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Preparation method of manganese dioxide/ carbon microspheres composite material and application of composite material serving as supercapacitor electrode material

A supercapacitor, manganese dioxide technology, applied in the field of electrochemical materials and composite materials, can solve the problems of poor cycle stability, low electrochemical utilization, poor conductivity, etc.

Inactive Publication Date: 2015-03-11
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MnO 2 The low specific capacitance and poor cycle stability have greatly limited its practical application, which is mainly attributed to its poor electrical conductivity and exfoliation caused by crystal expansion / contraction during repeated cycles. To make up for these deficiencies, conductive carbon material carbon microspheres can be used as support materials with MnO 2 form a complex
while pure MnO 2 Poor conductivity and low electrochemical utilization limit its application in extended capacitors

Method used

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  • Preparation method of manganese dioxide/ carbon microspheres composite material and application of composite material serving as supercapacitor electrode material
  • Preparation method of manganese dioxide/ carbon microspheres composite material and application of composite material serving as supercapacitor electrode material
  • Preparation method of manganese dioxide/ carbon microspheres composite material and application of composite material serving as supercapacitor electrode material

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Experimental program
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Effect test

Embodiment 1

[0047] (1) Manganese dioxide / carbon microspheres (MnO 2 / CMSs) composites

[0048] Add 6 g of glucose powder into a beaker containing 100 mL of deionized water, stir for 1 h, then place the mixed solution in an autoclave, and conduct a hydrothermal reaction at 180 °C for 24 h, and after the autoclave is cooled to room temperature, pump the product Filter, wash several times with absolute ethanol and deionized water, and vacuum dry at 60°C for 12 hours to obtain carbon microspheres (CMSs). Then 0.86g KMnO 4 and 0.15g CMSs were added to 100mL deionized water and stirred continuously. After the mixture was stirred for 5min, 1mL of concentrated sulfuric acid was added to make the pH of the reaction system 1~2. Stir at room temperature for 30min, and then the mixture was heated to 80 ℃, reflux for 1h; after the reaction system was cooled to room temperature, suction filtered, the product was washed several times with absolute ethanol and deionized water, and dried at 60°C for 12h...

Embodiment 2

[0053] 1) Manganese dioxide / carbon microspheres (MnO 2 / CMSs) composites

[0054] Add 5.5% glucose powder into a beaker filled with 100mL deionized water, stir for 1h, then place the mixed solution in an autoclave, and conduct a hydrothermal reaction at 185°C for 12h. After the autoclave is cooled to room temperature, filter the product with suction 1. Washing several times with absolute ethanol and deionized water, and drying in vacuum at 60° C. for 12 hours to obtain carbon microspheres (CMSs). Then 0.9g KMnO 4 and 0.15g CMSs were added to 100mL deionized water and stirred continuously. After the mixture was stirred for 5min, 1mL of concentrated sulfuric acid was added to make the pH of the reaction system 1~2. Stir at room temperature for 50min, and then the mixture was heated to 80 ℃, reflux for 1h; after the reaction system was cooled to room temperature, suction filtered, the product was washed several times with absolute ethanol and deionized water, and dried at 60°C ...

Embodiment 3

[0059] 1) Manganese dioxide / carbon microspheres (MnO 2 / CMSs) composites

[0060]Add 6 g of glucose powder into a beaker with 100 mL of deionized water, stir for 2 h, then place the mixed solution in an autoclave, and conduct a hydrothermal reaction at 180 ° C for 24 h. After the autoclave is cooled to room temperature, the product is extracted Filter, wash several times with absolute ethanol and deionized water, and vacuum dry at 60°C for 12 hours to obtain carbon microspheres (CMSs). Then 0.8g KMnO 4 and 0.16g CMSs were added to 100mL deionized water and stirred continuously. After the mixture was stirred for 5min, 1mL of concentrated sulfuric acid was added to make the pH of the reaction system 1~2. Stir at room temperature for 30min, and then the mixture was heated to 80 ℃, reflux for 1h; after the reaction system was cooled to room temperature, suction filtered, the product was washed several times with absolute ethanol and deionized water, and dried at 60°C for 12h to ...

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Abstract

The invention discloses a manganese dioxide / carbon microspheres (MnO2 / CMSs) composite material used as a supercapacitor electrode material, and belongs to the technical field of composite materials. The MnO2 / CMSs composite material is obtained by a preparation method including taking glucose as an initial raw material, obtaining the carbon microspheres according to a hydrothermal method and compositing the carbon microspheres with the manganese dioxide according to an in-situ self-assembly method. Electrochemical property tests show that the prepared MnO2 / CMSs composite material can achieve a synergistic effect of properties of the carbon microspheres and the manganese dioxide, has excellent properties which a single electrode does not have, and demonstrates high electrochemical capacitor behaviors, excellent rate capability and high cycling stability, thereby being capable of serving as the supercapacitor electrode material. Moreover, the composite material is simple in preparation process, stable in technology, easy to operate, reliable in quality and low in cost, and can meet basic requirements of commercialization when serving as the supercapacitor electrode material.

Description

technical field [0001] The present invention relates to the preparation of a kind of manganese dioxide / carbon microsphere composite material, relate in particular to a kind of manganese dioxide / carbon microsphere (MnO 2 / CMSs) composite material; The present invention also relates to the manganese dioxide / carbon microspheres (MnO 2 / CMSs) composite materials are used as supercapacitor electrode materials, and belong to the field of composite materials and the field of electrochemical materials. Background technique [0002] Supercapacitor is a new type of energy storage / conversion device, which is widely used in portable electronic products, hybrid electric vehicles and large industrial equipment etc. The selection of electrode materials is the main reason affecting supercapacitors, mainly including metal oxides, conductive polymers and carbon-based materials. [0003] MnO 2 Due to its abundance, cheapness, environmental friendliness, lively redox activity, and high theo...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/46H01G11/24
CPCY02E60/13H01G11/86H01G11/30H01G11/42H01G11/44H01G11/46
Inventor 杨玉英强睿斌吴红英胡中爱张子瑜董雅玉
Owner NORTHWEST NORMAL UNIVERSITY
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