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Preparation method of cobaltosic oxide-carbon porous nanofiber and application of cobaltosic oxide-carbon porous nanofiber to preparation of lithium ion battery

A technology of tricobalt tetroxide and nanofibers, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of low cycle life and poor rate performance, achieve good reproducibility, improve cycle life and rate performance, and be easy to implement Effect

Inactive Publication Date: 2015-03-25
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of low cycle life and poor rate performance of the existing cobalt tetroxide as the negative electrode material of lithium ion batteries, the present invention provides a preparation method of cobalt tetroxide-carbon porous nanofibers, the diameter of the obtained nanocomposite material is nanometer level, which can improve Its cycle life; using porous carbon nanofibers as the conductive matrix of cobalt tetroxide can increase the conductivity of cobalt tetroxide, thereby improving its rate performance

Method used

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  • Preparation method of cobaltosic oxide-carbon porous nanofiber and application of cobaltosic oxide-carbon porous nanofiber to preparation of lithium ion battery
  • Preparation method of cobaltosic oxide-carbon porous nanofiber and application of cobaltosic oxide-carbon porous nanofiber to preparation of lithium ion battery
  • Preparation method of cobaltosic oxide-carbon porous nanofiber and application of cobaltosic oxide-carbon porous nanofiber to preparation of lithium ion battery

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Embodiment 1

[0021] (1) Preparation of polymer / inorganic spinning solution: Add 1g of polyacrylonitrile and 1g of polymethyl methacrylate to 19ml of dimethylformamide (dimethylformamide, density 0.945g / ml) , heated at 90°C and continuously stirred until completely dissolved to obtain a polymer dimethylformamide solution; 0.6g of cobalt acetylacetonate was added to 3.6ml of dimethylformamide and continuously stirred until dissolved to obtain an inorganic sol solution Add the inorganic sol solution dropwise to the polymer solution, and continue stirring at 80-100°C for 24 hours to obtain a polymer / inorganic composite spinning solution.

[0022] (2) Preparation of polymer / inorganic composite nanofibers loaded on aluminum foil: fix the aluminum foil to a plastic plate as a collection device, prepare polymer / inorganic composite nanofibers loaded on aluminum foil by electrospinning process, and control composite nanofibers The thickness of the fiber is 0.1-0.5mm.

[0023] (3) Preparation of tri...

Embodiment 2

[0025] (1) Preparation of polymer / inorganic spinning solution: Add 1g of polyacrylonitrile and 1g of polymethyl methacrylate to 23ml of dimethylformamide, heat at 90°C and keep stirring until completely dissolved to obtain a polymer Add 0.6g of cobalt acetate to 2.9ml of dimethylformamide, stir continuously until dissolved to obtain inorganic sol solution; add the inorganic sol solution dropwise into the polymer solution, and continue stirring at 80-100°C After 24 hours, a polymer / inorganic composite spinning solution was obtained.

[0026] Other steps are the same as in Example 1, and the diameter of the obtained composite fiber is about 90nm.

Embodiment 3

[0028] (1) Preparation of polymer / inorganic spinning solution: 1g of polyacrylonitrile and 1g of polymethyl methacrylate were added to 15.5ml of dimethylformamide, heated at 90°C and continuously stirred until completely dissolved to obtain Polymer dimethylformamide solution; add 0.6g cobalt chloride to 2.2ml dimethylformamide, stir continuously until dissolved to obtain inorganic sol; add the inorganic sol dropwise to the polymer solution, Continue stirring at 80-100°C for 24 hours to obtain a polymer / inorganic composite spinning solution.

[0029] The other steps are the same as in Example 1, and the diameter of the obtained composite fiber is about 95nm.

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Abstract

The invention discloses a preparation method of a cobaltosic oxide-carbon porous nanofiber and application of the cobaltosic oxide-carbon porous nanofiber to preparation of a lithium ion battery. The preparation method comprises the steps of dropwise adding a sol solution of soluble cobalt salt into a dimethylformamide solution of polyacrylonitrile and polymethyl methacrylate, continuously stirring, and keeping at the temperature of 80-100 DEG C for 24 hours; preparing a polymer / cobalt salt composite fiber supported on aluminum foil by using an electrostatic spinning process; heating the polymer / cobalt salt composite fiber to 280 DEG C at the rate of 2-4 DEG C / min in air, and keeping heating for 2 hours; and then, heating to 500 DEG C in the presence of inert atmosphere, keeping heating for 4 hours, and then, cooling to obtain the cobaltosic oxide-carbon porous nanofiber. The composite material has nano-scale size and high conductivity; when the cobaltosic oxide-carbon porous nanofiber is used as a negative electrode material of a lithium battery, the cycle life of the lithium battery can be prolonged, and the rate capability of the lithium battery can be improved; in addition, the preparation method is simple in process, good in repeatability, easy to implement and beneficial to industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, in particular to a preparation method of lithium-ion battery tricobalt tetroxide-carbon porous nanofibers. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high capacity, small size, light weight, no memory effect, small self-discharge and long cycle life, making them a new chemical power source with great potential in the 21st century. At present, the theoretical capacity of the negative electrode material graphite in commercial lithium batteries is only 372mAh / g, which cannot meet the application requirements of high-performance batteries. Therefore, the development of anode materials with higher capacity, long cycle life and high rate performance has become the goal pursued by researchers at home and abroad. Among them, the transition metal oxide tricobalt tetroxide (Co 3 o 4 ) The theoretical capacity (890mAh / ...

Claims

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Application Information

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IPC IPC(8): H01M4/52B82Y30/00B82Y40/00H01M10/0525
CPCB82Y30/00B82Y40/00H01M4/52H01M4/625H01M10/0525Y02E60/10
Inventor 杨宏训聂建行
Owner JIANGSU UNIV OF SCI & TECH
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