Method for synthesizing nanometer Ni2O3/Co3O4 cathode material on copper sheet current collector through two-step method

A technology of negative electrode material and current collector, applied in the field of synthesizing nanometer Ni2O3/Co3O4 negative electrode material, can solve the problems of poor cycle stability, affecting wide application, etc., and achieve the effect of improving mechanical strength, not easy to fall off, and improving the degree of bonding

Inactive Publication Date: 2014-08-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since Co 3 o 4 The inherent low electrical conductivity (with semiconductor properties) of electrode materials and the volume expansion caused by lithium deintercalation lead to obvious capacity fading during charge and discharge, especially the poor cycle stability at high rates, which affects its widely used

Method used

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  • Method for synthesizing nanometer Ni2O3/Co3O4 cathode material on copper sheet current collector through two-step method
  • Method for synthesizing nanometer Ni2O3/Co3O4 cathode material on copper sheet current collector through two-step method
  • Method for synthesizing nanometer Ni2O3/Co3O4 cathode material on copper sheet current collector through two-step method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Cut the polished pure copper sheet into a size of 1×3cm, and pretreat it under mixed acid (concentrated sulfuric acid, nitric acid, hydrochloric acid) for one minute. 250g / L nickel sulfate, 30g / L nickel chloride, 35g / L boric acid, 0.1g / L sodium lauryl sulfate are mixed and dissolved in distilled water as an electroplating solution. The magnetic stirring speed is 700r / min and the temperature is 45°C Under the constant current method, double electrodes are used for electroplating, and the current density is 0.75A / dm 3Next, the electroplating time is 10s, the treated copper sheet is used as the working electrode, and the pure nickel sheet is used as the counter electrode. After electroplating, it is washed several times and dried by nitrogen gas. Then dissolve 1.46g of cobalt nitrate, 0.37g of ammonium fluoride and 1.5g of urea in 50mL of distilled water, stir slowly for about 30 minutes, then transfer 35ml of the solution to the inner lining of the autoclave, and place th...

Embodiment 2

[0031] Cut the polished pure copper sheet into a size of 1×3cm, and pretreat it under mixed acid (concentrated sulfuric acid, nitric acid, hydrochloric acid) for one minute. 250g / L nickel sulfate, 30g / L nickel chloride, 35g / L boric acid, 0.1g / L sodium lauryl sulfate are mixed and dissolved in distilled water as an electroplating solution. The magnetic stirring speed is 700r / min and the temperature is 45°C Under the constant current method, double electrodes are used for electroplating, and the current density is 0.75A / dm 3 Next, the electroplating time is 10s, the treated copper sheet is used as the working electrode, and the pure nickel sheet is used as the counter electrode. After electroplating, it is washed several times and dried by nitrogen gas. Then dissolve 1.46g of cobalt nitrate, 0.37g of ammonium fluoride and 1.5g of urea in 50mL of distilled water, stir slowly for about 30 minutes, then transfer 35ml of the solution to the inner lining of the autoclave, and place t...

Embodiment 3

[0033] Cut the polished pure copper sheet into a size of 1×3cm, and pretreat it under mixed acid (concentrated sulfuric acid, nitric acid, hydrochloric acid) for one minute. 250g / L nickel sulfate, 30g / L nickel chloride, 35g / L boric acid, 0.1g / L sodium lauryl sulfate are mixed and dissolved in distilled water as an electroplating solution. The magnetic stirring speed is 700r / min and the temperature is 45°C Under the constant current method, double electrodes are used for electroplating, and the current density is 0.75A / dm 3 Next, the electroplating time is 10s, the treated copper sheet is used as the working electrode, and the pure nickel sheet is used as the counter electrode. After electroplating, it is washed several times and dried by nitrogen gas. Then dissolve 1.46g of cobalt nitrate, 0.37g of ammonium fluoride and 0.15g of urea in 50mL of distilled water, stir slowly for about 30 minutes, then transfer 35ml of the solution to the inner lining of the autoclave, and place ...

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Abstract

The invention discloses a method for synthesizing a nanometer Ni2O3 / Co3O4 cathode material on a copper sheet current collector through a two-step method. According to the method, a nanowire array directly grows on the current current collector matrix, so that the process treatment is greatly simplified, and an adhesive and a conductive additive are not used in the electrode. The method comprises the following steps: electroplating a nano-scale granular nickel layer on a copper matrix subjected to acid treatment to serve as a seed, generating a nano array through a hydrothermal reaction, and preparing a final product through high-temperature calcining. The proper nickel electroplating time is selected, the combination degree between the substrate and the material is improved, and the nickel is hard to drop, so that the cycling stability of the lithium ion battery is improved. Meanwhile, compared with a nickel plating-free pure Co3O4 array, the Ni2O3 / Co3O4 array has the advantages that the capacity value of unit area is improved. When the electrochemical performance is tested, the prepared cathode material reflects high charging and discharging capacity and long cycle life.

Description

technical field [0001] The invention relates to a two-step method for synthesizing nanometer Ni on a copper sheet current collector 2 o 3 / Co 3 o 4 The method for the negative electrode material particularly relates to a method for preparing the negative electrode material for the lithium-ion battery through electroplating and hydrothermal two-step synthesis. Background technique [0002] With the development of economy and society, fossil energy such as petroleum and coal is decreasing day by day, and energy security has become a major issue for human survival and development. The development of new green and renewable energy is an effective way to solve the problem of energy shortage. In recent years, with the technical upgrading of various small and medium-sized portable electronic products, and the development and commercial promotion of a new generation of electric vehicles / hybrid vehicles, higher requirements are placed on the energy density and performance of batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/66B82Y40/00
CPCY02E60/122B82Y40/00H01M4/0416H01M4/1391H01M4/362H01M4/523H01M4/661H01M10/0525Y02E60/10
Inventor 陈仕谋刘小雨张文龙张锁江张军玲郝文君宋玉婷
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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