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a kind of nico 2 o 4 @mno 2 /foam nickel/mno 2 Preparation method of supercapacitor composite electrode material

A technology for supercapacitors and composite electrodes, applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as the theoretical cycle life gap of supercapacitors, achieve excellent cycle stability, improve stability Sex, the effect of promoting full contact

Active Publication Date: 2020-01-03
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although in recent years, researchers have made a lot of efforts to improve the cycle stability of supercapacitors, there is still a long way to go before the theoretical cycle life of supercapacitors (theoretically can be used infinitely).

Method used

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  • a kind of nico <sub>2</sub> o <sub>4</sub> @mno <sub>2</sub> /foam nickel/mno <sub>2</sub> Preparation method of supercapacitor composite electrode material
  • a kind of nico <sub>2</sub> o <sub>4</sub> @mno <sub>2</sub> /foam nickel/mno <sub>2</sub> Preparation method of supercapacitor composite electrode material
  • a kind of nico <sub>2</sub> o <sub>4</sub> @mno <sub>2</sub> /foam nickel/mno <sub>2</sub> Preparation method of supercapacitor composite electrode material

Examples

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Effect test

Embodiment 1

[0027] A kind of NiCo 2 o 4 @MnO 2 / Nickel Foam / MnO 2 The preparation method of supercapacitor composite electrode material comprises the following steps:

[0028] (1) Cut the nickel foam into a rectangle of 5 cm × 1 cm, ultrasonicate it with 2.5±0.5 M hydrochloric acid and deionized water for 15 min, and dry it in vacuum for later use;

[0029] (2) Weigh 0.75 mmol of Ni(NO 3 ) 2 ·6H 2 O, 1.5 mmol of Co(NO 3 ) 2 ·6H 2 O and 9 mmol of CO(NH 2 ) 2 ,spare;

[0030] (3) Put the drug weighed in step (2) into a 100 mL glass beaker, add 25 mL of absolute ethanol and 25 mL of deionized water, stir thoroughly with a magnetic stirrer for 5 min, and obtain a pink solution for later use ;

[0031] (4) Put the nickel foam in step (1) at an angle of 45° into a 60 mL polytetrafluoroethylene-lined reactor, then add the pink solution in step (3) into the reactor, seal it and place the reactor The temperature was raised to 100 °C in an incubator, reacted for 8 h, and cooled to roo...

Embodiment 2

[0034] A kind of NiCo 2 o 4 @MnO 2 / Nickel Foam / MnO 2 The preparation method of supercapacitor composite electrode material comprises the following steps:

[0035] (1) Cut the nickel foam into a rectangle of 5 cm × 1 cm, ultrasonicate it with 2.5±0.5 M hydrochloric acid and deionized water for 15 min, and dry it in vacuum for later use;

[0036] (2) Weigh 1.5 mmol of Ni(NO 3 ) 2 ·6H 2 O, 3.0 mmol of Co(NO 3 ) 2 ·6H 2 O and 18 mmol of CO(NH 2 ) 2 ,spare;

[0037] (3) Put the drug weighed in step (2) into a 100 mL glass beaker, add 25 mL of absolute ethanol and 25 mL of deionized water, stir thoroughly with a magnetic stirrer for 5 min, and obtain a pink solution for later use ;

[0038] (4) Put the nickel foam in step (1) at an angle of 45° into a 60 mL polytetrafluoroethylene-lined reactor, then add the pink solution in step (3) into the reactor, seal it and place the reactor The temperature was raised to 90 °C in an incubator, reacted for 10 h, and cooled to roo...

Embodiment 3

[0041] A kind of NiCo 2 o 4 @MnO 2 / Nickel Foam / MnO 2 The preparation method of supercapacitor composite electrode material comprises the following steps:

[0042] (1) Cut the nickel foam into a rectangle of 5 cm × 1 cm, ultrasonicate it with 2.5±0.5 M hydrochloric acid and deionized water for 15 min, and dry it in vacuum for later use;

[0043] (2) Weigh 0.75mmol of Ni(NO 3 ) 2 ·6H 2 O, 1.50 mmol of Co(NO 3 ) 2 ·6H 2 O and 9 mmol of CO(NH 2 ) 2 ,spare;

[0044] (3) Put the drug weighed in step (2) into a 100 mL glass beaker, add 25 mL of absolute ethanol and 25 mL of deionized water, stir thoroughly with a magnetic stirrer for 5 min, and obtain a pink solution for later use ;

[0045] (4) Put the nickel foam in step (1) at an angle of 45° into a 60 mL polytetrafluoroethylene-lined reactor, then add the pink solution in step (3) into the reactor, seal it and place the reactor The temperature was raised to 120 °C in an incubator, reacted for 8 h, and cooled to roo...

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Abstract

The invention relates to a method for preparing a NiCo2O4@MnO2 / nickel foam / MnO2 supercapacitor composite electrode material. The method comprises the steps of ultrasonically processing nickel foam with hydrochloric acid and deionized water, performing vacuum drying, adding Ni(NO3)2 6H2O, Co(NO3)2 6H2O, CO(NH2)2 to anhydrous ethanol and deionized water, and stirring to obtain a pink solution; andadding the nickel foam and the pink solution into a reaction vessel, performing washing, drying and heat treatment after the reaction to obtain NiCo2O4 / nickel foam, then placing the NiCo2O4 / nickel foam and a KMnO4 aqueous solution sequentially in a polytetrafluoroethylene-lined reaction kettle, washing the reacted nickel foam with anhydrous ethanol and deionized water, and performing drying to obtain a NiCo2O4@MnO2 / nickel foam / MnO2 composite electrode material. The ultra-thin MnO2 nanosheets covering the surface of NiCo2O4 nanowires and the surface of nickel foam can prevent the NiCo2O4 nanowires from falling off due to volume expansion and contraction during redox reaction, the structural stability is also maintained, the specific surface area of the active material is increased, and theelectrolyte is sufficiently contacted with the electrode material, so that the active material can be fully utilized.

Description

technical field [0001] The invention relates to the field of composite electrode materials for supercapacitors, in particular to a NiCo 2 o 4 @MnO 2 / Nickel Foam / MnO 2 A method for preparing a supercapacitor composite electrode material. Background technique [0002] As a new type of energy storage device that can be charged and discharged quickly, supercapacitors have attracted widespread attention because of their theoretically high energy density, power density and long cycle life. The electric double layer capacitance represented by carbon materials, because the theoretical capacitance (260 ~ 280 F g -1 ) is low, so the development is hindered; pseudocapacitors represented by transition metal oxides, because of their high theoretical capacitance, such as MnO 2 The theoretical capacitance is 1100 ~ 1300 F g -1 , the theoretical capacitance of NiO is as high as 3750 F g -1 , which has been deeply studied by many researchers. Binary transition metal oxide NiCo 2 o ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/30H01G11/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/26H01G11/30H01G11/46Y02E60/13
Inventor 郭春丽李杰张怀平侯利锋卫英慧
Owner TAIYUAN UNIV OF TECH