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Lowcost preparation method of MnO2 / graphene composite electrode materials used for supercapacitor

A supercapacitor and graphene composite technology, applied in the manufacture of hybrid/electric double-layer capacitors, etc., can solve the problems of complex process, waste of raw materials, time-consuming and laborious, and achieve the effect of simplifying the process, mild conditions, and reducing costs.

Inactive Publication Date: 2013-04-10
LIAONING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually it is necessary to obtain graphite oxide by centrifugation, and the solution containing divalent manganese salt and strong acid is discarded. Not only is the process complicated, time-consuming and laborious, but also a waste of raw materials. At the same time, the discarded substances have caused serious pollution to the environment.

Method used

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  • Lowcost preparation method of MnO2 / graphene composite electrode materials used for supercapacitor
  • Lowcost preparation method of MnO2 / graphene composite electrode materials used for supercapacitor
  • Lowcost preparation method of MnO2 / graphene composite electrode materials used for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] process such as figure 1 The steps shown are performed:

[0019] a. Add 5g of flake graphite and 120ml of 98% concentrated sulfuric acid into a 1000ml beaker, stir for 10 minutes under ice bath, and then o Under the condition of C, add 2.97g potassium nitrate to the beaker, slowly add 15g potassium permanganate after stirring for 2 hours, stir for 2 hours under ice bath conditions, transfer the beaker to 35 o Continue to stir in the C water bath for 45 minutes, then slowly add 230ml deionized water, and then raise the temperature of the water bath to 98 o C and stir for 30 minutes, remove the beaker from the water bath and add 60 o C deionized water to a volume of 800ml, stirring to bring the temperature down to 25 o C, finally add 5ml mass fraction of 30% H 2 o 2 , stirred for 2 hours to obtain a uniformly dispersed graphite oxide stock solution, namely graphite oxide, Mn 2+ mixed liquid;

[0020] B. get the graphite oxide stoste of 10ml a step gained, measure ...

Embodiment 2

[0028] process such as figure 1 The steps shown are performed:

[0029] a. Add 5g of flake graphite and 120ml of 98% concentrated sulfuric acid into a 1000ml beaker, stir for 10 minutes under ice bath, then o Under the condition of C, add 5g of potassium nitrate to the beaker, slowly add 30g of potassium permanganate after stirring for 3 hours, stir for 3 hours under ice bath conditions, transfer the beaker to 35 o Continue to stir in the C water bath for 60 minutes, then slowly add 300ml deionized water, and raise the temperature of the water bath to 98 o C and stir for 60 minutes, remove the beaker from the water bath and add 60 o C deionized water to a volume of 800ml, stirring to reduce the temperature to 30 o C, finally add 25ml mass fraction of 30% H 2 o 2 , to obtain the graphite oxide stock solution after stirring evenly;

[0030] b. Get the graphite oxide stock solution gained in step a, measure the concentration of divalent manganese ions in the graphite oxide...

Embodiment 3

[0034] process such as figure 1 The steps shown are performed:

[0035] a. Add 5g flake graphite and 120ml 98% concentrated sulfuric acid to a 1000ml beaker, stir for 10 minutes under ice bath, o Under the condition of C, add 2g of potassium nitrate to the beaker, slowly add 22.5g of potassium permanganate after stirring for 2.5 hours, stir for 2.5 hours under ice bath conditions, transfer the beaker to 35 o Continue to stir in the C water bath for 30 minutes, then slowly add 200ml deionized water, and raise the temperature of the water bath to 98 o C and stir for 45 minutes, remove the beaker from the water bath and add 60 o C deionized water to a volume of 700ml, stirring to reduce the temperature to 20 o C, finally add 15ml mass fraction of 30% H 2 o 2 , to obtain the graphite oxide stock solution after stirring evenly;

[0036] b. Get the graphite oxide stock solution gained in step a, measure the concentration of divalent manganese ions in the graphite oxide stock ...

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Abstract

The invention discloses a lowcost preparation method of MnO2 / graphene composite electrode materials used for supercapacitor. The graphite oxide stoste containing graphite oxide and divalent manganese ion which is obtained in a graphite oxidation process is directly used as a precursor of preparation of MnO2 / graphene compound, isolation of the graphite oxide is not needed, and the craft process is simplified. The divalent manganese salt in the graphite oxide stoste is used as one of manganese resources. Then potassium permanganate is added and manganese oxide is formed. Raw materials are effectively used and cost is lowered. Glucose which is of no influence to MnO2 structure is adopted as reducing agent to restore the graphite oxide to prepare grapheme, the condition is mild, green and environmental protection are achieved, and the method is suitable for mass production. The mass fraction of MnO2 in the MnO2 / graphene composite electrode materials is 56% to 94%. Electrochemistry volume reaches 100 F / g to 400 F / g.

Description

Technical field [0001] The invention involves a super capacitor for MNO 2 / The preparation method of graphene composite electrode materials, especially a high -ratio capacitance MNO with simple craftsmanship, low cost, environmental protection, and suitable for large -scale production 2 / Green preparation method of graphene composite electrode material. Background technique [0002] MNO 2 Due to the characteristics of rich reserves, low prices, environmental friendly and excellent electrochemical properties, have become one of the electrode materials for electrochemical capacitors.However, because its electrochemical oxidation and reduction reversibility and lower conductivity have greatly limited its application, and the composite of high -conductive material composite is an effective way to give full play to its electrochemical properties. [0003] Graphene is a two -dimensional single -layer graphite composed of carbon atomic hexagonal structure (honeycomb), and is the basic u...

Claims

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Application Information

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IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 曲江英高峰李雨佳石琳邵光华
Owner LIAONING NORMAL UNIVERSITY
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