Method of preparing activated carbon/cobalt hydroxide composite electrode material

A composite electrode, cobalt hydroxide technology, used in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., can solve the problem of unsatisfactory capacitance rate characteristics and cycle performance, low specific surface area utilization, and uneven pore size distribution. and other problems, to achieve the effect of increasing porosity, beautiful appearance, and short experiment time.

Inactive Publication Date: 2017-07-21
徐俊鸽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cobalt hydroxide, as a new type of electrode material for supercapacitors, has received more and more attention due to its high electrochemical activity, low cost and environmental friendliness, but its poor conductivity will lead to its use as an electrode The capacitance rate characteristics and cycle performance are not satisfactory, while activated carbon has a high specific surface area and conductivity, and also has good cycle performance. After tens of thousands of charge and discharge cycles, the capacity still remains above 90%. It is currently the most widely used supercapacitor electrode material. Adding activated carbon to cobalt hydroxide to make a composite electrode material can effectively improve the electrical properties of the e

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a, utilize ginkgo leaf to prepare activated carbon, after ginkgo leaf is washed and dried, cut into fragments, then pulverized to a particle size of 1 mm through a pulverizer, and set aside;

[0032] B, immerse the ginkgo leaf obtained in step a into the sulfuric acid solution for ultrasonic treatment for 2h, wash and dry, and set aside, the concentration of the sulfuric acid is 2mol / L, and the ultrasonic treatment is multi-stage setting, first ultrasonic 30 ~ 40min, ultrasonic The frequency is 30KHz, and the Ginkgo biloba leaves are roughly cleaned by low-frequency ultrasound. 50 KHz, this setting enables the impurities in the Ginkgo biloba to be cleaned more thoroughly, and an excessively high ultrasonic frequency will affect the internal structure of the Ginkgo biloba;

[0033] C, the ginkgo leaf obtained in step b is placed in the tube furnace, with N 2 As a protective gas, N 2 The flow rate is 10L / h, at a heating rate of 6°C / min, the temperature is first raised t...

Embodiment 2

[0044] a, utilize ginkgo leaf to prepare activated carbon, after ginkgo leaf is washed and dried, cut into fragments, then pulverized to a particle size of 1 mm through a pulverizer, and set aside;

[0045] B, the ginkgo leaf that obtains in step a is immersed in the sulfuric acid solution after supersonic treatment 3h, wash and dry, for subsequent use, the concentration of described sulfuric acid is 3mol / L;

[0046] C, the ginkgo leaf obtained in step b is placed in the tube furnace, with N 2 As a protective gas, N 2 The flow rate is 10L / h, with a heating rate of 8°C / min, the temperature is first raised to 350°C, carbonized at low temperature for 2 hours, then heated to 600°C, carbonized for 2 hours, and finally heated to 750°C, carbonized at high temperature for 2 hours, kept for 1 hour, and then Cool to room temperature, take out the product, wash and dry, and obtain the charred material for subsequent use;

[0047] d. Immerse the carbonized material obtained in step c in...

Embodiment 3

[0057] a, utilize ginkgo leaf to prepare activated carbon, after ginkgo leaf is washed and dried, cut into fragments, then pulverized to a particle size of 2 mm through a pulverizer, and set aside;

[0058] B, the ginkgo leaf that obtains in step a is immersed in the sulfuric acid solution after supersonic treatment 4h, wash and dry, for subsequent use, the concentration of described sulfuric acid is 4mol / L;

[0059] C, the ginkgo leaf obtained in step b is placed in the tube furnace, with N 2 As a protective gas, N 2 The flow rate is 10L / h, at a heating rate of 10°C / min, the temperature is first raised to 400°C, carbonized at low temperature for 3 hours, then heated to 700°C, carbonized for 3 hours, and finally heated to 800°C, carbonized at high temperature for 3 hours, held at high temperature for 1 hour, and then Cool to room temperature, take out the product, wash and dry, and obtain the charred material for subsequent use;

[0060] d. Immerse the carbonized material ob...

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Abstract

As a new type of energy storage element, supercapacitors have the advantages of higher power, faster charging and discharging, longer life and lower maintenance costs compared with traditional physical capacitors and batteries, among which excellent electrode materials are the core. The invention provides a method for preparing an activated carbon/cobalt hydroxide composite electrode material. The activated carbon prepared by using ginkgo biloba biomass resources has larger pores and better specific surface area utilization, thereby increasing the electrochemical performance of cobalt hydroxide , to increase its rate performance and make it have better cycle stability.

Description

technical field [0001] The invention belongs to a composite electrode material in the technical field of supercapacitor devices, and in particular relates to a preparation method of an activated carbon / cobalt hydroxide composite electrode material. Background technique [0002] As a new type of energy storage element, supercapacitors have the advantages of higher power, faster charging and discharging, longer life and lower maintenance costs compared with traditional physical capacitors and batteries, among which excellent electrode materials are the core. At present, cobalt hydroxide, as a new type of electrode material for supercapacitors, has received more and more attention due to its high electrochemical activity, low cost and environmental friendliness, but its poor conductivity will lead to its use as an electrode The capacitance rate characteristics and cycle performance are not satisfactory, while activated carbon has a high specific surface area and conductivity, a...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/34
CPCY02E60/13H01G11/86H01G11/30H01G11/34
Inventor 徐俊鸽
Owner 徐俊鸽
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