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Nanowire-like MnO2 material for supercapacitor and preparation method and application thereof

A technology of supercapacitors and nanowires, applied in the manufacture of hybrid/electric double layer capacitors, electrodes of hybrid capacitors, etc., can solve the problems of inability to meet the requirements of supercapacitors on electrode materials, poor cyclability of manganese dioxide, performance degradation, etc. The effect of good ion transport performance and storage performance, simple preparation process and large specific surface area

Active Publication Date: 2018-07-27
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the reports in the literature and patents, the existing manganese dioxide with various shapes such as nano flakes and rough spherical surfaces has poor cycle performance. As the number of charge and discharge cycles increases, the performance will be compromised. Obviously, it cannot meet the requirements of supercapacitors for electrode materials

Method used

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  • Nanowire-like MnO2 material for supercapacitor and preparation method and application thereof
  • Nanowire-like MnO2 material for supercapacitor and preparation method and application thereof
  • Nanowire-like MnO2 material for supercapacitor and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment

[0023] First, the muffle furnace was raised from room temperature to 350 °C, and then 5 g NaNO 3 Put it into the muffle furnace and keep it warm for 10min, so that the NaNO 3 melted, then 0.1gMnCl 2 Mix with 0.04g graphite nanofiber GNFs and ball mill evenly, then add molten NaNO 3 , stir evenly to make the reaction complete, keep warm for 1-2min, cool to room temperature naturally, wash, centrifuge, and dry to obtain nanowire-like MnO 2 Material.

[0024] The aforementioned nanowire-like MnO 2 The XRD spectrum of the material is as figure 1 Shown, wherein, (211), (222), (321), (400), (431), (611) is Mn 2 o 3 The characteristic peaks correspond to the standard card JCPDS No. 10-0069, where * is MnO 2 The (111) characteristic peak. As can be seen from the XRD pattern, MnO 2 The characteristic peaks are sharp sharp peaks, indicating that MnO 2 The degree of crystallization is better and the material purity is higher.

[0025] The aforementioned nanowire-like MnO 2 Th...

Embodiment 2

[0029] First, the muffle furnace was raised from room temperature to 300 °C, and then 5 g NaNO 3 Put it into the muffle furnace and keep it warm for 10min, so that the NaNO 3 melted, then 0.1gMnCl 2 Mix with 0.004g graphite nanofiber GNFs and ball mill evenly, then add molten NaNO 3 , keep warm for 1-2min, cool naturally to room temperature, wash, centrifuge, and dry to obtain nanowire-like MnO 2 material, in the form of nanowires.

[0030] The nanowire-like MnO 2 The material has electrical properties equivalent to that of Example 1 and is suitable for supercapacitors.

[0031] In summary, the MnO provided by the invention 2 The material is nanowire-like in shape, has a large specific surface area and a regular microstructure, which is conducive to the adsorption and transport of electrons, so it has better electrochemical activity and can be applied to supercapacitors.

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Abstract

The invention discloses a nanowire-like MnO2 material for a supercapacitor and a preparation method and the application thereof. The preparation method comprises the following steps: 1, heating for melting NaNO3; 2, performing ball milling for mixing MnCl2 and GNFs uniformly; 3, adding the uniformly mixed MnCl2 and GNFs into molten NaNO3, stirring uniformly, and preserving heat for complete reaction; 4, cooling to a room temperature, washing, centrifuging and drying to obtain nanowire-like MnO2 nanoparticles. By the preparation method provided by the invention, raw materials are cheap and easyto obtain, the preparation process is simple, the production cost is low, and the prepared MnO2 material has controllable microscopic particle morphology and uniform nanowire distribution, has relatively high specific surface area and ion transport performance and is applicable to a supercapacitor material.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular, relates to a nanowire-shaped MnO for supercapacitors. 2 Preparation method of molten salt. Background technique [0002] Supercapacitor is a new type of energy storage element between batteries and electrostatic capacitors. It has the characteristics of wide operating temperature range and long cycle life, and can meet the needs of high power output of electric vehicles. The preparation of high energy density aqueous phase asymmetric capacitors can not only increase the energy density of capacitors, but also be beneficial to environmental protection, which has become a research hotspot in recent years. [0003] The research on supercapacitors mainly focuses on electrode materials, among which manganese dioxide, as a common manganese oxide, has attracted great attention because of its environmental friendliness, low price and excellent performance, and the incorpor...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/86H01G11/36
CPCH01G11/36H01G11/46H01G11/86Y02E60/13
Inventor 李冬冬类延华周佳贝陶富军张玉良邱智超
Owner SHANGHAI MARITIME UNIVERSITY
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