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Preparation method of activated carbon/metal nitride composite electrode material for supercapacitor

A composite electrode and activated carbon technology, applied in the fields of material science and electrochemical technology science, can solve the problems of low energy density, expensive precious metals, narrow working voltage window, etc., and achieve good comprehensive performance, simple process and remarkable effect

Inactive Publication Date: 2011-05-18
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

[0005] (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 high price of precious metals, its industrial application is limited
[0007] In order to improve the specific capacitance of carbon materials, Chinese patents CN101221854A, CN1402272, CN1404082A, etc. use activated carbon to load MxOy (M represents Ni, Co, Mn, Al, Zn, etc.) and Chinese patent CN1482634 to load lead compounds, but these materials are used in water-based In the electrolyte system, although the specific capacitance has been increased, the working voltage window is narrow (0-1V), and the energy density is low

Method used

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  • Preparation method of activated carbon/metal nitride composite electrode material for supercapacitor
  • Preparation method of activated carbon/metal nitride composite electrode material for supercapacitor

Examples

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Effect test

Embodiment 1

[0025] V at room temperature 2 o 5 Dissolve in deionized water and hydrogen peroxide, prepare 100ml of a solution with a weight concentration of 1wt%, add 1g of activated carbon (commercially available) while stirring, continue stirring for 3h, then oscillate ultrasonically for 24h to form a gel, and dry the sample at 80°C for 24h , the dried sample was placed in a tubular atmosphere furnace, and heated at a rate of 5 °C / min to 600 °C for 5 h in an ammonia atmosphere to obtain an activated carbon electrode material loaded with vanadium nitride. The obtained composite material was mixed with conductive carbon black and PVDF binder in a ratio of 85:10:5, coated on copper foil, punched into pole pieces, and mixed with 1mol / L LiPF 6 / (EC:DMC) is the electrolyte, assembled into a button capacitor, the charge and discharge voltage is 0-3V, and the current density is 0.5A / g. The test results are shown in Table 1.

Embodiment 2

[0027] Butyl titanate (Ti(OC 4 h 9 ) 4 ) was dissolved in absolute ethanol to make a solution with a weight concentration of 1wt%. This solution was added dropwise to a mixed solution of vigorously stirred distilled water and 1g of activated carbon (commercially available), and butyl titanate was hydrolyzed to control titanium dioxide. The molar ratio of butyl acetate to distilled water is 1:150. After the precipitate generated by hydrolysis was filtered, washed twice with distilled water and twice with absolute ethanol, and then dried at 80° C. for 24 h. The sample was placed in a tubular atmosphere furnace and calcined at 5°C / min to 450°C for 4h under the protection of nitrogen, then switched to ammonia gas, heated to 1000°C at 5°C / min, and heat-treated for 5h to obtain titanium nitride-loaded Activated carbon electrode material. The assembly and testing of the button capacitor are the same as in Example 1, and the test results are shown in Table 1.

Embodiment 3

[0029] Cr(NO 3 ) 3 9H 2 O was dissolved in absolute ethanol to form a solution with a weight concentration of 1 wt%, and 1 g of activated carbon (commercially available) was added under stirring, and then saturated urea-ethanol solution was added dropwise under stirring to keep the temperature of the solution at about 80 °C , until the final weight ratio of urea nitrate reached 1:9, the mixture was dried at 80°C for 24h, the dried sample was placed in a tubular atmosphere furnace, and the temperature was increased to 5°C / min under an ammonia atmosphere. Heat treatment at 600° C. for 5 h to obtain an activated carbon electrode material loaded with chromium nitride. The assembly and testing of the button capacitor are the same as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention relates to a preparation method of an activated carbon / metal nitride composite electrode material for the supercapacitor. The method comprises the following steps: mechanically mixing metal, metal oxide, organic metal complex or metal salt and activated carbon, drying and performing heat treatment to a sample at 300-1300 DEG C under nitrogen atmosphere or the mixed gas atmosphere of nitrogen and hydrogen, wherein the weight of metal, metal oxide, organic metal complex or metal salt accounts for 0.5-10% of the total weight. The specific energy of the metal nitride-loaded activated carbon composite electrode material prepared by the invention is 1.7-3.1 times of that of the pure activated carbon electrode. The activated carbon / metal nitride composite electrode material has the advantages of simple preparation method, low cost, excellent performance and the like and is an electrochemical supercapacitor electrode material with wide prospect.

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 and application of an activated carbon electrode material loaded with metal nitrides for an electrochemical supercapacitor. Background technique [0002] Electrochemical supercapacitor 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. [0003] According to different energy storage mechanisms, electrochemical supercapacitors can be divided into: [0004] (1) Electric double-layer capacitors, whose capacitance is mainly based on the electric double-layer capacitance generated by the separation of charges on the electrod...

Claims

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Application Information

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IPC IPC(8): H01G9/058H01G11/86
CPCY02E60/13
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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