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Isomorphous, high performance cobalt nickel @ cobalt nickel core-shell structure material and preparation method and application thereof

A core-shell structure, nickel cobalt oxide technology, applied in nanotechnology for materials and surface science, hybrid/electric double-layer capacitor manufacturing, nanotechnology, etc. Problems such as poor capacitance and cycle stability, poor rate performance, etc., achieve the effects of easy regulation, mild conditions, and convenient post-processing

Inactive Publication Date: 2017-10-24
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NiCo 2 o 4 Due to its excellent electrical conductivity and high mass specific capacity, it has become an electrode material widely studied at present. The nanostructure can provide a high specific surface area. At present, the nanostructure based on this material is mainly NiCo 2 o 4 Nanowire or NiCo 2 o 4 Nanosheets, but generally a single structure has defects such as small specific capacitance, poor rate performance, and unstable cycle. For example, Ramesh J. Deokate et al reported a single NiCo in the journal Electrochimica Acta 2 o 4 is only 752F / g, so it is critical to seek composite materials with different structures
[0004] In recent years, although a series of composite materials have been obtained in this field, they still have certain defects, such as: Kaibing Xu et al reported NiCo in the Journal of Alloys and Compounds 2 o 4 @MnO 2 Composite materials, but their specific capacitance and cycle stability are not good; Liang Huang et al reported in the journal Scientific RepoRts that NiCo 2 o 4 @NiMoO 4 Electrochemical properties of nanowire electrode materials are also poor

Method used

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  • Isomorphous, high performance cobalt nickel @ cobalt nickel core-shell structure material and preparation method and application thereof
  • Isomorphous, high performance cobalt nickel @ cobalt nickel core-shell structure material and preparation method and application thereof
  • Isomorphous, high performance cobalt nickel @ cobalt nickel core-shell structure material and preparation method and application thereof

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preparation example Construction

[0027] The invention provides a method for preparing isomorphic, high-performance nickel cobalt oxide@nickel cobalt oxide core-shell structure material, including:

[0028] 1) nickel foam is carried out pretreatment;

[0029] 2) Mix nickel salt, cobalt salt, urea, and solvent to prepare solution A, then place solution A under airtight conditions for hydrothermal reaction, then separate solid from liquid and wash and dry the separated solid to prepare Foamed nickel covering the precursor;

[0030] 3) Mix nickel salt, cobalt salt, hexamethylenetetramine (MHT), and solvent to prepare solution B, then place the foamed nickel covering the precursor and solution B under airtight conditions for hydrothermal reaction, and then Solid-liquid separation and the separated solids are washed, dried, and calcined to obtain isomorphic, high-performance NiCo 2 o 4 @NiCo 2 o 4 Core-shell structural material.

[0031] In step 1) of the present invention, the specific operation of pretreatm...

Embodiment 1

[0054] 1) Soak foamed nickel (2cm in length, 3cm in width, 0.8mm in thickness, and 0.254g in weight) in 3mol / L hydrochloric acid solution at 20°C for 15 minutes, and ultrasonically clean it for 14 minutes to obtain foamed nickel after cleaning.

[0055] 2) 0.925mmol Ni(NO 3 ) 2 ·6H 2 O, 1.85mmol Co(NO 3 ) 2 ·6H 2 O and 3.7mmol urea were dissolved in 15mL deionized water and 3mL ethanol, and stirred for 8min to obtain solution A. Transfer solution A to a 50mL reaction kettle, put the cleaned foamed nickel into solution A, and seal it under water at 120°C. After thermal reaction for 4 h, cooling to 25 °C, the nickel foam covering the sample was taken out, washed twice with deionized water and ethanol, and then dried at 60 °C for 8 h to obtain the nickel foam covering the precursor.

[0056] 3) Add 0.8mmol Ni(NO 3 ) 2 ·6H 2 O, 1.8mmol Co(NO 3 ) 2 ·6H 2 O and 5.2mmol MHT were dissolved in 15mL deionized water and 8mL ethanol, stirred for 10min to obtain solution B, solu...

Embodiment 2

[0058] 1) Soak foamed nickel (1.8cm in length, 2.9cm in width, 0.5mm in thickness, and 0.205g in weight) in 3mol / L, 10°C hydrochloric acid solution for 10 minutes, and ultrasonically clean it for 13 minutes to obtain foamed nickel after cleaning .

[0059] 2) Add 1mmol Ni(NO 3 ) 2 ·6H 2 O, 2mmol Co(NO 3 ) 2 ·6H 2 O and 4mmol urea were dissolved in 20mL deionized water and 5mL ethanol, and stirred for 10min to obtain solution A. Transfer solution A to a 50mL reaction kettle, put the cleaned foamed nickel into solution A, and seal it under 120°C for hydrothermal React for 5 hours, cool to 25°C, take out the nickel foam covering the sample, wash twice with deionized water and ethanol, and then dry at 60°C for 12 hours to obtain the nickel foam covering the precursor.

[0060] 3) Add 1mmol Ni(NO 3 ) 2 ·6H 2 O, 2mmol Co(NO 3 ) 2 ·6H 2 O and 5.5mmol MHT were dissolved in 20mL deionized water and 10mL ethanol, stirred for 15min to obtain solution B, solution B was transfe...

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Abstract

The invention discloses an isomorphous, high performance cobalt nickel @ cobalt nickel core-shell structure material and a preparation method and application thereof. The preparation method of the isomorphous, high performance cobalt nickel @ cobalt nickel core-shell structure material comprises the following steps: 1) pre-treating the foam nickel; 2) mixing the nickel salt, cobalt salt, urea and solvent to prepare a solution A, then placing the solution A in an airtight condition to carry out hydrothermal reaction, and then separating the solid and the liquid and performing washing and drying on the separated solid to prepare the foam nickel covered with precursor; 3) mixing the nickel salt, cobalt salt, six methylene four amine (MHT) and the solvent to prepare a solution B, then placing the foam nickel covered with precursor and the solution B in an airtight condition to carry out hydrothermal reaction, and then separating the solid and the liquid and performing washing, drying and calcining to obtain the isomorphous and high performance NiCo2O4 @ NiCo2O4 core-shell structure material. The cobalt nickel @ cobalt nickel core-shell structure material prepared through the method has excellent electrochemical performances.

Description

technical field [0001] The present invention relates to a core-shell structure material, in particular to an isomorphic, high-performance nickel cobaltate@cobaltate nickel core-shell structure material and its preparation method and application. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, play an important role in supplementing lithium-ion batteries for energy storage due to their high power density, fast ion exchange rate, and long cycle life. [0003] The performance of electrochemical capacitors depends largely on its electrode materials, and has a crucial relationship with the composition and structure of electrode materials. The current electrode materials are mainly transition metal materials, such as transition metal oxides and sulfides, mixed transition metal oxides and conductive polymers. NiCo 2 o 4 Due to its excellent electrical conductivity and high mass specific capacity, it has become an electrode material widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/46B82Y30/00
CPCY02E60/13H01G11/86B82Y30/00H01G11/24H01G11/46
Inventor 王秀华方瑶谢慧芳杨真珍
Owner ANHUI NORMAL UNIV
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