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Porous carbon/manganese dioxide composite electrode, preparation method of porous carbon/manganese dioxide composite electrode 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: 2016-03-09
中国人民解放军军事科学院防化研究院
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  • Summary
  • 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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  • Porous carbon/manganese dioxide composite electrode, preparation method of porous carbon/manganese dioxide composite electrode 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 1mol / L manganese acetate and 1mol / L sodium sulfate to form an electrolytic cell with metal zinc flakes, adjust the pH to 5, and the solution is in a flowing state, and the selected potential value is 2.0Vvs.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, 1MZnSO 4 +1MNa 2 SO 4...

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 sheets, adjust the pH to 5, and the solution is in a flowing state, with a current of 10 mA, 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 material as the positive electrode and the zinc electrode as the negative electrode, 2MZnSO 4 +0.5MMnSO 4 T...

Embodiment 3

[0032] Mix graphene powder, conductive agent carbon black and binder polyvinylidene fluoride in a mass ratio of 8:1:1, coat it on a stainless steel mesh, cut it into a certain size, and dry it in a vacuum to form graphene electrode. Put the prepared graphene electrode into the solution containing 1mol / L manganese sulfate, 1mol / L sodium sulfate and metal zinc sheet to form an electrolytic cell, adjust the pH to 4.5, and the solution is in a flowing state, and the selected potential value is 2.0Vvs.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 material as positive electrode and zinc electrode as negative electrode, 1MZnSO 4 +1MNa 2 SO 4 +1MMnSO 4 The aqueous solution is used as electrolyte to assemble the battery, its specific capacity is 230mAh / g, and after 1000 times of charging and discharging, the capac...

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Abstract

The invention relates to a porous carbon / manganese dioxide composite electrode, a preparation method of the porous carbon / manganese dioxide composite electrode and a rechargeable zinc-manganese ion battery, and belongs to the technical field of electrochemistry. Porous carbon with high specific surface area and favorable electric conductivity is taken as a carrier electrode; the carrier electrode is electrolyzed in flowing water solution which contains a manganous salt precursor and a supporting electrolyte; and manganese dioxide is deposited on the surface of the porous carbon. Through selecting the concentration of the manganous salt as well as the concentration, pH value, current, temperature and time of the supporting electrolyte in the electric deposition process, a porous carbon / manganese dioxide composite is prepared, so that the regulation and control of the particle size and distribution density of the manganese dioxide are realized, and the active substance utilization rate of the manganese dioxide is improved. By taking the obtained porous carbon / manganese dioxide composite as the electrode, and by using the water solution containing zinc and manganese ions as electrolyte to assemble secondary batteries, the specific capacity of the electrode is above 200mAh / g and the electrode has the characteristics of being high in capacity and long in service life. The preparation method is easy to operate, green and environmental.

Description

Technical field [0001] The invention involves a porous carbon / manganese dioxide composite material electrode, its preparation methods and rechargeable zinc -manganese ion batteries, which are the field of electrochemical technology. Background technique [0002] In today's society, insufficient fossil energy supply has become a bottleneck for global economic development.At the same time, the use of environmental pollution caused by fossil energy is also increasingly serious. Actively develop and use renewable new energy and scale storage technology to build smart grids is the only way to reduce human dependence on fossil energy and purifying the environment.Battery -based chemical power storage technology is the prerequisite and foundation of renewable energy power generation, and its demand is urgent.The existing chemical energy storage batteries mainly include lead -acid batteries, nickel -metal hydride batteries, liquid flow batteries, and lithium ion batteries with organic me...

Claims

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Application Information

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Patent Type & Authority Applications(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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