A kind of preparation method of nickel cobaltate/carbon nanotube composite material

Abstract

The invention discloses a method of preparing nickel cobaltite / carbon nanotube composite materials. The invention further relates to a method of preparing a carbon nanotube loaded with nano-particles nickel cobaltite. The method comprises the following steps of dissolving Ni(NO3)2.6H2O and Co(NO3)2.6H2O in diglycol to prepare a mixed metal solution A containing Ni2+ / Co2+ with a mol ratio being 1:2; dissolving NaOH and a carbon nanotube in the diglycol and performing ultrasonic dispersion to form a solution B; making the solution B added in the solution A drop by drop to acquire a mixed solution; fully and uniformly stirring the mixed solution in a condition with a temperature of 80 DEG C, moving the solution to a reaction vessel and further replacing CO2, and after the replacement, adjusting the pressure intensity of the CO2 to be 10MPa; putting the reaction vessel in an oil bath pan, setting the stirring rate to be 400r / min, the temperature to be 140-220 DEG C, and the reaction time to be 4-10h; cleaning the acquired product by ethanol and distilled water to be neutral and further performing centrifugation and 80 DEC C drying to acquire nickel cobaltite / carbon nanotube composite materials. The method which hardly damages the structure of the carbon nanotube has the characteristics of simple operation and environment friendliness. By means of the method, products can be directly acquired in the solution without calcining. The acquired nickel cobaltite / carbon nanotube composite materials have relatively high specific capacitance and good electrochemistry performance stability when applied to super capacitor electrodes.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a preparation method of carbon nanotube-supported nanometer nickel cobaltate. Background technique [0002] In recent years, supercapacitors have been widely used in communications, aerospace, large-scale industrial equipment, microelectronic devices and many other occasions that require instantaneous release of super-current due to their high power density, short charging time and long cycle life. It has broad application prospects in the field of new energy vehicles. Electrode material is a key factor affecting the performance of supercapacitors, with RuO 2 Such noble metal oxides have large specific capacitance values ​​due to their pseudocapacitance principle, but their high price and toxicity limit their commercial applications. Some inexpensive metal oxides have become a research hotspot to replace noble metals as electrode materials for supercapacitors. Nickel cobalt ...

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Problems solved by technology

Leela et al. (Asymmetric Flexible Supercapacitor Stack, Nonoscale Research Letters, 2008) used the sol-gel method to prepare metal oxide / multi-walled carbon nanotube composite electrode materials, which showed excellent electrochemical performance, but the sol-gel method added surfactants, Easy to introduce impurities, and the cost is high; Kuan et al (Electrodeposition of Nickel and CobaltMixed Oxide / Carbon Nanotube Thin Films and Their Charge Storage Properties, J. Electorchem. / carbon nanotube coposites, Electrochim. Acta. 2007) and Wen et al. (A three dimensional vertically aligned multiwall carbon nanotube-NiCo 2 o 4 core-shell structure for novel high-performance supercapacitors, J. Mater.Chem. A, 2014) Cobalt-nickel oxide / carbon nanotube composites were prepared by electrochemical deposition method, which has long reaction time and high energy consumption; China The patent (CN1315139C) provides a method for compounding carbon nanotubes and transition oxides, using a binder to compound carbon nanotubes and transition metal oxides. The addition of binders will increase the internal resistance of the material, which is not conducive to the compounding materials as electrode materials for supercapacitors

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