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A kind of porous carbon/manganese dioxide composite material electrode, its preparation method and rechargeable zinc-manganese ion battery

A manganese dioxide and composite material technology, applied in the field of electrochemistry, can solve the problems of poor rate performance, poor conductivity, large particle size, etc., and achieve the effects of increasing the active specific surface, improving the filling rate, and improving the utilization rate.

Active Publication Date: 2018-03-09
中国人民解放军军事科学院防化研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose a porous carbon / manganese dioxide composite material electrode, its Preparation method and rechargeable zinc-manganese ion battery

Method used

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  • A kind of porous carbon/manganese dioxide composite material electrode, its preparation method and rechargeable zinc-manganese ion battery

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Experimental program
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Effect test

Embodiment 1

[0028] Stainless steel mesh with a cutting area of ​​20×20mm and graphite felt with a cutting area of ​​20×20×1mm are used as the substrate and porous carbon carrier electrode respectively. The graphite felt is bonded to the stainless steel substrate electrode with graphite emulsion conductive adhesive, and the metal tab is welded on the stainless steel mesh. , to make the working electrode. Put the prepared graphite felt electrode into a solution containing 1 mol / L manganese acetate and 1 mol / L sodium sulfate to form an electrolytic cell with a metal zinc sheet, adjust the pH to 5, and the solution is in a flowing state, and the selected potential value is 2.0 V vs .Zn / Zn 2+ , and performed potentiostatic electrolysis at room temperature for 1 h. The electrode was taken out, washed with deionized water, dried, and weighed. With the obtained graphite felt / manganese dioxide composite electrode as positive electrode and zinc electrode as negative electrode, 1M ZnSO 4 +1M Na ...

Embodiment 2

[0030] 0.25 g of commercial carbon nanotubes were heated and mixed in a mixed acid solution of sulfuric acid and nitric acid (volume ratio 3:1) for purification, and then washed and dried. Add 5% binder PTFE to the dried carbon nanotubes, roll them into sheets, and press the pole pieces with a cutting area of ​​20×20 mm on a stainless steel mesh, and dry them in a vacuum to form carbon nanotube electrodes. Put the prepared carbon nanotube electrode into a solution containing 0.5 mol / L manganese sulfate and 1 mol / L sodium sulfate to form an electrolytic cell with metal zinc sheet, adjust the pH to 5, and the solution is in a flowing state, with a current of 10mA, room temperature Under constant current electrolysis for 2.5 hours. The electrode was taken out, washed with deionized water, dried, and weighed. With the obtained carbon nanotube / manganese dioxide composite as the positive electrode and the zinc electrode as the negative electrode, 2MZnSO 4 +0.5M MnSO 4 The aqueous...

Embodiment 3

[0032] Graphene powder, conductive agent carbon black and binder polyvinylidene fluoride are mixed in a mass ratio of 8:1:1 and then coated on stainless steel mesh, cut into a certain size, and dried in a vacuum to form graphene electrode. Put the prepared graphene electrode into a solution containing 1 mol / L manganese sulfate and 1 mol / L sodium sulfate to form an electrolytic cell with a metal zinc sheet, adjust the pH to 4.5, and the solution is in a flowing state, and the selected potential value is 2.0 Vvs. Zn / Zn 2+ , at room temperature for 2 h at constant potential pulse electrolysis. The electrode was taken out, washed with deionized water, dried, and weighed. With the obtained graphene / manganese dioxide composite as positive electrode and zinc electrode as negative electrode, 1M ZnSO 4 +1M Na 2 SO 4 +1M MnSO 4 The aqueous solution is used as the electrolyte to assemble the battery, its specific capacity is 230 mAh / g, and the capacity retention rate is over 80% af...

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Abstract

The invention relates to a porous carbon / manganese dioxide composite electrode, a preparation method thereof and a rechargeable zinc-manganese ion battery, belonging to the technical field of electrochemistry. In the invention, the porous carbon with high specific surface area and good conductivity is used as a carrier electrode, electrolyzes in the flowing aqueous solution containing manganese salt precursor and supporting electrolyte, and manganese dioxide is electrodeposited on the surface of the porous carbon. Through the selection of the concentration of manganese salt, the concentration of supporting electrolyte, pH value, current, temperature and time in the electrodeposition process, the porous carbon / manganese dioxide composite material is prepared, and the particle size and distribution density of manganese dioxide can be adjusted. The utilization rate of active substances of manganese dioxide is improved. The obtained porous carbon / manganese dioxide composite material is used as an electrode, and the aqueous solution containing zinc and manganese ions is used as an electrolyte to assemble a secondary battery. The specific capacity of the electrode is above 200 mAh / g, which has the characteristics of high capacity and long life. Moreover, the preparation method is easy to operate and environmentally friendly.

Description

technical field [0001] The invention relates to a porous carbon / manganese dioxide composite electrode, a preparation method thereof and a rechargeable zinc-manganese ion battery, belonging to the technical field of electrochemistry. Background technique [0002] In today's society, the insufficient supply of fossil energy has become the bottleneck of global economic development. At the same time, the environmental pollution caused by the use of fossil energy is becoming more and more serious. Actively developing and utilizing renewable new energy and large-scale power storage technology and building a smart grid are the only ways to reduce human dependence on fossil energy and purify the environment. Battery-based chemical power storage technology is the premise and basis for realizing renewable energy power generation, and its demand is urgent. Existing chemical energy storage batteries mainly include lead-acid batteries, nickel-metal hydride batteries, flow batteries, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/50H01M4/139H01M10/38
CPCH01M4/139H01M4/362H01M4/50H01M4/583H01M10/38Y02E60/10Y02P70/50
Inventor 文越华程杰徐良申亚举赵鹏程徐艳曹高萍杨裕生
Owner 中国人民解放军军事科学院防化研究院
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