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Oxidized carbon nanotube array/graphene/manganese dioxide composite electrode

A carbon nanotube array and graphene composite technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of reducing the high current discharge characteristics of electrodes, occupying active material content, and complicating the preparation process, etc. Achieve the effect of improving reversible conversion efficiency, convenient operation, good electrochemical activity and hydrophilicity

Active Publication Date: 2018-07-17
南京绿索电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In addition, in the traditional composite material electrode preparation process, since it is difficult to realize a self-supporting three-dimensional network conductive framework between the active material composite material and the conductive substrate, conductive agents and binders are required; however, the use of conductive agents And the binder not only complicates the preparation process, but also the conductive agent and the binder will occupy the content of the active material, thereby reducing the specific capacity; in addition, the binders used are all non-conductive organic polymers, and the bonding agent Additives will increase the internal resistance of the electrode and reduce the high-current discharge characteristics of the electrode, which will also affect the cycle performance

Method used

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  • Oxidized carbon nanotube array/graphene/manganese dioxide composite electrode

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Embodiment 1

[0033] (1) Carbon nanotube arrays are prepared on conductive substrates by physical or chemical vapor deposition.

[0034] Based on nickel foil, Fe(NO 3 ) 3 As a catalyst, it is pre-coated on the surface of nickel foil, using methane as a carbon source and nitrogen as a protective gas, and using chemical vapor deposition (CVD) to prepare carbon nanotube arrays.

[0035] (2) Preparation of carbon nanotube array / graphene / manganese dioxide composite electrode.

[0036]By manganese dioxide: the ratio of graphene oxide mass ratio is 7:1 will be uniformly dispersed in graphene oxide (0.3g / ml) solution, by carbon nanotube array: the ratio of graphene oxide mass ratio will be 2:1 The carbon nanotube array was immersed in the graphene oxide solution, decompressed and vacuumed, and ultrasonically oscillated; the graphene oxide solution was heated to 90°C, and the reducing agent hydrazine hydrate was added according to the ratio of 1ml hydrazine hydrate / 100g graphene oxide, and stirred...

Embodiment 2

[0040] In step (2), manganese dioxide: graphene oxide mass ratio=6:1, carbon nanotube array: graphene oxide mass ratio=3:1, others are the same as embodiment 1.

Embodiment 3

[0042] In step (2), manganese dioxide: graphene oxide mass ratio=5:1, carbon nanotube array: graphene oxide mass ratio=4:1, others are the same as embodiment 1.

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Abstract

The invention discloses a surface layer oxidized carbon nanotube array / graphene / manganese dioxide composite material electrode and a preparation method and application thereof. The composite material electrode comprises a conductive substrate, a carbon nanotube array, graphene and manganese dioxide, wherein the carbon nanotube array and the conductive substrate are perpendicularly connected to form a three-dimensional conductive network skeleton; the graphene coats the carbon nanotube array in a nano-scale so as to form a carbon nanotube array-graphene composite structure; the manganese dioxide is dispersed in the carbon nanotube array-graphene composite structure in the nano-scale to form the carbon nanotube array / graphene / manganese dioxide composite material electrode; and the surface layer of the composite material electrode is oxidized graphene. The composite material electrode disclosed by the invention is good in conductivity, stable in structure, and capable of automatically supporting, and excellent in cycle performance and capacitance performance. The method for preparing the composite material electrode is easy to operate, environment-friendly, and low in energy consumption. A super capacitor using the composite material electrode is high in capacitance and good in cycle performance.

Description

technical field [0001] The present invention relates to a composite electrode for supercapacitors, in particular to a surface oxidized carbon nanotube array / graphene / manganese dioxide composite electrode, a preparation method of the composite electrode and the use of the composite electrode in a supercapacitor The application belongs to the field of new energy products. Background technique [0002] Supercapacitor is a new type of power electronic component. Its performance is between traditional capacitors and batteries. It has the advantages of high power density, long cycle life, wide operating temperature range, and no pollution. , aviation and defense fields have broad application prospects. According to the principle of energy storage, supercapacitors can be divided into electric double layer capacitors and faraday capacitors. The current research focus is on their electrode materials, including carbon materials, metal oxides and conductive polymers. [0003] In rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/46H01G11/32H01G11/86
CPCY02E60/13
Inventor 熊廷玉张金春邹雪峰赵楠陆卫荣
Owner 南京绿索电子科技有限公司