Nickel cobalt base-carbon nanotube composite electrode material and preparation method thereof

A composite electrode and carbon nanotube technology, which is used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve the problems of reduced utilization of active materials, higher requirements for reaction conditions, and reduced electrochemical activity. The effect of agglomeration, easy dispersion and stable cycle performance

Inactive Publication Date: 2017-06-13
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the recycling process of nickel-cobalt double metal hydroxide electrode materials, different degrees of phase transitions will occur, and the volume change between different phases will damage the structure, resulting in the gap between the active materials and between the active materials and the current collector. The contact resistance between them increases, so the utilization rate of the active material decreases sharply, and the electrochemical activity decreases.
[0005] Chinese patent (CN105161313A) utilizes hydrothermal method to prepare a kind of nickel cobaltate/carbon nanotube composite electrode material, and its specific capacity reaches about 900F/g, an

Method used

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  • Nickel cobalt base-carbon nanotube composite electrode material and preparation method thereof
  • Nickel cobalt base-carbon nanotube composite electrode material and preparation method thereof
  • Nickel cobalt base-carbon nanotube composite electrode material and preparation method thereof

Examples

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Example Embodiment

[0026] Example 1

[0027] (1) Weigh 213.9mg of nickel chloride, 142.8mg of cobalt chloride and 427.9mg of ammonium chloride, and dissolve them in 30mL of deionized water. After mixing, the mixed solution is subjected to ultrasonic treatment for 10 to 30 minutes, and then the solution is stirred rapidly. .

[0028] (2) Weigh 110 mg of sodium hydroxide, dissolve it in 10 mL of deionized water, quickly pour the sodium hydroxide solution into the stirred mixed solution, continue to stir for 10 minutes, seal the reaction flask and place it in a 55°C oil bath. Take it out after 15 hours of reaction. When the reaction flask is cooled to room temperature, you can see that there is a green precipitate at the bottom of the flask. It is filtered with suction, washed with deionized water several times, and then placed in an oven at 60°C for 24 hours.

[0029] The XRD pattern of the supercapacitor electrode material nickel-cobalt double hydroxide prepared in this example is as follows figure 1 A...

Example Embodiment

[0033] Example 2

[0034] (1) Weigh 17.8 mg of carbon nanotubes modified with oxygen-containing functional groups, dissolve them in 30 mL of deionized water, and sonicate them for 20 to 120 minutes to disperse them.

[0035] (2) Weigh 213.9mg of nickel chloride, 142.8mg of cobalt chloride and 427.9mg of ammonium chloride, respectively, and dissolve them in the carbon nanotube solution in (1). After mixing, the mixed solution is subjected to ultrasonic treatment for 10min~30min , And then continue to stir the solution quickly.

[0036] (3) Weigh 110 mg of sodium hydroxide, dissolve it in 10 mL of deionized water, quickly pour the sodium hydroxide solution into the stirred mixed solution, continue to stir for 10 minutes, seal the reaction flask and place it in a 55°C oil bath. After 15 hours of reaction, take it out. When the reaction flask is cooled to room temperature, you can see that there is a green and black precipitate at the bottom of the flask. It is filtered with suction, wa...

Example Embodiment

[0042] Example 3

[0043] (1) Weigh 35.6 mg of carbon nanotubes modified with oxygen-containing functional groups, dissolve them in 30 mL of deionized water, and sonicate them for 20 to 120 minutes to disperse.

[0044] (2) Weigh 213.9mg of nickel chloride, 142.8mg of cobalt chloride and 427.9mg of ammonium chloride, respectively, and dissolve them in the carbon nanotube solution in (1). After mixing, the mixed solution is subjected to ultrasonic treatment for 10min~30min , And then continue to stir the solution quickly.

[0045] (3) Weigh 110 mg of sodium hydroxide, dissolve it in 10 mL of deionized water, quickly pour the sodium hydroxide solution into the stirred mixed solution, continue to stir for 10 minutes, seal the reaction flask and place it in a 55°C oil bath. After reacting for 15 hours, take it out. When the reaction flask is cooled to room temperature, you can see that there is a green black precipitate at the bottom of the flask. It is filtered with suction, washed wit...

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Abstract

The invention discloses a nickel-cobalt bimetallic hydroxide/carbon nanotube novel composite electrode material for super capacitors and a preparation method thereof. The method comprises finishing the surface of a carbon nanotube to form an aqueous solution with good dispersity; adding nickel salt, cobalt salt and an additive, and then adding an appropriate quantity of an alkali source, performing suction filtration, washing, and drying after reaction in an oil bath with a mild condition so as to obtain highly uniformly dispersed nickel-cobalt bimetallic hydroxide/carbon nanotube novel composite. The nickel-cobalt bimetallic hydroxide/carbon nanotube novel composite is used as the electrode material of the super capacitor so that both the double-layer capacitance of the carbon nanotube and the pseudocapacitance of the hydroxide can be used and the carbon nanotube has good electrical conductivity, dispersion promoting performance and mechanical strength. The optimized and synthesized novel composite electrode material has a specific capacitance value of 1558F/g when having a current density of 1A/g. When the current density is increased to 10A/g, the specific capacitance value is still maintained at 1358F/g, thereby achieving a retention rate of 87. 2% so that the novel composite electrode material has good magnification and good charge and discharge cycle stability. The method for synthesizing the material is simple, mild in condition, and cheap in raw material and is a good preparation method. The electrode material has excellent performance.

Description

technical field [0001] The invention relates to the field of preparation of novel electrode materials for supercapacitors, in particular to a novel nickel-cobalt double metal hydroxide / carbon nanotube composite electrode material and a preparation method thereof. Background technique [0002] In recent years, with the development of the global economy, the shortage of resources and energy has become increasingly serious, and the environmental pollution has become more serious. The search for clean and renewable new energy has become a major problem to be solved urgently for mankind. As an energy storage device, supercapacitor has the advantages of fast charging and discharging, long cycle life, green and pollution-free, etc. It has great application value in mobile communications, aerospace, electronic products, electric vehicles and other fields, and has received widespread attention. . Electrode materials are the core part of supercapacitors, and the development of electr...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/36H01G11/86
CPCY02E60/13H01G11/36H01G11/30H01G11/86
Inventor 储伟魏民周艳萍李敬黄青松
Owner SICHUAN UNIV
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