Nano-nickel oxide/graphene composite material and preparation method thereof

A technology of nano-nickel oxide and composite materials, which is applied in the field of electrochemistry and material synthesis, can solve the problems of easy agglomeration of NiO nano-materials, long charging time, and low power density, and achieve short preparation cycle, improved capacitance performance, and large output. Effect

Inactive Publication Date: 2011-09-14
JIANGSU SUNETECH NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the battery also has certain defects: such as long charging time, relatively low power density, etc.
[0004] NiO has become RuO due to its wide source, relatively cheap, and good capacitive behavior. 2 One of the ideal substitutes, but NiO has two very fatal shortcomings as a supercapacitor material: one is that the conductivity is relatively poor, and the other is that NiO nanomaterials are easy to agglomerate

Method used

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  • Nano-nickel oxide/graphene composite material and preparation method thereof
  • Nano-nickel oxide/graphene composite material and preparation method thereof
  • Nano-nickel oxide/graphene composite material and preparation method thereof

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Embodiment 1

[0027] Embodiment one: adopt Ni (NO 3 ) 2 Preparation of graphene / nickel oxide composites as nickel source

[0028] First, weigh 2.5g of potassium persulfate and 2.5g of phosphorus pentoxide, dissolve in 20ml of concentrated sulfuric acid, heat to 80°C and keep it warm, then add 3g of natural graphite, keep the temperature for 4.5h, cool to room temperature, and dilute with 500ml of deionized water After standing still for 20 hours, it was filtered and vacuum-dried at 60°C. Dissolve the above product in 120ml of concentrated sulfuric acid, and slowly add 15g of potassium permanganate into the above solution under ice bath conditions; stir at a constant temperature of 35°C for 2h, then slowly dilute with 250ml of water, and let it stand for 2h; add 700ml of deionized water Dilute, add 20ml (30%) to the above solution; then wash with 1L of 1:10 HCl solution; then filter and wash with 1L deionized water to obtain graphite oxide solution.

[0029] Take 50ml graphite oxide solut...

Embodiment 2

[0033] Embodiment two: adopt NiCl 2 ·6H 2 Preparation of graphene / nickel oxide composites with O as nickel source

[0034] Take 50ml of prepared 2.5mg / ml graphite oxide solution, add the same volume of deionized water to dilute and stir for 0.5h, then weigh 0.01mol nickel chloride hexahydrate (NiCl 2 ·6H 2 O) Prepare a 1M solution with deionized water, take 10ml nickel chloride solution and slowly add it dropwise to 50ml graphite oxide solution, stir for 0.5h, then take 1M NH prepared in advance 4 HCO 3 Add 15ml of the solution dropwise to the above solution, adjust the pH of the solution to 7.5 under the detection of a pH meter, then stir for 1 hour, filter with a suction filter bottle, then wash with absolute ethanol for 3 times, and then wash with deionized water for 3 times . The precursor of the graphene / nickel oxide composite material was obtained, and the precursor was vacuum-dried at 80°C for 12h, and then the prepared dry precursor sample was heated to 400°C for ...

Embodiment 3

[0035] Embodiment three: adopt NiSO 4 Preparation of graphene / nickel oxide composites as nickel source

[0036] Take 50ml of the prepared 2.5mg / ml graphite oxide solution, add the same volume of deionized water to dilute and stir for 1h, then weigh 2.62g of nickel sulfate to make a 1M solution, take 10ml of the prepared nickel sulfate solution and slowly add it dropwise to 50ml In the graphite oxide solution, stir for 1h, then take 15ml of 1M ammonium bicarbonate solution and add it dropwise to the above solution, use a pH meter to monitor the pH of the solution system in real time, when the pH is adjusted to 7.5, stop adding the ammonium bicarbonate solution dropwise, and then Stir for 1 hour. After the reaction is over, filter with a suction filter bottle, then wash with absolute ethanol for 3 times, and then repeat the same steps with deionized water for 3 times. The precursor of the graphene / nickel oxide material prepared in this way, the precursor is vacuum-dried at 80°C...

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Abstract

The invention relates to a nano-nickel oxide / graphene composite material and a preparation method thereof. The composite material is characterized in that: nickel oxide nano-particles uniformly grow on two sides of single-layer graphene to form a novel quasi-two-dimensional composite nano-material. The graphene serving as a substrate frame has good conductivity, and excellent conductivity among the nickel oxide particles is realized through the graphene substrate, so that the apparent electric conductivity of the composite material is improved. The sizes of the nickel oxide nano-particles growing on the graphane flake are between 1 and 10 nanometers; the plane size of the composite graphene nano-flake is between 0.1 and 100 microns, and the thickness of the composite graphene nano-flake is between 1 and 20 nanometers; and the weight percentage of the nickel oxide in the composite material is between 60 and 95 percent. The preparation method comprises two typical steps of: preparing a nano-nickel oxide / graphene precursor material by adopting a chemical solution method; and sintering to form a phase at high temperature in protection of an inert gas. The nano-nickel oxide / graphene composite material prepared by the method has high single electrode capacitance and good circulating performance, and is suitable for electrode materials of super capacitors.

Description

technical field [0001] The invention relates to a nano-nickel oxide / graphene composite material and a preparation method thereof. In particular, a graphene-based two-dimensional nanocomposite material used as a supercapacitor electrode material belongs to the technical field of electrochemistry and material synthesis. Background technique [0002] In recent years, with the continuous improvement of the requirements for various indicators of energy storage devices in practical applications, the current standard design capabilities of energy storage devices can no longer meet the actual needs. Batteries have been widely used in automotive, electronics, communications, aerospace, military, medical, postal and other fields for a long time. The energy density of batteries is relatively high, which can meet the application needs of many occasions. However, the battery also has certain defects: such as long charging time and relatively low power density. In some high-pulse applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 赵兵宋劲松刘鹏徐为文方涛焦正吴明红
Owner JIANGSU SUNETECH NEW ENERGY TECH CO LTD
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