Method for preparing supercapacitor electrode material through cobalt-nickel bimetallic oxide and graphene

A double metal oxide and supercapacitor technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of toxicity, influence on the electrochemical performance of materials, expensive organic solvents, etc., and achieve broad application prospects, Good for electrochemical performance and good uniformity

Inactive Publication Date: 2017-07-07
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, stripping agent or intercalation agent is used for the stripping of double metal hydroxide, and it can only be carried out in organic solvent, (J. Am. Chem. Soc., 2007, 129: 5257-5263; American Chemical Science, 2007, Vol. 129: 5257 pages) (Electrochim.Acta, 2015, 152: 117-125; Electrochemistry, 2015, Vol. 152: 117 pages)
These stripping agents or intercalating agents will affect the electrochemical performance of the material, and most of the organic solvents are expensive and toxic

Method used

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  • Method for preparing supercapacitor electrode material through cobalt-nickel bimetallic oxide and graphene
  • Method for preparing supercapacitor electrode material through cobalt-nickel bimetallic oxide and graphene
  • Method for preparing supercapacitor electrode material through cobalt-nickel bimetallic oxide and graphene

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Embodiment 1

[0037] (1) Add 6 g Co(NO 3 ) 2 ·6H 2 O with 0.6 g Ni(NO3 ) 2 ·6H 2 O was dissolved in 200 mL of deionized water, and ammonia water was added to react, and the pH of the solution was adjusted to 9, and reacted for 2 hours to obtain a cobalt-nickel double metal hydroxide, which was then filtered and washed until neutral. Add cobalt-nickel double metal hydroxide to 2000 mL deionized water, and ultrasonicate for 3 hours in an ultrasonic cleaner with an ultrasonic power of 500 W to obtain a dispersion of cobalt-nickel double metal hydroxide nanosheets.

[0038] (2) Add 20 mL of the graphene oxide aqueous dispersion with a concentration of 5 mg / mL into the cobalt-nickel bimetal hydroxide nanosheet dispersion with a stirring speed of 1000 r / min, and keep stirring for 1 hour to make the two different. The resulting solution was filtered and dried in a freeze dryer at -50°C for 8 hours to obtain a cobalt-nickel double hydroxide and graphene oxide composite precursor.

[0039] (3) ...

Embodiment 2

[0042] (1) Add 1 g Co(NO 3 ) 2 ·6H 2 O with 0.25 g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 100 mL of deionized water, and ammonia water was added to react, and the pH of the solution was adjusted to 8, and reacted for 2 hours to obtain a cobalt-nickel double metal hydroxide, which was then filtered and washed until neutral. Add cobalt-nickel double metal hydroxide to 2000 mL deionized water, and ultrasonicate for 2 hours in an ultrasonic cleaner with an ultrasonic power of 300 W to obtain a dispersion of cobalt-nickel double metal hydroxide nanosheets.

[0043] (2) Add 10 mL of the graphene oxide aqueous dispersion with a concentration of 2.5 mg / mL into the cobalt-nickel double hydroxide nanosheet dispersion with a stirring speed of 1000 r / min, and keep stirring for 1 hour to make the two The resulting solution was filtered and dried in a freeze dryer at -50°C for 8 hours to obtain a cobalt-nickel double hydroxide and graphene oxide composite precursor.

[0044] (3) The abo...

Embodiment 3

[0047] (1) 1.19 g CoCl 2 ·6H 2 O with 1.19 g NiCl 2 ·6H 2 O was dissolved in 50 mL of deionized water, and ammonia water was added to react, and the pH of the solution was adjusted to 10, and reacted for 1 hour to obtain a cobalt-nickel double metal hydroxide, which was then filtered and washed until neutral. The cobalt-nickel double hydroxide was added into 2000 mL deionized water, and ultrasonicated in an ultrasonic cleaner with an ultrasonic power of 400 W for 1 hour to obtain a dispersion of cobalt-nickel double hydroxide nanosheets.

[0048] (2) Add 15.5 mL of graphene oxide aqueous dispersion with a concentration of 1.5 mg / mL into the cobalt-nickel double hydroxide nanosheet dispersion with a stirring speed of 1000 r / min, and keep stirring for 1 hour to make the two heterogeneous Assemble, filter the resulting solution, and dry in a freeze dryer at -50 °C for 8 hours to obtain a cobalt-nickel double metal hydroxide and graphene oxide composite precursor.

[0049] (3)...

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Abstract

The invention discloses a method for preparing supercapacitor electrode material through cobalt-nickel bimetallic oxide and graphene. According to the method, cobalt-nickel bimetallic hydroxide is stripped in deionized water, and graphene oxide having negative charges and the cobalt-nickel bimetallic hydroxide having positive charges are heterogeneously assembled so that compounding of the graphene oxide and the cobalt-nickel bimetallic hydroxide at the nanoscale can be realized. The reaction is controllable, and the prepared layered cobalt-nickel oxide and graphene nanocomposite material has great uniformity and has high specific capacitance, great rate performance and ultra-long cycle life when it is used for the supercapacitor electrode material so as to be wide in application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of supercapacitor materials, in particular to a method for preparing supercapacitor electrode materials from cobalt-nickel double metal oxide and graphene. [0002] technical background [0003] Composite materials can take advantage of the synergy between single components to exhibit high electrochemical performance and are widely used in supercapacitors (Energy Environ.Sci., 2015, 8:702-730; Energy and Environmental Science, 2015 Vol. 8: 702 pages) (NanoEnergy, 2016, 19:210-221; Nano Energy, 2016, Vol. 19: 210). [0004] Graphene, a new type of carbon material with a two-dimensional planar single atomic layer structure, has shown great promise in the field of supercapacitors because of its unique characteristics of high specific surface area, high electrical conductivity, high mechanical strength, and good flexibility. Great application potential (Nat. Mater., 2011, 10:424-428; Natural Materials, 2011...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/46H01G11/36
CPCY02E60/13H01G11/86H01G11/24H01G11/30H01G11/36H01G11/46
Inventor 吕春祥李倩陈成猛谢莉婧袁淑霞刘茜秀
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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