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Preparation method of cobaltous sulfide nickel/graphene composite gel and application

A graphene composite, cobalt-nickel sulfide technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrolytes, etc., can solve the problems that affect the energy storage cycle stability and specific capacity, and the active sites cannot be fully exposed.

Inactive Publication Date: 2018-07-06
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure nano-cobalt sulfide particles of nickel are easy to agglomerate, so that the active sites cannot be fully exposed, which seriously affects the cycle stability and specific capacity of energy storage.

Method used

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  • Preparation method of cobaltous sulfide nickel/graphene composite gel and application
  • Preparation method of cobaltous sulfide nickel/graphene composite gel and application
  • Preparation method of cobaltous sulfide nickel/graphene composite gel and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. Preparation of cobalt-nickel sulfide / graphene composite gel

[0042] (1) First, graphene oxide is added to 95wt% ethanol, and ultrasonically dispersed to obtain a stably dispersed 1 mg / mL graphene oxide alcohol solution;

[0043] (2) Then according to the feed ratio of 1.68:1 (with the synthesized NiCo 2 S 4 In terms of the ratio of the mass of nickel to the mass of graphene), 0.2908g (1mmol) Ni (NO 3 ) 2 ·6H 2 O, 0.5821g (2mmol) Co (NO 3 ) 2 ·6H 2 O and 0.3005g (4mmol) thioacetamide are dissolved in the graphene oxide alcohol solution of 35mL, 1mg / mL, after stirring evenly, ultrasonic 3h, obtain mixed solution;

[0044] (3) Then transfer the obtained mixed solution to a 50mL autoclave, lock it, place the autoclave in a constant temperature blast drying oven, and heat the reaction at 150°C for 24h;

[0045] (4) After the heating reaction is completed, the autoclave is cooled to room temperature, and the black columnar hydrogel reaction product obtained by the...

Embodiment 2

[0053] 1. Preparation of cobalt-nickel sulfide / graphene composite gel

[0054] (1) First, graphene oxide is added to 95wt% ethanol, and ultrasonically dispersed to obtain a stably dispersed 2 mg / mL graphene oxide alcohol solution;

[0055] (2) Then according to the feed ratio of 0.84:1 (with the synthesized NiCo 2 S 4 In terms of the ratio of the mass of nickel to the mass of graphene), 0.2908g (1mmol) Ni (NO 3 ) 2 ·6H 2 O, 0.5821g (2mmol) Co (NO 3 )2 ·6H 2 O and 0.3005g (4mmol) thioacetamide are dissolved in the graphene oxide alcohol solution of 35mL, 2mg / mL, after stirring evenly, ultrasonic 3h, obtain mixed solution;

[0056] (3) Then transfer the obtained mixed solution to a 50mL autoclave, lock it, place the autoclave in a constant temperature blast drying oven, and heat the reaction at 150°C for 24h;

[0057] (4) After the heating reaction is completed, the autoclave is cooled to room temperature, and the black columnar hydrogel reaction product obtained by the r...

Embodiment 3

[0065] 1. Preparation of cobalt-nickel sulfide / graphene composite gel

[0066] (1) First, graphene oxide is added to 95wt% ethanol, and ultrasonically dispersed to obtain a stably dispersed 3 mg / mL graphene oxide alcohol solution;

[0067] (2) Then according to the feed ratio of 0.56:1 (with the synthesized NiCo 2 S 4 In terms of the ratio of the mass of nickel to the mass of graphene), 0.2908g (1mmol) Ni (NO 3 ) 2 ·6H 2 O, 0.5821g (2mmol) Co (NO 3 ) 2 ·6H 2 O and 0.3005g (4mmol) thioacetamide are dissolved in the graphene oxide alcohol solution of 35mL, 3mg / mL, after stirring evenly, ultrasonic 3h, obtain mixed solution;

[0068] (3) Then transfer the obtained mixed solution to a 50mL autoclave, lock it, place the autoclave in a constant temperature blast drying oven, and heat the reaction at 150°C for 24h;

[0069] (4) After the heating reaction is completed, the autoclave is cooled to room temperature, and the black columnar hydrogel reaction product obtained by the...

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Abstract

The invention discloses a preparation method of cobaltous sulfide nickel / graphene composite gel. The following preparation raw materials are employed: graphene oxide (GO), cobalt salt, nickel salt, thioacetamide and 95wt% of ethyl alcohol and the like. The preparation method comprises: graphene oxide and ethyl alcohol are fixed and ultrasonic preparation is carried out to obtain a graphene oxide alcoholic solution; and in-situ growth of a cobaltous sulfide nickel microsphere on a graphene oxide sheet is carried out by a one-step hydrothermal method to obtain cobaltous sulfide nickel / graphene composite gel. According to the invention, the cost is low; and the preparation process is simple. The prepared cobaltous sulfide nickel / graphene composite gel has excellent electrochemical performanceand can be used as a positive electrode material of an asymmetric super capacitor.

Description

technical field [0001] The invention relates to the technical field of transition metal sulfide-carbon materials, in particular to a preparation method and application of a cobalt-nickel sulfide / graphene composite gel. Background technique [0002] Compared with secondary batteries, supercapacitors, as a new generation of energy storage devices, have outstanding advantages such as high power density, long cycle life, and fast charging. They have important applications in portable electronic products and pure electric vehicles with higher power output requirements. . However, the current specific capacity and energy density of supercapacitors are relatively low, and the electrode material of supercapacitors is the key to affecting its specific capacity and energy density. [0003] Graphene has excellent properties, such as high electrical conductivity, excellent mechanical properties, high specific surface area, light weight and low density, and good chemical stability. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/56H01G11/86
CPCY02E60/13H01G11/56H01G11/86
Inventor 王森林何涛斌张笑许琳叶俊辉黎辉常
Owner HUAQIAO UNIVERSITY
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