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Method for manufacturing porous flaky NiCo2O4 and grapheme composite capacitive material

A graphene composite and flake technology, applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of poor conductivity, troublesome operation, small capacitance, etc., achieve good electrochemical stability, improve contact area, and improve conductivity performance effect

Active Publication Date: 2014-12-24
江阴智产汇知识产权运营有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]At present, with the rapid development of the economy, the social problems caused by energy shortages are becoming more and more prominent, making people's demand for sustainable and efficient energy storage devices become It is more urgent; due to the characteristics of short charging time, long service life, good temperature characteristics, energy saving and environmental protection, supercapacitors have attracted widespread attention and have broad application prospects; the electrode materials usually used in supercapacitors are Metal oxides and conductive polymers, but this type of electrode material has limited its application in supercapacitors due to its small capacitance and poor conductivity; in recent years, research has found that combining electrode active materials with carbon materials is a An effective way to improve the performance of material supercapacitors
[0003]Recently, nickel cobaltate (NiCo2O4) has been found to be more More excellent capacitance performance is considered to be an ideal supercapacitor electrode material; various nickel cobalt oxide electrode materials have been prepared at present, however, these nickel cobalt oxide electrode materials still have poor conductivity and low cycle stability. Not high and other shortcomings, can not meet the performance requirements as an excellent supercapacitor; because the porous sheet structure material can increase the contact area with the electrolyte solution to the greatest extent, which is conducive to the improvement of its capacitance performance, the present invention makes nickel cobaltate Porous sheet structure, and compounded with graphene, because graphene has a special two-dimensional layered structure and excellent electrical conductivity, this material can not only increase the contact area between the electrode material and the electrolyte, but also enhance the electrode material. Electrical conductivity, this porous sheet NiCo2O4 / graphene composite material is used as a supercapacitor electrode material, showing excellent capacitance performance
[0004] Peng et al. published a method for preparing flake NiCo2O4 / graphene composite method, the prepared compound exhibits better capacitive properties when used as supercapacitor electrode materials; however, the preparation method is a hydrothermal method, and the operation is relatively troublesome. In the present invention, we successfully prepared NiCo 2O4 / graphene composite capacitor material, which greatly reduces the difficulty of operation

Method used

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  • Method for manufacturing porous flaky NiCo2O4 and grapheme composite capacitive material
  • Method for manufacturing porous flaky NiCo2O4 and grapheme composite capacitive material
  • Method for manufacturing porous flaky NiCo2O4 and grapheme composite capacitive material

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Experimental program
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Effect test

Embodiment 1

[0027] Example 1: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.250 mmol Co(NO 3 ) 2 . 6H 2 O and 0.125 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 3 h; the obtained black product was centrifuged, and washed with water and ethanol for 3 times, at 45 o C and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

Embodiment 2

[0028] Example 2: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.250 mmol Co(NO 3 ) 2 . 6H 2 O and 0.125 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 4 h; the obtained black product was centrifuged, and washed with water and ethanol three times respectively, at 45 o C and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

Embodiment 3

[0029] Example 3: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.500 mmol Co(NO 3 ) 2 . 6H 2 O and 0.250 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 3 h; the obtained black product was centrifuged, and washed with water and ethanol for 3 times, at 45 oC and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

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Abstract

The invention relates to a method for manufacturing a porous flaky NiCo2O4 and grapheme composite capacitive material, and belongs to the field of nano composite material manufacturing. According to the method, a graphite oxide, cobalt nitrate and nickel nitrate are dissolved in deionized water in an ultrasonic mode and stirred, a certain amount of hexamethylene tetramine is added, a reflux reaction is carried out for 3-4 hours at the temperature of 90 DEG C, sediments are collected, the collected sediments are calcined in an air atmosphere for 2 hours at the temperature of 330 DEG C, and the porous flaky NiCo2O4 and grapheme nano composite material is obtained. In the manufactured porous flaky NiCo2O4 and grapheme composite capacitive material, porous flaky NiCo2O4 is completely attached to the surface of a grapheme piece. By means of the composite structure, conductivity of the material is improved, and the contact area of the material and an electrolyte solution is greatly improved, so that the composite material has high specific capacitance and good electrochemical stability and can be possibly used as a super-capacitor electrode material.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite materials, in particular to a porous sheet NiCo 2 o 4 / The preparation method of graphene composite capacitance material. Background technique [0002] At present, with the rapid development of the economy, the social problems caused by energy shortages are becoming more and more prominent, making people's demand for continuous and efficient energy storage devices more urgent; supercapacitors have short charging time, long service life, The characteristics of good temperature characteristics, energy saving and environmental protection have attracted widespread attention and have broad application prospects; the electrode materials for supercapacitors are usually metal oxides and conductive polymers, but these electrode materials are due to their own Small capacitance and poor conductivity restrict its popularization and application in supercapacitors; in recent years, studies have fou...

Claims

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Application Information

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IPC IPC(8): H01G11/86
Inventor 沈小平马连波季振源
Owner 江阴智产汇知识产权运营有限公司
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