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Manganese oxide/graphene porous microspheres, preparation method and energy storage application thereof

A technology of porous microspheres and graphene, which is applied in the manufacture of hybrid/electrical double layer capacitors, electrical components, battery electrodes, etc., can solve the problems of difficult mass production, long synthesis cycle, complicated steps, etc. , the effect of increased porosity and simple process

Inactive Publication Date: 2014-07-30
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods generally have the disadvantages of cumbersome steps, long synthesis cycle, low efficiency and difficulty in large-scale production, and the use of a large amount of organic solvents is easy to cause pollution to the environment

Method used

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  • Manganese oxide/graphene porous microspheres, preparation method and energy storage application thereof
  • Manganese oxide/graphene porous microspheres, preparation method and energy storage application thereof
  • Manganese oxide/graphene porous microspheres, preparation method and energy storage application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Preparation of manganese dioxide / graphene porous microspheres using graphene oxide as a precursor

[0023] 0.12 g of graphite oxide was ultrasonically dispersed in distilled water for 30 minutes. After high-speed centrifugation for 10 minutes, the supernatant was taken to prepare a graphene oxide aqueous solution with a concentration of 0.56 mg / ml, and a small amount of ammonia water was added dropwise to adjust the pH value to neutral. Slowly add an appropriate amount of nano-manganese dioxide particle suspension into the graphene oxide solution (the mass ratio of graphene oxide / manganese dioxide is 1:4) under stirring, then raise the temperature to 50° C. and continue stirring for 1 h. The resulting mixed solution was spray dried with an inlet temperature of 125°C and an outlet temperature of 40°C. The collected solid powders were sequentially dried at 80° C. and 250° C. for 2 hours respectively to obtain a trimanganese dioxide / graphene composite material....

Embodiment 2

[0024] Example 2: Preparation of manganese dioxide / graphene porous microspheres using reduced graphene as a precursor

[0025] 0.25 g of graphite oxide was ultrasonically dispersed in distilled water for 30 minutes, centrifuged at high speed for 10 minutes, and the supernatant was taken to prepare a graphene oxide solution with a concentration of 0.05 wt.%. Add 2.5 ml of 80% hydrazine hydrate and 21 ml of 25% ammonia solution in sequence. After magnetic stirring for 12 h, the solution was dialyzed several times in 0.5% ammonia solution to remove hydrazine hydrate, resulting in a stable reduced graphene suspension. Add an appropriate amount of nano-manganese dioxide particle suspension into the graphene solution (the mass ratio of reduced graphene / manganese dioxide is 1:9), stir magnetically for 30 minutes, and disperse ultrasonically for 30 minutes. The obtained mixed solution was spray-dried under the same conditions. Continue drying the collected solid at 80° C. for 2 hour...

Embodiment 3

[0026] Example 3: Using reduced graphene as a precursor to prepare trimanganese tetraoxide / graphene composite porous microspheres

[0027] 0.25 g of graphite oxide was ultrasonically dispersed in distilled water for 30 minutes, centrifuged at high speed for 10 minutes, and the supernatant was taken to prepare a graphene oxide solution with a concentration of 0.05 wt.%. Add 2.5 ml of 80% hydrazine hydrate and 21 ml of 25% ammonia solution in sequence. After magnetic stirring for 12 h, the solution was dialyzed several times in 0.5% ammonia solution to remove hydrazine hydrate, resulting in a stable reduced graphene suspension. Add an appropriate amount of nanometer manganese tetraoxide particle suspension into the graphene solution (reduced graphene / manganese tetraoxide mass ratio is 1:9), magnetically stir for 30 minutes, and then ultrasonically disperse for 30 minutes. The obtained mixed solution was spray-dried under the same conditions. Continue drying the collected solid...

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Abstract

The invention discloses a manganese oxide / graphene porous microspheres, a preparation method and energy storage application of the manganese oxide / graphene porous microspheres. The preparation method includes the concrete steps that nano manganese oxide particles or precursor is mixed with aqueous suspension of graphene according to the mass ratio of manganese oxide / graphene 1:10-20:1; after the mixed solution is dispersed evenly through ultrasound or stirring, spray drying is conducted on the mixed solution through a spray drier, temperature at an inlet ranges from 100 DEG C to 280 DEG C, and temperature at an outlet is controlled between 30 DEG C 120 DEG C; after the collected solid powder is heated under 80 DEG C to 350 DEG C, manganese oxide / graphene secondary microsphere structure composite material is obtained. The manganese oxide / graphene composite material prepared through the method has excellent energy storage performance.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a manganese oxide / graphene porous microsphere and its preparation method and energy storage application. Background technique [0002] As a new type of chemical energy storage device, supercapacitors have the advantages of high specific power, long cycle life, safety and environmental friendliness, and are widely used in transportation, mobile communications, information technology, aerospace and national defense technology and other fields. The performance of supercapacitors is closely related to the performance of electrode materials. Therefore, the research on high-performance electrode materials has become a current research hotspot. There have been many reports on carbon materials, metal oxides, and polymer materials. [0003] Among the metal oxide electrode materials, manganese oxide (including manganese dioxide and trimanganese tetraoxide) has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/24H01G11/86H01M4/36
CPCY02E60/10Y02E60/13
Inventor 解勤兴商莹莹于泽解超
Owner TIANJIN POLYTECHNIC UNIV
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