Electrode material of C@MnO2 nanotube super capacitor and preparation method and application of electrode material

Abstract

The invention provides an electrode material of a three-dimensional C@MnO2 composite nanotube array super capacitor and a preparation method and application of the electrode material. A nanotube-shaped carbon layer is arranged inside the material, and a MnO2 material is arranged outside the material. The preparation method includes the steps that (1) a flexible carbon fiber cloth is subjected to pretreatment and magnetron sputtering to deposit a zinc oxide thin film; (2) zinc oxide nanorod array growth is conducted; (3) a zinc oxide nanorod array carbon cloth with the surface being coated with thin-layer carbon is prepared; (4) the carbon cloth obtained in the step (3) is used as a working electrode, and a three-electrode electrodeposition system is used for conducting manganese dioxide electrochemical deposition, flushing and drying to obtain the super capacitor electrode material which is of a three-dimensional C@MnO2 nanotube-shaped array structure. According to the material, the carbon material with good electrical conductivity and the MnO2 material with high specific capacitance and poor electrical conductivity are compounded, the advantages of the carbon material and the advantages of the MnO2 material are fully performed, due to hollow nanotubes, electrolyte solution ions can better enter and exit, and thus the rate capability of the capacitor can be greatly improved.

Description

technical field [0001] The invention belongs to the field of energy storage and devices, in particular to a three-dimensional CMnO 2 Composite nanotube array supercapacitor electrode material and its preparation method and application. Background technique [0002] Flexible and wearable electronic products are attracting more and more attention and interest, but at the same time, higher requirements are put forward for their power supply components, such as light weight, flexibility, high power, long life, and high energy density. The commonly used devices for providing energy storage are mainly lithium batteries and supercapacitors. Compared with lithium-ion batteries, although the energy density of supercapacitors is lower, supercapacitors can provide higher power density and cycle life, and can play a special role And performance, especially for electronic devices that require fast charging and discharging, its advantages are unmatched by lithium-ion batteries. [0003]...

AI Technical Summary

Problems solved by technology

In patent CN102354612A, Feng Wei et al. used liquid phase solution as carbon source and catalyst source, and grew carbon tubes with very high surface density and aspect ratio on carbon cloth fibers by CVD. coated with MnO 2 Particles, this kind of carbon tubes are easy to fall due to the high aspect ratio, which is not conducive to the electrolyte entering into the carbon tube array and the intercalation and extraction of ions, resulting in poor high-rate charge-discharge performance and cycle performance

[0005] The above-mentioned CVD methods for growing carbon tubes are all carried out at high temperature, which requires high equipment, complicated process, high cost, and is not conducive to the integration of energy devices and other devices.

[0006] ZnO nanorod arrays have a three-dimensional structure and are used as templates for the preparation of electrodes for 3D supercapacitors, which have shown potential advantages (Yong Zhao, Peng Jiang. MnO2 nanosheets grown on the ZnO-nanorod-modified carbon fiber paper for supercapacitor electrode materials, Colloids and SurfacesA : Physicochem. Eng. Aspects, 2014, 444, 232-239; Yong Zhao, Peng Jiang, Sishen Xie. Template-mediated synthesis of three-dimensional coral-like MnO2 nanostructure for supercapacitors, Journal of Power Sources, 2013, 239, 393- 398.), but ZnO nanorods contribute almost zero to the capacitance of supercapacitors, and increase the quality of capacitor electrodes, which is not conducive to the lightweight development of supercapacitors

[0007] Existing carbon nanotube (CNT) MnO 2 The growth process of composite supercapacitor electrode materials is complicated, the equipment requirements are high, and the cost is high, making it difficult to promote and apply on a large scale

ZnOAuMnO 2 Although composite supercapacitor electrode materials have excellent performance, ZnO nanoarrays that do not contribute to capacitor capacity increase the electrode quality, and use noble metals to improve conductivity, which cannot meet the development trend of supercapacitors with light weight and low cost.

[0008] In summary, there are carbon cloths with low specific capacitance per unit area in the prior art; ZnO nanorods do not contribute to the capacitance of supercapacitors and increase the quality of capacitor electrodes; coated MnO 2 The carbon nanotube aspect ratio of the particle is too high and it is easy to lodging, which is not conducive to the electrolyte entering into the carbon tube array and the intercalation and extraction of ions, resulting in poor high-rate charge-discharge performance and cycle performance; the existing carbon nanotube composite super The growth process of capacitor electrode materials is complicated, the equipment requirements are high, the cost is high, and it is difficult to promote and apply on a large scale.

Images