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Method for preparing element doped manganese dioxide electrode materials for super-capacitors

A manganese dioxide electrode, supercapacitor technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, manganese oxide/manganese hydroxide, etc. problem, to achieve the effect of low cost, high activity and specific capacity, and simple process

Inactive Publication Date: 2015-03-04
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for MnO 2 The research on the doping modification of non-metallic elements has not been reported yet

Method used

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  • Method for preparing element doped manganese dioxide electrode materials for super-capacitors
  • Method for preparing element doped manganese dioxide electrode materials for super-capacitors
  • Method for preparing element doped manganese dioxide electrode materials for super-capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 3.16g of potassium permanganate, 12.37g of boric acid and 1.73g of manganese acetate, dissolve them in 20ml, 10ml and 10ml of deionized water respectively, add the boric acid solution and manganese acetate solution to the potassium permanganate solution in sequence. Then the mixed solution was transferred to a hydrothermal reaction kettle, the hydrothermal reaction temperature was 120°C, and the reaction time was 12h. After the reaction, the reaction product was washed with ethanol and deionized water, and dried under vacuum at 80° C. for 12 hours. By adding carbon fiber cloth during the hydrothermal reaction, boron-doped MnO 2 directly deposited on carbon fiber cloth to prepare flexible composite supercapacitor electrodes. figure 1 It is the XRD pattern of the composite electrode, and the manganese oxide material is birnessite-MnO 2 . figure 2 It is the SEM picture of the composite electrode, it can be seen that MnO 2 3D network surface structure.

Embodiment 2

[0019] Weigh 3.16g of potassium permanganate, 0.00248g of boric acid and 1.73g of manganese acetate, dissolve them in 20ml, 10ml and 10ml of deionized water respectively, add the boric acid solution and manganese acetate solution to the potassium permanganate solution in sequence. Then the mixed solution was transferred to a hydrothermal reaction kettle, the hydrothermal reaction temperature was 120°C, and the reaction time was 12h. After the reaction, the reaction product was washed with ethanol and deionized water, and dried under vacuum at 80° C. for 12 hours. By adding carbon fiber cloth during the hydrothermal reaction, boron-doped MnO 2 directly deposited on carbon fiber cloth to prepare flexible composite supercapacitor electrodes. image 3 is the SEM image of the composite electrode. Compared with Example 1, the reduction of boron doping amount will obviously change the deposition method of manganese dioxide.

Embodiment 3

[0021] Weigh 3.16g of potassium permanganate, 2.48g of boric acid and 2.51g of manganese nitrate, dissolve them in 20ml, 10ml and 10ml of deionized water respectively, add the boric acid solution and manganese nitrate solution to the potassium permanganate solution in sequence. Then the mixed solution was transferred to a hydrothermal reaction kettle, the hydrothermal reaction temperature was 60° C., and the reaction time was 24 h. After the reaction, the reaction product was washed with ethanol and deionized water, filtered, and vacuum-dried at 60° C. for 24 hours.

[0022] Mix manganese dioxide, carbon black and polytetrafluoroethylene emulsion evenly in a mass ratio of 65:30:5, adjust it into a slurry, and evenly coat it on the foamed nickel, use a powder tablet press at a pressure of 15MPa Press down the tablet, and then put the electrode sheet into a vacuum oven at 120°C for 24 hours to vacuum dry. A saturated calomel electrode is used as a reference electrode, a 2×2 pla...

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Abstract

The invention discloses a method for preparing element doped manganese dioxide electrode materials for super-capacitors and belongs to the technical field of electrode materials. Particularly, the method comprises adding a borate solution and a divalent manganese salt solution into a potassium permanganate solution successively to be subjected to hydrothermal reaction, wherein the molar ratio between the divalent manganese salt and the potassium permanganate is 1: (0.5-5), the boron ion concentration is 0.001M-5M, the reaction temperature is in a range of 60 DEG C to 160 DEG C, and the reaction time is 1h-24h; washing reaction products with ethyl alcohol and de-ionized water respectively and performing vacuum drying on the washed reaction products for 4h to 24h in the temperature ranging from 60 DEG C to 120 DEG C. According to the method, the reaction condition is mild, the production cost is low, the technical route is simple and convenient, the activity and the specific capacity of the prepared manganese dioxide materials are high, the capacitive performance is good, and the cycling stability is high.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a method for preparing an element-doped manganese dioxide electrode material for supercapacitors. Background technique [0002] Supercapacitors can not only meet the needs of high power output such as electric vehicle start-up and acceleration, but also be used in low-power output occasions such as circuit components and small electrical appliances. It is a more advanced energy storage method. From the perspective of electrode materials, carbon materials (acetylene black, carbon nanotubes and graphene, etc.), organic conductive polymers and transition metal oxides (RuO 2 , MnO x , NiO x and CoO x Wait). Carbon material is the earliest application and the most successful supercapacitor electrode material in industrialization. However, the charge storage of carbon materials relies on the surface electric double layer structure, and its storage capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46
CPCY02E60/13H01G11/46C01G45/02C01P2004/03H01G11/86
Inventor 迟洪忠
Owner HANGZHOU DIANZI UNIV
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