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Nano sheet MnO2-graphene composite material, preparation method thereof and super capacitor

A technology of nano flakes and composite materials, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology, etc., can solve the problems of low specific capacitance and poor performance of supercapacitors, achieve high specific capacitance, improve Effects of electron transfer rate, good charge-discharge performance, and cycle performance

Active Publication Date: 2014-03-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficulty of uniform distribution of graphene and manganese dioxide, the performance of supercapacitors is poor and the specific capacitance is low

Method used

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  • Nano sheet MnO2-graphene composite material, preparation method thereof and super capacitor
  • Nano sheet MnO2-graphene composite material, preparation method thereof and super capacitor
  • Nano sheet MnO2-graphene composite material, preparation method thereof and super capacitor

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preparation example Construction

[0027] The embodiment of the present invention discloses a nano-flaky MnO 2 -The preparation method of graphene composite material, comprises the following steps:

[0028] (A) Redox reaction of manganese nitrate solution in a mixed solution of hydrogen peroxide and alkali, washing and drying, to obtain powder;

[0029] The powder is dispersed in an ammonium persulfate solution, and then dispersed in an organic solvent to obtain nanosheet MnO 2 solution;

[0030] (B) The nanosheet MnO 2 After the solution is diluted, it is mixed with the dispersion of graphene powder, and after ultrasonic treatment, the nanosheet MnO 2 - Graphene composites.

[0031] In the present invention, firstly, the manganese nitrate solution is stirred in the mixed solution of hydrogen peroxide and alkali, then subjected to hydrothermal reaction, washed and dried to obtain powder. The base is preferably an alkali metal hydroxide, more preferably potassium hydroxide. The function of the alkali is to...

Embodiment 1

[0042] (1) Prepare a mixed solution of 0.6mol / L potassium hydroxide and 2mol / L hydrogen peroxide, quickly add it to 0.3mol / L manganese nitrate solution, stir for 25min, transfer to a 100ml hydrothermal reaction kettle at 150°C Reaction 16h. After suction filtration and drying, 2 g was dispersed in 0.5 mol / L ammonium persulfate solution, and stirred at 60°C for 3 h. After fully washing with ultrapure water, place it in an oven at 80°C for drying treatment, then take 2 g of the dried product and add it to 0.3 mol / L tetramethylammonium hydroxide solution, stir for 7 days, centrifuge at 8000 rpm for 1 hour, and the supernatant is ready Contains nano-flaky manganese dioxide.

[0043] (2) The expandable graphite with an average diameter of 300 μm is injected with a mixed protective gas (5% H 2 and 95% Ar), heated to 800°C for 150s, and formed expanded graphite after thermal exfoliation. Take 25mg of expanded graphite and add it to 250ml of cetyltrimethylammonium bromide solution ...

Embodiment 2

[0048] 1) Prepare a mixed solution of 0.6mol / L potassium hydroxide and 2mol / L hydrogen peroxide, quickly add it to 0.3mol / L manganese nitrate solution, stir for 25min, transfer to a 100ml hydrothermal reaction kettle and react at 150°C 16h. After suction filtration and drying, 2 g was dispersed in 0.5 mol / L ammonium persulfate solution, and stirred at 60°C for 6 h. After fully washing with ultrapure water, place it in an oven at 80°C for drying treatment, then take 2g of the dried product and add it to 0.15mol / L tetraethylammonium hydroxide solution, stir for 7 days, centrifuge at 8000rpm for 1h, and the supernatant is ready Contains nano-flaky manganese dioxide.

[0049] (2) The expandable graphite with an average diameter of 300 μm is injected with a mixed protective gas (5% H 2 and 95% Ar), heated to 1000°C for 80s, and formed expanded graphite after thermal exfoliation. Take 25mg of expanded graphite and add it to 250ml of sodium dodecylbenzenesulfonate solution with a ...

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Abstract

The invention provides a preparation method of a nano sheet MnO2-graphene composite material, which comprises the following steps: adding a manganese nitrate solution in a mixed solution of hydrogen peroxide and alkaline to perform redox reaction, washing and drying to obtain powder, dispersing the powder in an ammonium persulphate solution to treat, and then dispersing in an organic solvent to obtain a nano sheet MnO2 solution; and diluting the nano sheet MnO2 solution, mixing with a dispersion liquid of graphene powder to obtain the nano sheet MnO2-graphene composite material after ultrasonic treatment. According to the nano sheet MnO2-graphene composite material prepared by the method, the nano sheet MnO2 and the graphene are alternatively arranged and uniformly distributed to guarantee the high conductivity of the graphene, and high specific energy can be obtained. The composite material is used as a super capacitor of the positive electrode to realize high specific capacitance, good charging / discharging capacity and circulating performance, and good combination property.

Description

technical field [0001] The invention relates to the field of supercapacitors, in particular to nanosheet MnO 2 -Graphene composite material, its preparation method and supercapacitor. Background technique [0002] A supercapacitor is an energy storage device between ordinary capacitors and chemical batteries, which has the advantages of both, such as: high power density, high energy density, long cycle life, fast charge and discharge, wide operating temperature range, And it has the characteristics of instantaneous large current discharge and no pollution to the environment. As a new type of energy storage device with green environmental protection and excellent performance, supercapacitors are widely used in many fields such as national defense, electric vehicles, computers, and mobile communications. [0003] Electrode material is one of the core factors affecting the performance of supercapacitors, and is a hotspot of current research. From the material point of view, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01B31/04H01G11/86H01G11/30H01G11/36H01G11/46B82Y30/00B82Y40/00C01B32/194
CPCY02E60/13
Inventor 刘元状夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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