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Nickel hydroxide/graphene nano composite, preparation method thereof, supercapacitor electrode and supercapacitor

A nanocomposite material, supercapacitor technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology and other directions, can solve the problems of poor electrical conductivity of transition metal hydroxides, limited applications, etc., to improve the specific surface area. Effectiveness of utilization rate, improved utilization rate, high cycle life

Active Publication Date: 2016-11-23
嘉兴企远网信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Transition metal hydroxides are used as electrode materials in supercapacitors. They have the advantages of high specific capacitance, low price, and environmental protection. Applications on supercapacitors

Method used

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  • Nickel hydroxide/graphene nano composite, preparation method thereof, supercapacitor electrode and supercapacitor
  • Nickel hydroxide/graphene nano composite, preparation method thereof, supercapacitor electrode and supercapacitor
  • Nickel hydroxide/graphene nano composite, preparation method thereof, supercapacitor electrode and supercapacitor

Examples

Experimental program
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Embodiment 1

[0041] Preparation of graphite oxide: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4, Added in 0.5 hours, and continued to stir for 20 hours, the viscosity of the reactant increased, and the stirring was stopped to obtain a paste-like purple-red substance. After standing for 5 days, slowly add 500mL deionized water and 30mLH 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide.

[0042] Take 5.0 mg of graphite oxide, disperse it in 100 mL of deionized water, and sonicate for 1 hour to obtain solution A. Control the water temperature at 5-40°C, and the water temperature in this embodiment is 25°C. Weigh 0.6g of nickel chloride hexahydrate and dissolve it in 20mL of deionized water, stir evenly, add to solution A, and...

Embodiment 2

[0045] The preparation method of graphite oxide is with embodiment 1. Take 10.0 mg of graphite oxide, disperse it in 100 mL of deionized water, and sonicate for 1 hour to obtain solution A. Control the water temperature at 5-40° C., which is 30° C. in this embodiment. Weigh 1.2g of nickel chloride hexahydrate and dissolve it in 20mL of deionized water, stir well, add to solution A, and ultrasonicate for 30 minutes to obtain solution B. Take 1.0g of vitamin C and dissolve it in 15mL of deionized water, stir it evenly, add it to solution B, and sonicate for 30 minutes to obtain solution C. Dissolve 0.6g of urea in 15mL of deionized water, stir evenly, add to solution C, and sonicate the solution for 20 minutes to obtain solution D. Pour the solution D into a 200mL polytetrafluoroethylene reactor and react at 120°C for 24 hours.

[0046] The product was washed three times with deionized water and ethanol, respectively, and dried at 60°C for 10 hours to obtain a nickel hydroxide...

Embodiment 3

[0048] The preparation method of graphite oxide is with embodiment 1. Take 20.0 mg of graphite oxide, disperse it in 100 mL of deionized water, and sonicate for 1 hour to obtain solution A. Control the water temperature at 5-40° C., which is 30° C. in this embodiment. Weigh 1.6g of nickel chloride hexahydrate and dissolve it in 20mL of deionized water, stir well, add to solution A, and ultrasonicate for 30 minutes to obtain solution B. Take 1.0g of vitamin C and dissolve it in 15mL of deionized water, stir it evenly, add it to solution B, and sonicate for 30 minutes to obtain solution C. Dissolve 0.8g of urea in 15mL of deionized water, stir evenly, add to solution C, and sonicate the solution for 20 minutes to obtain solution D. Pour the solution D into a 200mL polytetrafluoroethylene reactor and react at 140°C for 12 hours.

[0049] The product was washed three times with deionized water and ethanol, and dried at 80°C for 6 hours to obtain nickel hydroxide / graphene nanocom...

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Abstract

The invention discloses a nickel hydroxide / graphene nano composite, a preparation method thereof, a supercapacitor electrode and a supercapacitor. The composite is formed by base material graphene and a nickel hydroxide nanosheet growing on the surface of the graphene in situ, and the composite integrally has a three-dimensional porous structure. A graphene-based composite is prepared by loading a transition metal hydroxide on the surface of the graphene with high specific surface area and excellent conductivity in a composition manner. Due to synergistic effect of all componenta of the composite, all components can mutually enhance advantages and avoid disadvantages; and meanwhile, long circle life, high power density and high stability of an electric double-layer capacitor and high specific capacitance characteristic of a pseudocapacitor are combined, thereby improving the comprehensive performances of the supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a nickel hydroxide / graphene nanocomposite material and a preparation method thereof, a supercapacitor electrode and a supercapacitor. Nickel nanosheets, and sheet-like nickel hydroxide / graphene self-assemble into a three-dimensional porous structure. Background technique [0002] Supercapacitors are also called electrochemical capacitors, and have the characteristics of short charging time, long service life, good temperature characteristics, high safety, energy saving and environmental protection. Supercapacitors have attracted considerable attention over the past few decades due to their higher power density and longer cycle life than secondary batteries, traditional electrostatic and electrolytic capacitors. Electrode materials are the key to improving the performance of supercapacitors, and they are also factors that determine the cost of superca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/86B82Y30/00B82Y40/00
CPCY02E60/13H01G11/30B82Y30/00B82Y40/00H01G11/36H01G11/86
Inventor 黄家锐李雪雪谷翠萍刘畅
Owner 嘉兴企远网信息科技有限公司
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