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Preparation method of nano-nickel oxide for electrode material of supercapacitor, and nano-nickel oxide prepared by method

A technology of nano-nickel oxide and supercapacitor, which is applied in nanotechnology for materials and surface science, nickel oxide/nickel hydroxide, nanotechnology, etc., can solve the problems of time-consuming, etc., achieve short time-consuming and reduce production costs , the effect of reducing energy consumption

Active Publication Date: 2013-11-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The preparation methods of nano-nickel oxide provided in the above-mentioned documents all need to be completed in a relatively harsh environment and take a long time.

Method used

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  • Preparation method of nano-nickel oxide for electrode material of supercapacitor, and nano-nickel oxide prepared by method
  • Preparation method of nano-nickel oxide for electrode material of supercapacitor, and nano-nickel oxide prepared by method

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Embodiment 1

[0043] Choline chloride and urea were stirred and mixed at a molar ratio of 1:2 at 75° C. to obtain a choline chloride-based deep eutectic solvent. 15.00g NiCl 2 ·6H 2 O was dissolved in 1 liter of choline chloride-based deep eutectic solvent, at this time the NiCl in the reaction solution 2 The concentration is 15g / L, and the magnetic stirring is uniform. At 130°C, quickly add 200ml of water to the above 1 liter of reaction solution. During the dropwise addition, the reaction solution was kept stirring at a high speed (greater than 750r / min), and reacted for 40 minutes. The precipitated product was separated by centrifugation, washed three times with methanol and once with deionized water, dried at 60 °C and annealed at 300 °C for 4 h to obtain the supercapacitor electrode material - flower-like nano-NiO.

[0044] The scanning electron micrograph of the figure 1 It can be seen from the figure that the average size of flower-like nano-NiO is 100nm, and the size distributio...

Embodiment 2

[0046] Choline chloride and urea were stirred and mixed at 75° C. according to a molar ratio of 1:2 to obtain a choline chloride-based deep eutectic solvent. 20.00g NiCl 2 ·6H 2 O was dissolved in 1 liter of choline chloride-based deep eutectic solvent, at this time the NiCl in the reaction solution 2 2H 2 The concentration of O is 20g / L, and the magnetic stirring is uniform. At 140°C, quickly add 150ml of water (H 2 O), during the dropwise addition, the reaction solution was kept stirring at a high speed, and then reacted for 40min. The precipitated product was separated by centrifugation, then washed three times with methanol and once with deionized water, and finally dried at 60°C and annealed at 250°C for 4 hours to obtain flower-shaped nano-NiO with a grain size of 4-7nm and a BET specific surface area 78.5m 2 / g.

Embodiment 3

[0048] Choline chloride and urea were stirred and mixed at 75° C. according to a molar ratio of 1:2 to obtain a choline chloride-based deep eutectic solvent. 15.00g NiCl 2 ·6H 2 O was dissolved in 1 liter of choline chloride-based deep eutectic solvent, at this time the NiCl in the reaction solution 2 2H 2 The concentration of O is 15g / L, and the magnetic stirring is uniform. At 130°C, quickly add 200ml of water (H 2 O), during the dropwise addition, the reaction solution was kept stirring at a high speed, and then reacted for 40min. The precipitated product was separated by centrifugation, then washed three times with methanol and once with deionized water, and finally dried at 100°C and annealed at 350°C for 4 hours to obtain flower-shaped nano-NiO with a grain size of 5-10nm and a BET ratio of Surface area is 72.64m 2 / g.

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Abstract

The invention discloses a preparation method of nano-nickel oxide for an electrode material of a supercapacitor, and the nano-nickel oxide prepared by the method. The preparation method comprises the following steps: mixing NiCl2.6H2O and a choline chloride-based deep eutectic solvent to obtain a solution I with the mass concentration being 10 to 30 g / L; and heating to 120 to 150 DEG C, mixing 100 to 300 parts of deionized water and 1,000 parts of the solution I, reacting for 0.5 to 2 hours, performing centrifugal separation to obtain precipitate, and washing, drying and calcining the precipitate to obtain the nano-nickel oxide. The preparation method is mild in condition, short in consumed time and suitable for large-scale industrialized production. The prepared flower-like nano NiO crystal grains have the grain sizes of being less than 10 nm, are distributed uniformly and are large in specific surface area, so the supercapacitor prepared by taking the nano NiO crystal grins as the electrode material has high reversible capacity and cycling performance, and the specific capacity of the supercapacitor is still stabilized to be close to 460 F / g after 3,000 times of charging / discharging circulation.

Description

technical field [0001] The invention relates to the field of preparation of nanomaterials, in particular to a method for preparing nano-nickel oxide used for supercapacitor electrode materials and the prepared nano-nickel oxide. Background technique [0002] Supercapacitor is an environmentally friendly, irreplaceable new energy storage and energy saving device between traditional capacitors and rechargeable batteries. It not only has the characteristics of fast charging and discharging of capacitors, but also has the energy storage mechanism of electrochemical batteries. Compared with traditional capacitors, supercapacitors have the characteristics of high power density, long cycle life, no pollution, and wide operating temperature range, so their applications in electric vehicles, communications, electronic signal monitoring and other fields have attracted more and more attention. [0003] The rapid development of new high-energy chemical power supply technology has put f...

Claims

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Application Information

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IPC IPC(8): C01G53/04B82Y30/00B82Y40/00
Inventor 谷长栋葛翔王秀丽涂江平
Owner ZHEJIANG UNIV
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