushed powder was cleaned with tap water, soaked in ethanol for 5 minutes, filtered and dried at 65°C. Dried in a dry oven; the dried cicadas were sloughed into powder, and heated in a tube furnace at 4°C min with nitrogen as a protective gas. -1 The heating rate was increased to 500°C and kept for 1h, and the carbonaceous was obtained after natural cooling; the obtained carbonaceous and potassium hydroxide were uniformly mixed at a mass ratio of 1:3, and heated at 4°C min in a nitrogen atmosphere. -1 In order to increase the heating rate to 650°C, further activate the carbonaceous material and keep it for 1 hour, and obtain the activated product after natural cooling; neutralize the obtained activated product with hydrochloric acid, then wash it to neutral with ...

Embodiment 3

[0031] The preparation method of the cicada base porous carbon material is the same as that of Example 2.

[0032] Take 3 mg of the prepared porous carbon, mix them uniformly according to the mass ratio of active material: acetylene black: polytetrafluoroethylene = 80:15:5, and press the mixed slurry onto the foamed nickel current collector at a pressure of 15 MPa to form a Two identical supercapacitor single electrodes were used to perform electrochemical tests on two symmetrical working electrodes with 6.0MKOH as the electrolyte. Electrochemical tests show that at 0.5, 5, 10Ag -1 The specific capacitance under the current density is 335, 224, 202Fg -1 (attached Figure 4 B), still showing good rate performance.

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Abstract

The invention discloses a preparation method for cicada slough based porous carbon material capable of being used for an electrochemical capacitor. Cicada slough is adopted as a carbon source, an alkaline metal hydroxide is adopted as an activating agent, and the two steps of medium-temperature pre-carbonation and high-temperature activation are carried out, so that the cicada slough based porous carbon material for a high-performance supercapacitor is prepared; the prepared carbon material has the characteristics such as higher specific capacitance value, better cycle performance and higher multiplying power in a water system electrolyte, for example, in a 6.0 M KOH electrolyte, the weight specific capacitance value of the carbon material can reach 355 Fg<-1>, 288 Fg<-1> and 283 Fg<-1> respectively under the electric current density of 1 Ag<-1>, 10 Ag<-1> and 30 Ag<-1>, and after the carbon material is charged and discharged in a circulating manner for 3000 times under the condition of 10 Ag<-1>, the capacitance retention value of the carbon material is still 90% or above of the original value. According to the invention, biomass materials are fully utilized, the cost is low, the sources are wide, the preparation technology is simple, and the prepared porous carbon material has large specific surface area and excellent electrochemical capacitor performance, and has wide application prospect in the field of electrochemical energy storage.

Description

technical field [0001] The invention belongs to the field of preparation of porous carbon electrode materials, and in particular relates to a method for preparing porous carbon materials based on cicada slough that can be used for electrochemical capacitors. Background technique [0002] Electrochemical capacitors, also known as supercapacitors, are a new type of power energy storage device between traditional capacitors and secondary batteries. Compared with lead-acid, nickel-metal hydride, nickel-cadmium and lithium-ion batteries on the market, supercapacitors have the characteristics of fast charge and discharge, long cycle life, wide temperature range and high specific power. They are widely used in electronics, electrical appliances, communications, aerospace, etc. The field has a wide range of applications, and in the field of new energy vehicles, it has received more extensive attention. [0003] Electrode materials are the most important components of supercapacitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12H01G11/86H01G11/32
CPCY02E60/13
Inventor 谢骁贾海洋孙立涛
Owner SOUTHEAST UNIV
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