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Ni-Co double metal hydroxide nanometer sheet / N-doped carbon fiber hybrid material and preparation method thereof

A nitrogen-doped carbon fiber and hydroxide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problem of electrode rate stability and cycle stability discount, metal hydroxide agglomeration, and structural instability , Unfavorable large-scale commercial application and other issues, to achieve the effect of good repeatable material preparation performance, improved electrochemical energy storage performance, and low price

Inactive Publication Date: 2016-04-20
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of people's demand for energy storage performance of energy storage devices, these single-component materials often cannot meet the demand well, so it is imperative to develop the next generation of hybrid electrode materials with multiple functions.
[0003] Nickel-cobalt double metal hydroxide is a typical pseudocapacitive material, which has a very good specific capacity, but because the metal hydroxide is prone to agglomeration and unstable structure during cycling, the rate stability and The cycle stability is greatly reduced, which is not conducive to large-scale commercial applications

Method used

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  • Ni-Co double metal hydroxide nanometer sheet / N-doped carbon fiber hybrid material and preparation method thereof
  • Ni-Co double metal hydroxide nanometer sheet / N-doped carbon fiber hybrid material and preparation method thereof
  • Ni-Co double metal hydroxide nanometer sheet / N-doped carbon fiber hybrid material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Example 1, This embodiment includes the following steps:

[0026] (1) Preparation of nitrogen-doped precursor polyaniline-coated bacterial cellulose can be prepared by using existing technology (such as patent CN102212210A), and the prepared polyaniline-coated bacterial cellulose is denoted as BC / PANI;

[0027] (2) Put the polyaniline-coated bacterial fibers prepared in step (1) into a tube furnace for high-temperature carbonization, which can be prepared by using existing technologies (such as patent CN201510442267.0) to obtain nitrogen-doped carbon fibers, denoted as CBC-N;

[0028] (3) Weigh 20mg of nitrogen-doped carbon fiber, 20mg of nickel nitrate, 40mg of cobalt nitrate and 100mg of hexamethylenetetramine, put them into 30ml of deionized water / ethanol mixed solvent (1:1 volume ratio), stir to dissolve ;

[0029] (4) Transfer the dispersion containing nitrogen-doped carbon fiber, nickel salt, cobalt salt and hexamethylenetetramine prepared in step (3) to a fla...

Embodiment 2

[0030] Example 2, Change the mass of nickel nitrate in Example 1 to 100 mg, the mass of cobalt nitrate to 200 mg, and the mass of hexamethylenetetramine to 500 mg, and the rest are the same as in Example 1. The hybrid material finally obtained is denoted as CBC-NLDH -0.4, the material is at a scan rate of 5mVs-1 The case specific capacity is 1335.9Fg -1 .

Embodiment 3

[0031] Example 3, Change the mass of nickel nitrate in Example 1 to 180 mg, the mass of cobalt nitrate to 360 mg, and the mass of hexamethylenetetramine to 900 mg, and the rest are the same as in Example 1. The hybrid material obtained at last is recorded as CBC-NLDH -0.7, the material is at a scan rate of 5mVs -1 The case specific capacity is 826.3Fg -1 .

[0032] In the electrochemical test, a three-electrode test system was adopted, the glassy carbon electrode modified by the prepared hybrid material was used as the working electrode, the saturated calomel electrode was used as the reference electrode, the platinum wire was used as the counter electrode, and the electrolyte used was 6M KOH solution. The electrochemical energy storage performance of the nickel-cobalt double metal hydroxide nanosheet / nitrogen-doped carbon fiber hybrid material prepared in the present invention was studied by linear sweep voltammetry and constant current charge-discharge curve.

[0033] T...

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Abstract

The invention belongs to the energy storage material technical field, concretely a Ni-Co double metal hydroxide nanometer sheet / N-doped carbon fiber hybrid material and a preparation method thereof. The hybrid material employs nickel salt, cobalt salt and hexamine as a precursor, and is obtained by in situ growing a Ni-Co double metal hydroxide nanometer sheet on the surface of an N-doped carbon fiber with a three-dimensional network structure. The preparation method comprises: preparing an N-doped carbon fiber through in situ oxidation reduction reaction, freeze drying and high temperature carbonization; and in situ growing a Ni-Co double metal hydroxide nanometer sheet on the surface of an N-doped carbon fiber in a solution deposition method. The prepared N-doped carbon fiber greatly increases the electrochemical active sites of a material, improves the electrochemical activity of the material, provides a good template for the efficient deposition of a Ni-Co double metal hydroxide nanometer sheet, and greatly widens the application scope of the material. The hybrid material can be used in the supercapacitor filed as an ideal high-performance energy storage material.

Description

technical field [0001] The invention belongs to the technical field of new energy storage materials, and in particular relates to a nickel-cobalt double metal hydroxide nanosheet / nitrogen-doped carbon fiber hybrid material and a preparation method thereof. Background technique [0002] Supercapacitors are a new class of energy storage devices that have been widely studied at present, and they have outstanding advantages such as fast charge and discharge and long cycle life. According to different energy storage mechanisms, supercapacitors can be mainly divided into two categories: electric double layer supercapacitors and pseudocapacitive supercapacitors. The former mainly uses carbon materials as electrode materials, while the latter mostly uses metal oxides / hydroxides / conductive Polymers are electrode materials. However, with the continuous improvement of people's demand for energy storage performance of energy storage devices, these single-component materials often canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/40H01G11/86
CPCY02E60/13H01G11/24H01G11/30H01G11/40H01G11/86
Inventor 刘天西赖飞立缪月娥张由芳左立增鲁恒毅
Owner FUDAN UNIV
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