Nanometer nickel cobalt oxide and preparation method thereof

A nano-cobalt, nickel acid technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., to achieve the effect of reducing cost and improving electrochemical performance

Active Publication Date: 2015-01-07
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation of two-dimensional coral-like nano

Method used

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  • Nanometer nickel cobalt oxide and preparation method thereof
  • Nanometer nickel cobalt oxide and preparation method thereof
  • Nanometer nickel cobalt oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Implementation Example 1:

[0027] The first step: ultrasonically dispersing 60 mg of graphite oxide in deionized water for 120 min to obtain a graphene oxide solution;

[0028] In the second step, 0.291g of nickel nitrate and 0.582g of cobalt nitrate were dissolved in 30mL of water and stirred for 60 minutes;

[0029] In the third step, the systems obtained in the first two steps were mixed and stirred for 60 minutes;

[0030] The fourth step, the reaction system of the third step is freeze-dried;

[0031] In the fifth step, the powder obtained after the freeze-drying in the fourth step is heat-treated at 400° C. for 1 hour in a nitrogen atmosphere to obtain two-dimensional coral-shaped nano-nickel cobaltate.

Example Embodiment

[0032] Implementation Example 2:

[0033] The first step: ultrasonically dispersing 20 mg of graphite oxide in deionized water for 30 min to obtain a graphene oxide solution;

[0034] In the second step, 0.291g of nickel nitrate and 0.582g of cobalt nitrate were dissolved in 30mL of water and stirred for 20 minutes;

[0035] In the third step, the systems obtained in the first two steps were mixed and stirred for 30 minutes;

[0036] The fourth step, the reaction system of the third step is freeze-dried;

[0037] In the fifth step, the powder obtained after freeze-drying in the fourth step is heat-treated at 200° C. for 5 hours under a nitrogen atmosphere to obtain two-dimensional coral-shaped nano-nickel cobaltate.

Example Embodiment

[0038] Implementation example 3:

[0039] The first step: ultrasonically dispersing 30 mg of graphite oxide in deionized water for 60 min to obtain a graphene oxide solution;

[0040] In the second step, 0.291g of nickel nitrate and 0.582g of cobalt nitrate were dissolved in 30mL of water and stirred for 30 minutes;

[0041] In the third step, the systems obtained in the first two steps were mixed and stirred for 60 minutes;

[0042] The fourth step, the reaction system of the third step is freeze-dried;

[0043] In the fifth step, the powder obtained after freeze-drying in the fourth step is heat-treated at 300 °C for 2 hours in a nitrogen atmosphere to obtain two-dimensional coral-shaped nano-nickel cobalt oxide. The field emission scanning electron microscope is as follows: figure 2 shown. The prepared two-dimensional coral-like nano-nickel cobalt oxide was used as a negative electrode material for lithium ion batteries to conduct electrochemical performance tests. The ...

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Abstract

The invention discloses two-dimensional coral nanometer nickel cobalt oxide and a preparation method thereof. The preparation method comprises the following steps: putting oxidized grapheme in water, carrying out ultrasonic dispersion, adding cobalt nitrate and nickel nitrate into water, stirring, dissolving, mixing the cobalt nitrate and the nickel nitrate uniformly so as to obtain a mixed system, freezing the mixed system, drying to obtain dried powder, and carrying out heat treatment on the dried powder to obtain the two-dimensional coral nanometer nickel cobalt oxide. Oxidized grapheme is used as a template material and a heat treatment method is adopted for preparing the two-dimensional coral nanometer nickel cobalt oxide. The prepared two-dimensional coral nanometer nickel cobalt oxide used as a lithium ion battery negative material has the good application prospect and the good economic benefit.

Description

technical field [0001] The invention relates to a nano-nickel cobaltate and a preparation method thereof, in particular to a two-dimensional coral-like nano-nickel cobaltate and a preparation method thereof, belonging to the field of nanomaterial preparation. Background technique [0002] As a new generation of green high-energy rechargeable batteries, lithium-ion batteries are widely used in electrical equipment such as mobile phones, notebook computers, and small cameras due to their outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. At the same time, it also shows good application prospects and potential economic benefits in the fields of electric vehicles, satellites, aerospace, and space military. At present, it has become one of the high-tech industries of great significance to the national economy and people's life in this century. The performance of lithium-ion batteries (such as capa...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/64H01M4/1391
CPCH01M4/1391H01M4/525H01M4/64H01M2004/027Y02E60/10
Inventor 付永胜彭长青曾晚婷庄家伟王佳瑜汪信朱俊武
Owner NANJING UNIV OF SCI & TECH
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