a ni(oh) 2 /Preparation method of multilayer graphene composites

A multi-layer graphene and composite material technology, applied in the field of materials, can solve the problems of large internal resistance of electrodes, poor electrical conductivity, poor rate performance and cycle performance, etc., and achieve the effects of easy control, improved redox activity, and simple process

Active Publication Date: 2020-09-15
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lamellar Ni(OH) 2 Has a large specific capacitance, but its conductivity is poor
If it is used as an electrode material alone, it will cause defects such as large internal resistance of the electrode, poor rate performance and cycle performance.

Method used

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  • a ni(oh) <sub>2</sub> /Preparation method of multilayer graphene composites
  • a ni(oh) <sub>2</sub> /Preparation method of multilayer graphene composites
  • a ni(oh) <sub>2</sub> /Preparation method of multilayer graphene composites

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preparation example Construction

[0025] figure 1 Be the Ni(OH) of the embodiment of the present invention 2 The preparation method step flowchart of / multilayer graphene composite material comprises the following steps:

[0026] Step 1, measure DMF (N,N-dimethylformamide) and distilled water with a volume ratio of 8:2, and mix them as a mixed solvent. The volume of the two solvents and the volume of the mixed solvent.

[0027] Step 2, add expanded graphite, and ultrasonically vibrate for 3 hours to obtain a mixed solution of multilayer graphene; wherein, the mass concentration of expanded graphite relative to the mixed solvent is 2 mg / mL, and the oxygen content on the surface of the multilayer graphene is less than 3%, and the number of layers Less than 100 layers.

[0028] Step 3: Add urea and nickel chloride hexahydrate to the multilayer graphene mixed solvent, stir for 5-10 minutes, pour the solution into a hydrothermal reaction kettle, keep it at 150°C for 2 hours, and then cool to room temperature.

...

Embodiment 1

[0031] Mix 8mLDMF and 2mL distilled water as a mixed solvent, add 20mg of expanded graphite, and obtain the required multilayer graphene solution after ultrasonic oscillation for 3 hours, add 30mg CO(NH2) to the mixed solution 2 , 95.2mg NiCl 2 ·6H 2 O and stirred for 10 minutes; pour the solution into a hydrothermal reaction kettle, keep it warm at 150°C for 2 hours, and then cool to room temperature; take out the product and wash it with alcohol for 3 times, and then wash it with water for 3 times, and finally use a drying oven at 60°C Drying for 24 hours to obtain Ni(OH) 2 / Multilayer graphene composites.

Embodiment 2

[0033] Mix 8mLDMF and 2mL distilled water as a mixed solvent, add 20mg expanded graphite, and obtain the required multilayer graphene solution after ultrasonic oscillation for 3 hours, add 40mg CO(NH2) to the mixed solution 2 , 119mg NiCl 2 ·6H 2 O and stirred for 5 minutes; pour the solution into a hydrothermal reaction kettle, keep it warm at 150°C for 2 hours, and then cool to room temperature; take out the product and wash it with alcohol for 3 times, and then wash it with water for 3 times, and finally use a drying oven at 60°C Drying for 24 hours to obtain Ni(OH) 2 / Multilayer graphene composites.

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Abstract

The invention relates to a preparation method of Ni (OH) 2 / multilayer graphene composite material. The lamellar Ni (OH) 2 has large specific capacitance, but its conductivity is poor. If it is used asthe electrode material of supercapacitor alone, it will cause the internal resistance of the electrode to be large, the rate performance and cycle performance to be poor and so on. The invention provides a preparation method of a simple Ni (OH) 2 / multilayer graphene composite material, wherein in the graphene / metal hydroxide composite material, the excellent cycle stability of the graphene and the high capacity of the metal hydroxide are greatly improved. The supercapacitor with high performance is obtained when the composite material is used as electrode material of supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a Ni(OH) 2 The preparation method of multilayer graphene composite material. The prepared materials have good application value in energy storage applications, energy saving and environmental protection. Background technique [0002] Supercapacitor refers to a new type of energy storage device between traditional capacitors and rechargeable batteries, and its capacity can reach hundreds to thousands of farads. Compared with traditional capacitors, it has larger capacity, specific energy or capacity density, wider operating temperature range and extremely long service life; and compared with batteries, it has higher specific power and is environmentally friendly No pollution. Supercapacitor is a new type of energy storage device with high power density and long cycle life. Carbon materials, metal hydroxides, and conductive polymers are three common electrode materials for su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/36H01G11/30H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 徐军明张泽豪宋开新武军胡晓萍
Owner HANGZHOU DIANZI UNIV
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