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Method for preparing non-symmetrical electrochemical supercapacitor and electrode materials

A technology for supercapacitors and electrode materials, which is applied in the fields of material science and electrochemical technology science, can solve the problems of expensive precious metals and limited industrial application, achieve high crystallinity, good display properties, and overcome the effect of low working voltage

Active Publication Date: 2012-09-05
青岛生物能源与过程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) Electrochemical supercapacitors, which are composed of noble metals and noble metal oxide electrodes, the generation of capacitance is based on the underpotential deposition of electroactive ions on the surface of noble metals, or the generation of electroactive ions on the surface of noble metal oxide electrodes and in the bulk phase Adsorption capacitance produced by oxidation-reduction reaction, but due to the extremely expensive price of precious metals, its industrial application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]Crush commercially available petroleum coke, pass through a 100-mesh sieve after drying; dissolve 20g of activator NaOH in deionized water, add it to a stainless steel activation boat containing 5g of petroleum coke powder, mix well, soak for 24 hours, and place in a tubular activation In the furnace, under the protection of nitrogen, the temperature was raised to 800°C for 3 hours at a heating rate of 5°C / min, and then naturally lowered to room temperature; the obtained activated carbon was first washed with 5wt% hydrochloric acid, and then repeatedly washed with deionized water to medium sex. Take 2 g of the activated carbon obtained above in a graphite crucible, place it in a graphitization furnace under the protection of argon at a constant temperature of 2000° C. for 2 hours, and then cool it down to room temperature to take the material.

[0048] The above-mentioned activated carbon and graphitized activated carbon were mixed with conductive carbon black and PVDF b...

Embodiment 2

[0050] The graphitization temperature in Example 1 was changed to 1800° C., and other conditions were the same as in Example 1. The test results are shown in Table 1.

Embodiment 3

[0052] The graphitization temperature in Example 1 was changed to 2800° C., and other conditions were the same as in Example 1. The test results are shown in Table 1.

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Abstract

The invention relates to a method for preparing a non-symmetrical electrochemical supercapacitor and electrode materials, and the method comprises the steps of crushing petroleum coke, drying, mixing with an activator according to the proportion, heating, activating, cooling, then using hydrochloric acid for washing, and further using deionized water for washing prepared activated carbon till neutral; carrying out high-temperature graphitization on the obtained activated carbon; and adopting the activated carbon and the graphitized activated carbon for producing a positive electrode and a negative electrode respectively, and finally assembling the non-symmetrical electrochemical supercapacitor. The method can improve the working voltage by 1.1V and improve the specific energy by 8.2 timesin comparison with the method of assembling an electric double-layer capacitor by adopting the pure activated carbon, and be used for producing the electrochemical supercapacitor with high specific energy, high power and long service life.

Description

technical field [0001] The invention belongs to the fields of material science and electrochemical technology science, and in particular relates to a preparation method of an electrode material of an asymmetric electrochemical supercapacitor. [0002] The invention also relates to a method for preparing an asymmetric electrochemical supercapacitor with the above-mentioned electrode material. Background technique [0003] Electrochemical capacitor is a new, efficient and practical electrochemical energy storage device, which has the advantages of high power density, high energy density, long cycle life, and no pollution. It is widely used in electric / hybrid vehicles, mobile energy storage devices , industrial power management and composite power systems and other modern high-tech fields. [0004] According to different energy storage mechanisms, electrochemical supercapacitors can be divided into: [0005] (1) Electric double-layer capacitors, whose capacitance is mainly ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/058H01G9/155H01G9/038H01G11/34H01G11/62
CPCY02E60/13H01G11/22H01G11/58
Inventor 崔光磊韩鹏献王海波陈骁刘志宏
Owner 青岛生物能源与过程研究所
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