Preparation method of carbon-manganese dioxide composite material

A technology of manganese dioxide and composite materials, which is applied in the field of materials, can solve the problems of unsatisfactory rate performance and cycle stability of composite materials, and many surface defects of carbon materials, and achieve reaction conditions, low cost and high efficiency, excellent electrical conductivity, and products shape-controllable effect

Active Publication Date: 2018-06-29
ZHEJIANG SHANYU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon materials obtained by the redox method have many surface defects, and the rate performance and cycle stability of the obtained composite materials are not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Slowly add 90 milliliters of sulfuric acid to 30 milliliters of nitric acid in an ice-water bath, then add 3 grams of potassium permanganate to the mixed acid solution, mix well, and then add 3 grams of flake graphite (particle diameter 150 microns) to the reaction solution , with a carbon content higher than 95%), and stirred at room temperature for 24 hours. Subsequently, the reaction solution was suction-filtered with a sand core funnel, and the obtained solid was graphite intercalation compound. The obtained graphite intercalation compound was added to a mixed solution of 135 milliliters of hydrogen peroxide and 540 milliliters of sulfuric acid, stirred at room temperature for 15 minutes, then allowed to stand for expansion for 3 hours, and obtained graphene-like expanded graphite after washing.

[0025] (2) Add 1 g of the graphene-like expanded graphite obtained in (1) to 200 ml of 2% potassium permanganate aqueous solution by mass, and let it stand for reactio...

Embodiment 2

[0028] (1) Add 3 grams of potassium ferrate to 90 ml of sulfuric acid. After completely dissolving, add 3 grams of flake graphite (particle diameter 150 microns, carbon content higher than 95%) to the reaction solution, and stir at room temperature for 1 After one hour, the reaction solution was suction-filtered with a sand core funnel, and the obtained solid was graphite intercalation compound. The obtained graphite intercalation compound was added into a mixed solution of 135 milliliters of hydrogen peroxide and 540 milliliters of sulfuric acid, stirred at room temperature for 15 minutes, then allowed to stand for expansion for 3 hours, and obtained graphene-like expanded graphite after washing.

[0029] (2) Add 1 gram of the graphene-like expanded graphite obtained in (1) into 200 ml of 4% potassium permanganate aqueous solution by mass, and let it stand for reaction at 30°C for 12 hours. During the reaction, the solution was shaken manually every 2 hours to mix the solutio...

Embodiment 3

[0032] (1) Slowly add 3 grams of potassium permanganate into 90 ml of sulfuric acid. After completely dissolving, add 3 grams of flake graphite (particle diameter 150 microns, carbon content higher than 95%) to the reaction solution, and under room temperature After stirring for 1 hour, the reaction solution was suction-filtered with a sand core funnel, and the obtained solid was graphite intercalation compound. The obtained graphite intercalation compound was added into a mixed solution of 135 milliliters of hydrogen peroxide and 540 milliliters of sulfuric acid, stirred at room temperature for 15 minutes, then allowed to stand for expansion for 3 hours, and obtained graphene-like expanded graphite after washing.

[0033] (2) Add 1 gram of the graphene-like expanded graphite obtained in (1) into 200 ml of 2% by mass aqueous potassium permanganate solution, and let it stand for reaction at 30°C for 12 hours. During the reaction, the solution was shaken manually every 2 hours t...

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Abstract

The invention provides a preparation method of a carbon-manganese dioxide composite material. The preparation method is characterized by comprising the following specific steps: carrying out intercalation-expansion treatment on a raw material graphite to obtain graphene-like expanded graphite, wherein an intercalation agent is prepared from acid and an oxidant, the acid is one or more of sulfuricacid, phosphoric acid and nitric acid and the oxidant is one or more of potassium permanganate, potassium ferrate and potassium dichromate; an expansion agent is prepared from acid and an oxidant, theacid is one or two of the sulfuric acid and the phosphoric and the oxidant is one or more of hydrogen peroxide, ammonium persulfate, potassium persulfate and sodium persulfate; enabling the graphene-like expanded graphite and potassium permanganate to react under a shaking or standing condition; carrying out water washing to obtain the carbon-manganese dioxide composite material. In the compositematerial, a conjugated structure of a carbon material keeps relatively good and manganese dioxide vertically grows on the surface of a carbon nano-sheet. The carbon-manganese dioxide composite material prepared by the preparation method can be widely applied to fields including supercapacitors, lithium-ion batteries, fuel cells, energy conversion and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a carbon-manganese dioxide composite material, and the carbon-manganese dioxide composite material has a high specific surface area. Specifically, the graphene-like expanded graphite is obtained through the intercalation-expansion method; the obtained graphene-like expanded graphite is reacted under shaking or static conditions to obtain a carbon-manganese dioxide composite material with a high specific surface area. Manganese dioxide grows vertically and uniformly on the carbon nanosheets. In addition, the conjugated structure of the carbon nanosheets remains intact after the reaction, thus eliminating the need for reduction treatment. Background technique [0002] With the increasing environmental problems and the increasing consumption of fossil fuels, it is crucial to develop efficient energy storage and conversion devices. Supercapac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01B32/15B82Y30/00
CPCB82Y30/00C01G45/02
Inventor 卢红斌张佳佳陈宇菲潘运梅
Owner ZHEJIANG SHANYU TECH CO LTD
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