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Method of preparing nickel cobaltite/carbon nanotube composite materials

A carbon nanotube, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of long reaction time, increase material internal resistance, high energy consumption, and achieve good electrical Chemical stability, high specific capacitance value, environmentally friendly effect

Inactive Publication Date: 2015-12-16
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Leela et al. (AsymmetricFlexibleSupercapacitorStack, NonoscaleResearchLetters, 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, which easily introduced impurities. 而且成本较高;Kuan等(ElectrodepositionofNickelandCobaltMixedOxide / CarbonNanotubeThinFilmsandTheirChargeStorageProperties,J.Electorchem.soc.,2006)、Fan等(Preparationandcapacitivepropertiesofcobalt-nickeloxides / carbonnanotubecoposites,Electrochim.Acta.2007)和Wen等(Athreedimensionalverticallyalignedmultiwallcarbonnanotube-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, which has a long reaction time and high energy consumption; Chinese patent (CN1315139C) provides A method for compounding carbon nanotubes and transition oxides is proposed. The carbon nanotubes and transition metal oxides are compounded by using a binder. The addition of the binder will increase the internal resistance of the material, which is not conducive to the composite material being used as a supercapacitor electrode. Material

Method used

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  • Method of preparing nickel cobaltite/carbon nanotube composite materials
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  • Method of preparing nickel cobaltite/carbon nanotube composite materials

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specific Embodiment approach 1

[0014] Specific embodiment one: a kind of preparation method of nickel cobaltate / carbon nanotube composite nano-magnetic material is specifically finished according to the following steps: 1.5mmolNi(NO 3 ) 2 ·6H 2 O and 3mmolCo(NO 3 ) 2 ·6H 2 O was dissolved in 20ml of diethylene glycol, stirred at 80°C until the solution was prepared to contain Ni 2+ / Co 2+ Mixed metal solution A with a molar ratio of 1:2; dissolve 9mmol NaOH and 30mg carbon nanotubes in 40ml diethylene glycol, and ultrasonically disperse at 80°C for 30min to form solution B; add solution B dropwise to solution A A mixed solution was obtained; the mixed solution was fully stirred evenly at 80°C, moved into a reaction kettle, and replaced with CO 2 , after replacement the CO 2 The pressure is increased to 10MPa; put the reactor into an oil bath, set the stirring rate to 400r / min, the temperature to 200°C, and the reaction time to be 8h; the resulting product is washed with ethanol and distilled water un...

specific Embodiment approach 2

[0015] Specific embodiment two: a kind of preparation method of nickel cobaltate / carbon nanotube composite nano-magnetic material is specifically finished according to the following steps: 1.5mmolNi(NO 3 ) 2 ·6H 2 O and 3mmolCo(NO 3 ) 2 ·6H 2 O was dissolved in 10ml of diethylene glycol, stirred at 80°C until the solution was prepared to contain Ni 2+ / Co 2+ Mixed metal solution A with a molar ratio of 1:2; dissolve 7mmol NaOH and 30mg carbon nanotubes in 20ml diethylene glycol, and disperse ultrasonically at 80°C for 30min to form solution B; add solution B dropwise to solution A A mixed solution was obtained; the mixed solution was fully stirred evenly at 80°C, moved into a reaction kettle, and replaced with CO 2 , after replacement the CO 2 The pressure is increased to 10MPa; put the reactor into an oil bath, set the stirring rate to 400r / min, the temperature to 200°C, and the reaction time to be 8h; the resulting product is washed with ethanol and distilled water un...

specific Embodiment approach 3

[0016]Specific embodiment three: a kind of preparation method of nickel cobaltate / carbon nanotube composite nano-magnetic material, specifically finish according to the following steps: 1.5mmolNi(NO 3 ) 2 ·6H 2 O and 3mmolCo(NO 3 ) 2 ·6H 2 O was dissolved in 20ml of diethylene glycol, stirred at 80°C until the solution was prepared to contain Ni 2+ / Co 2+ Mixed metal solution A with a molar ratio of 1:2; 9mmol NaOH and 60mg carbon nanotubes were dissolved in 40ml diethylene glycol, and ultrasonically dispersed at 80°C for 30min to form solution B; the solution B was added dropwise to solution A A mixed solution was obtained; the mixed solution was fully stirred evenly at 80°C, moved into a reaction kettle, and replaced with CO 2 , after replacement the CO 2 The pressure is increased to 10MPa; put the reactor into an oil bath, set the stirring rate to 400r / min, the temperature to 200°C, and the reaction time to be 8h; the resulting product is washed with ethanol and dist...

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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 method for preparing nano-nickel cobaltate supported by carbon nanotubes. Background technique [0002] In recent years, due to its high power density, short charging time and long cycle life, supercapacitors are widely used in communication, aerospace, large industrial equipment, microelectronic devices and many other occasions that require instantaneous release of large currents, especially 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 due to their pseudocapacitive principle, but their high price and toxicity limit their commercial applications. Some cheap metal oxides instead of noble metals as electrode materials for supercapacitors have become a research hotspot. Nickel cobalt oxide (NiCo 2 o 4 ...

Claims

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Application Information

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IPC IPC(8): H01G11/36H01M4/36H01M4/583H01M4/587C01B31/02C01B31/04B82Y30/00
CPCY02E60/10Y02E60/13
Inventor 徐靖才王新庆王攀峰洪波彭晓领金红晓金顶峰葛洪良
Owner CHINA JILIANG UNIV
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