CoNiFe-LDH/multilayer graphene high-performance composite energy storage material and preparation method thereof

A composite energy storage material and multi-layer graphene technology, applied in the field of materials, can solve the problems of unfavorable practical application of composite materials, poor rate performance and cycle performance, and high process control, achieve strong metal ion load capacity, and improve capacitance effect. , the effect of thin layer thickness

Active Publication Date: 2018-08-03
嘉善县国创新能源研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the research of CoNi-LDH (CoNi layer double metal hydroxide) has shown that it has a large specific capacitance, but its disadvantage is that its conductivity is poor, and it will cause large internal resistance of the electrode, high rate performance and poor performance when used as an electrode material alone. Poor cycle performance, etc.
However, the process of this method is complicated and the control of the process is high, which is not conducive to the practical application of the composite material.

Method used

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  • CoNiFe-LDH/multilayer graphene high-performance composite energy storage material and preparation method thereof
  • CoNiFe-LDH/multilayer graphene high-performance composite energy storage material and preparation method thereof
  • CoNiFe-LDH/multilayer graphene high-performance composite energy storage material and preparation method thereof

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preparation example Construction

[0033] see figure 1 , shows the flow chart of the preparation method step of the CoNiFe-LDH / multilayer graphene composite material of the embodiment of the present invention, comprises the following steps:

[0034] S10, measure DMF (N,N-dimethylformamide) and distilled water with a volume ratio of 8:2, mix them as a mixed solvent, and use the volume of the two as a mixed solvent for calculation;

[0035] S20, adding expanded graphite and ultrasonically vibrating for 2 to 4 hours to obtain a mixed solution of multilayer graphene;

[0036] Wherein the expanded graphite is 2 mg / mL relative to the mixed solvent, the oxygen content on the surface of the multilayer graphene is less than 3%, and the number of layers is less than 100.

[0037] S30, adding ferrous chloride tetrahydrate, cobalt acetate tetrahydrate, nickel chloride hexahydrate and anhydrous sodium acetate into the multilayer graphene mixed solvent, stirring for 5-10 minutes, pouring the solution into a hydrothermal rea...

Embodiment 1

[0042] 8mlDMF and 2ml distilled water are mixed as a mixed solvent, 20mg expanded graphite is added, and the required multilayer graphene solution is obtained after ultrasonic oscillation for 2 hours, and 150mg Co(CH 3 COO) 2 4H 2 O, 71mg NiCl 2 ·6H 2 O, 120mg FeCl 2 4H 2 O, (Co:Ni:Fe=1:0.5:1), 50mg CH 3 COONa was stirred for 5 minutes; the solution was poured into a hydrothermal reaction kettle, kept at 120°C for 1 hour, and then cooled to room temperature; the reactant was taken out and centrifuged three times with alcohol and water respectively, and finally dried at 60°C in a drying oven for 24 hours to obtain CoNiFe-LDH / multilayer graphene composites.

Embodiment 2

[0044] 8mlDMF and 2ml distilled water are mixed as a mixed solvent, 20mg expanded graphite is added, and the required multilayer graphene solution is obtained after ultrasonic oscillation for 2 hours, and 150mg Co(CH 3 COO) 2 4H 2 O, 142mg NiCl 2 ·6H 2 O, 100mg FeCl 2 4H 2 O, (Co:Ni:Fe=1:1:0.83),, 50mg CH 3 COONa was stirred for 5 minutes; the solution was poured into a hydrothermal reaction kettle, kept at 120°C for 1 hour, and then cooled to room temperature; the reactant was taken out and centrifuged three times with water, respectively, and finally dried in a drying oven at 60°C for 24 hours Obtain CoNiFe-LDH / multilayer graphene composite material.

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Abstract

The invention discloses a CoNiFe-LDH / multilayer graphene high-performance composite energy storage material and a preparation method thereof. the preparation method comprises the steps of: measuring DMF and distilled water with a volume ratio of 8:2, and mixing the DMF and the distilled water to serve as a mixed solvent; adding expanded graphite into the mixed solvent, carrying out ultrasonic processing on the solution for 2 to 4 hours to obtain a multi-layer graphene mixed solution; adding cobalt acetate tetrahydrate, ferrous chloride tetrahydrate, nickel chloride hexahydrate and anhydrous sodium acetate into the mixed solution, stirring the solution for 5 to 10 minutes, pouring the solution into a hydrothermal reaction kettle, maintaining the temperature of the solution at 120 DEG C for1 hour, and then cooling the solution to room temperature; taking out a reactant and centrifugally washing the reactant with alcohol and water for three times, and drying the reactant in a 60 DEG C oven for 24 hours to obtain a dry CoNiFe-LDH / multilayer graphene composite material. According to the CoNiFe-LDH / multilayer graphene high-performance composite energy storage material and the preparation method thereof, a method of complexing metal by means of organic molecules is adopted for preparing laminar multi-element metal hydroxide ont eh surface of multilayer graphene which does not containoxygen functional groups, and the process is simple and suitable for production.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a CoNiFe-LDH / multilayer graphene composite material and a preparation method thereof. The prepared material has use value in the field of energy storage, especially in supercapacitor electrode materials. Background technique [0002] Supercapacitors are used in many fields, such as hybrid electric vehicles and built-in power supplies, and hybrid power supplies with wind power generation devices or solar cells. Therefore, supercapacitors have become a research hotspot, and the main research purpose at present is to improve the energy density of supercapacitors. As a supercapacitor material, sheet double metal hydroxide not only has a large specific surface area, but also has a very large redox capacitance (pseudocapacitance), thereby greatly improving the specific capacitance of the material. Among them, the research of CoNi-LDH (CoNi layer double metal hydroxide) h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/36Y02E60/13
Inventor 徐军明廖堃胡晓萍宋开新武军高慧芳姚亚韩震吴凡
Owner 嘉善县国创新能源研究院
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