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Method for preparing MnO2/carbon composite material for super-capacitor

A technology of carbon composite materials and supercapacitors, applied in the manufacture of hybrid/electric double layer capacitors, electrodes of hybrid capacitors, etc., can solve the problems of limited precious metal resources, high prices, restricted use, etc., and achieve a high specific capacity that is conducive to popularization and application , the effect of increasing the power density

Active Publication Date: 2013-11-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited resources and high price of precious metals, its use is limited.

Method used

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  • Method for preparing MnO2/carbon composite material for super-capacitor
  • Method for preparing MnO2/carbon composite material for super-capacitor
  • Method for preparing MnO2/carbon composite material for super-capacitor

Examples

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Embodiment 1

[0018] This embodiment includes the following steps:

[0019] Step 1. Dissolve 60g of sucrose in 900mL of deionized water, stir until the solution is clear, transfer to a 1000mL hydrothermal reaction kettle, heat at 150°C and 900r / min for 6h, and the resulting precursor solution is centrifuged, washed with alcohol, After washing each 3 times, dry in a vacuum oven at 60°C for 12 hours to prepare monodisperse carbon spheres;

[0020] Step 2: Take 1g of monodisperse carbon spheres and heat them in 500mL of 0.5M NaOH solution. The heating temperature is 50°C and the heating time is 12h. Dry in a vacuum oven for 12 hours, and then calcinate the obtained solid in an argon atmosphere furnace, the calcining temperature is 1000°C, and the calcining time is 0.5h;

[0021] Step 3: Use the modified carbon spheres in step 2 as a template, place in 200mL, 5g / L KMnO 4 In the aqueous solution, stirred and aged at room temperature for 5 hours, a precipitate was obtained, and the precipitate ...

Embodiment 2

[0024] This embodiment includes the following steps:

[0025] Step 1. Dissolve 80g of fructose in 900mL of deionized water, stir until the solution is clear, transfer to a 1000mL hydrothermal reaction kettle, heat at 170°C and 900r / min for 3 hours, and then centrifuge, wash with water, and alcohol After washing each 3 times, dry in a vacuum oven at 60°C for 12 hours to prepare monodisperse carbon spheres;

[0026] Step 2: Take 1.5g of monodisperse carbon spheres and heat them in 200mL of 2M NaOH solution. The heating temperature is 70°C and the heating time is 8h. Dry in an oven for 15 hours, and then calcine the obtained solid in a vacuum furnace at a calcination temperature of 700°C and a calcination time of 2 hours;

[0027] Step 3. Use the modified carbon spheres in step 2 as a template, place in 500mL, 10g / L KMnO 4 In the aqueous solution, stirred and aged at room temperature for 4 hours, a precipitate was obtained, and the precipitate was centrifuged, washed with water...

Embodiment 3

[0030] This embodiment includes the following steps:

[0031] Step 1. Dissolve 100g of glucose in 900mL of deionized water, stir to a clear solution, transfer to a 1000mL hydrothermal reaction kettle, heat at 200°C and 900r / min for 3 hours; the resulting precursor solution is centrifuged, washed with water, and washed with alcohol After 3 times each, dry in a vacuum oven at 60°C for 12 hours to prepare C balls.

[0032] Step 2: Take 3g of dried C balls, heat and stir in 750mL, 5M NaOH solution at 80°C for 6h, then centrifuge the mixture solution, wash with water, wash with alcohol three times, and dry in a vacuum oven at 80°C for 12h. The obtained solid was then calcined in an argon atmosphere at a calcining temperature of 800° C. and a calcining time of 2 h.

[0033] Step 3. Use the carbon spheres modified in step 2 as a template, and place them in 800mL, 15g / L KMnO 4 In an aqueous solution, stir and age at room temperature for 1 h to obtain a precipitate, centrifuge the pr...

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Abstract

The invention provides a method for preparing a MnO2 / carbon composite material for a super-capacitor. The method includes the steps of step one, dissolving glucose or sucrose or fructose in deionized water, stirring until a settled solution is obtained, transferring the settled solution into a hydrothermal reaction kettle, performing centrifugation, water washing, alcohol washing and drying on an obtained polymeric pecursor solution to prepare monodisperse carbon spheres; step two, taking the monodisperse carbon spheres, performing heat treatment on the monodisperse carbon spheres in a NaOH solution, then performing centrifugation, water washing and alcohol washing on a mixture solution three times, conducting drying, and performing calcination treatment in vacuum or inert atmosphere; step three, using the carbon spheres experiencing modified treatment in the step two as a template, placing the template in a KMnO4 aqueous solution, stirring and aging at the room temperature, obtaining a sediment, performing centrifugation, water washing and alcohol washing on the sediment, performing drying in a vacuum oven, and obtaining CS@MnO2 coated powder. Obtained MnO2 / carbon sphere composite powder is of a core-shell structure, the specific surface area of the powder can reach more than 778m<2> / g, the specific capacity of the powder can reach more than 439F / g, charge transfer resistance is lower than 2.1 omega, and the powder is a novel super-capacitor electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation of new energy materials, in particular to a MnO used for supercapacitors 2 / Preparation method of carbon composite material. Background technique [0002] As a new type of energy storage device, supercapacitor has the characteristics of long cycle life, fast charge and discharge speed, high power and environmental friendliness, so it has attracted extensive attention of scientists at home and abroad. The types of supercapacitors can be divided into electric double layer capacitors and Faraday pseudocapacitors according to their working principles. Electric double layer capacitors are based on the electric double layer theory and use the interfacial electric double layer capacitance formed between electrodes and electrolytes to store energy. The Faraday quasi-capacitor is based on the Faraday process, that is, it is generated during the electrochemical change of Faraday charge transfer, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/38H01G11/86
CPCY02E60/13
Inventor 汪长安李洒李承书
Owner TSINGHUA UNIV
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