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Self-supporting graphene manganese dioxide nanowire composite film electrode and preparation method thereof

A manganese dioxide nano-composite film technology, which is applied in graphene, hybrid capacitor electrodes, manganese oxide/manganese hydroxide, etc., can solve the problems of low electrochemical performance and general mass specific capacitance, and improve electrochemical performance , Environmentally friendly theoretical capacitance, the effect of enhancing conductivity

Active Publication Date: 2021-12-21
苏州碳素集电新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problems of low electrochemical performance and general mass specific capacitance in existing supporting flexible electrode materials, the invention provides a self-supporting graphene manganese dioxide nanowire composite film electrode and its preparation method

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  • Self-supporting graphene manganese dioxide nanowire composite film electrode and preparation method thereof
  • Self-supporting graphene manganese dioxide nanowire composite film electrode and preparation method thereof
  • Self-supporting graphene manganese dioxide nanowire composite film electrode and preparation method thereof

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Embodiment 1

[0035] see figure 1 , This embodiment provides a method for preparing a self-supporting graphene-manganese dioxide nanowire composite film electrode. The preparation method combines electrochemically exfoliated graphene with manganese dioxide nanowires to obtain a composite film electrode. Since graphene has a large specific surface area, excellent electrical conductivity, good chemical properties and mechanical properties, it is a very good choice to prepare self-supporting flexible electrode materials with graphene. This embodiment is based on graphene-based flexible self-supporting supercapacitor electrodes, and makes it have higher specific capacitance. Composite transition metal oxides with pseudocapacitive charge storage capability and self-supporting graphene can be designed to obtain composite thin-film electrode materials with very good performance through rational design. Based on this, the preparation method of this embodiment is mainly carried out from the followi...

Embodiment 2

[0053] This embodiment provides a preparation method of a self-supporting graphene manganese dioxide nanowire composite film electrode, which is similar to the preparation method in Example 1, the difference is that the MnO 2 The mass ratio of the mass to the composite film is 30%. Composite thin film material tested 1mA / cm by cyclic charging and discharging 2 Under the current density, the specific capacitance is 767mF / cm 2 , which can meet the electrode conductivity requirements of supercapacitors in some special cases.

Embodiment 3

[0055] This embodiment provides a preparation method of a self-supporting graphene manganese dioxide nanowire composite film electrode, which is similar to the preparation method in Example 1, the difference is that the MnO 2 The weight accounts for 10% of the weight of the composite film. Composite materials tested 1mA / cm by cyclic charge and discharge 2 Under the current density, the specific capacitance is 476mF / cm 2 , which can meet the electrode conductivity requirements of supercapacitors in some special cases.

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Abstract

The invention discloses a self-supporting graphene manganese dioxide nanowire composite film electrode and a preparation method thereof. The preparation method includes: applying a voltage between the working electrode and the counter electrode to expand the graphite foil, applying a voltage to exfoliate the graphene to obtain graphene flakes, then washing and ultrasonic cleaning for many times, and finally drying to obtain electrochemical exfoliation Graphene: first dissolve potassium permanganate and potassium persulfate to obtain a mixed solution, then perform a hydrothermal reaction, and finally wash and dry the product to obtain manganese dioxide nanowires; first disperse electrochemically exfoliated graphene in a solvent to obtain graphite graphene solution, and then disperse the manganese dioxide nanowires in the graphene solution to obtain a mixed solution, then remove the solvent by suction filtration to obtain a composite film, and finally dry the composite film to obtain a composite film. The invention has simple process and high yield, and the composite film electrode has high mass specific capacitance, good area specific capacitance and excellent cycle stability, and has great application prospect.

Description

technical field [0001] The present invention relates to a preparation method of a thin film electrode in the technical field of electrode material preparation, in particular to a preparation method of a self-supporting graphene manganese dioxide nanowire composite thin film electrode, and also to a self-supporting graphene dioxide prepared by the preparation method. Manganese nanowire composite thin film electrodes. Background technique [0002] Flexible supercapacitors are promising electrochemical energy storage devices. Among them, flexible electrode materials with excellent performance are the key to the preparation of flexible supercapacitors. Flexible electrode materials are mainly divided into substrate-supported flexible electrode materials and self-supporting flexible electrode materials. Substrate-supported flexible electrode materials are coating or growing active materials on flexible, porous, and lightweight substrates to enhance the mechanical strength of ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19C01G45/02H01G11/36H01G11/46H01G11/86B82Y30/00B82Y40/00
CPCC01B32/19C01G45/02H01G11/36H01G11/46H01G11/86B82Y30/00B82Y40/00C01P2004/16C01P2004/20C01P2004/64C01P2004/62C01P2004/61C01P2004/03C01P2002/72C01P2002/82C01P2006/40
Inventor 李年夏松敏陈杰鞠宝钢
Owner 苏州碳素集电新材料有限公司
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