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Preparation method and application of a carbon material/redox electrolyte composite material

A technology of composite materials and carbon materials, which is applied in the field of preparation of carbon materials/redox electrolyte composite materials, can solve the problems of low volume specific capacitance and low packing density of active materials of electrochemical capacitors, achieve high-quality specific capacitance and improve quality Specific capacitance and volume specific capacitance, the effect of broad application prospects

Active Publication Date: 2020-03-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of low bulk density and low volume specific capacitance of the existing electrochemical capacitor active materials, the purpose of the present invention is to provide a preparation method and application of a carbon material / redox electrolyte composite material, through the close-packed carbon material Redox electrolytes are introduced into the electrode, and the mass specific capacitance and volume specific capacitance of the electrode are improved at the same time.

Method used

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  • Preparation method and application of a carbon material/redox electrolyte composite material
  • Preparation method and application of a carbon material/redox electrolyte composite material
  • Preparation method and application of a carbon material/redox electrolyte composite material

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Embodiment 1

[0039] A kind of preparation method of graphene / redox electrolyte composite material, comprises the steps: 4g graphite powder is joined in the concentrated sulfuric acid (92mL) that places ice-water bath, stirs; Subsequently, add 9gKMnO 4 Carry out reaction (reaction temperature is 50 ℃); Treat that after reaction finishes, add H 2 o 2 Reduction of unreacted substances; centrifugation and dialysis to obtain graphene aqueous solution. Take 10 mL of the prepared graphene aqueous solution (solid content is 8 mg / mL), 10 mL of deionized water and 165 mg of potassium iodide powder, transfer to a 25 mL polytetrafluoroethylene reactor for hydrothermal reaction, and obtain graphene hydrogel. The reaction temperature was 180°C, and the reaction time was 6 hours. Put the graphene hydrogel in a drying oven and dry it in a vacuum environment at 60°C for 12 hours. Subsequently, the obtained material was washed with deionized water and dried at 60° C. to obtain a graphene / potassium iodide...

Embodiment 2

[0041] The graphene / potassium iodide composite material that embodiment 1 is made is as working electrode (80wt.% graphene, 10wt.% conductive additive, coating 316 stainless steel current collectors after 10wt.% binding agent mixes uniformly), and platinum sheet is as counter electrode electrode, silver chloride as reference electrode, in 1M H 2 SO 4 In the electrolyte, it is assembled into a three-electrode system to test the electrochemical performance of the electrodes. figure 2 It is the cyclic voltammetry curve of the electrode at a scan rate of 0.5mV / s. After testing, the electrode has an obvious redox peak at a potential of 0.4V (vs.Ag / AgCl), and its mass specific capacitance is 222F g -1 , the volume specific capacitance is 290F L -1 . Figure 4 It is the impedance spectrum of high-density graphene electrode and graphene / redox electrolyte composite electrode, after testing this graphene / potassium iodide composite material has the charge transfer impedance ( Figur...

Embodiment 3

[0043] The graphene / potassium iodide composite material that embodiment 1 is prepared is prepared as electrode (80wt.% graphene, 10wt.% conductive additive, 10wt.% binder is coated with 316 stainless steel current collector after mixing uniformly), and simultaneously as positive Negative electrode (mass ratio of positive and negative electrodes is 1 to 1), and 1M H 2 SO 4 The electrolyte and the glass fiber diaphragm are assembled into a supercapacitor. Image 6 It is the cyclic voltammetry curve of the supercapacitor under the voltage window of 0-1.4V, and the mass energy density of the supercapacitor is tested to be 39Whkg -1 , the volumetric energy density can reach 50.7Wh L -1 .

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Abstract

The invention, which belongs to the field of energy materials, discloses a preparation method and application of a carbon material / redox electrolyte composite material. A carbon material and a redox electrolyte are used as raw materials;and liquid-phase mixing, gelatinization, and vacuum drying are carried out to obtain a composite material. The composite material has the high volume density; because of filling in micropores of the carbon material by the redox electrolyte, the density of the electrode material is enhanced and the high specific surface area is kept. Besides, the redox electrolyte can be used for providing an electrical double-layer capacitor and a pseudocapacitor. The composite material having both high mass and volume specific capacitance can be used as an active materialfor an electrochemical capacitor.

Description

Technical field: [0001] The invention belongs to the technical field of energy materials, and in particular relates to a preparation method and application of a carbon material / redox electrolyte composite material. Background technique: [0002] The rapid development of portable electronic devices and electric vehicles has put forward higher requirements for the volumetric energy density of electrochemical energy storage devices. Electrochemical capacitors rely on the adsorption of double-layer ions on the electrode surface or redox reactions to store charges. They have the advantages of fast charging and discharging, and a cycle life of tens of thousands of times. They are one of the mainstream devices currently used. However, the low volume energy density limits the wide application of electrochemical capacitors. How to further increase the volume energy density of electrochemical capacitors while maintaining the advantages of electrochemical capacitors is an urgent proble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/86
CPCH01G11/24H01G11/32H01G11/86Y02E60/13
Inventor 李峰王宇作单旭意孙振华成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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