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Nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and preparation method thereof

A technology of nitrogen-doped porous carbon and nanocomposite materials, applied in battery electrodes, electrochemical generators, electrical components, etc., to achieve good conductivity, prevent agglomeration, and increase the effect of contact area

Inactive Publication Date: 2015-10-07
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the combination of nitrogen-doped carbonaceous substrate materials and nanostructured metal oxides has attractive prospects in the field of lithium-ion battery research, the use of biomass materials as carbon and nitrogen source precursors requires strong operability and preparation conditions. There are few reports on the preparation of nanocomposite anode materials by loading nanometer-sized metal oxides onto nitrogen-doped porous carbon spheres by a mild method

Method used

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  • Nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and preparation method thereof
  • Nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and preparation method thereof
  • Nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and preparation method thereof

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Effect test

Embodiment 1

[0033] Mix 0.32g of cetyltrimethylammonium bromide, 2ml of tetraethyl orthosilicate and 2ml of ammonia (NH 3The mass percentage is 25~28%) was added to 106ml of deionized water and 56ml of absolute ethanol mixed solvent and stirred for 8h; at the same time, carboxymethyl chitosan was dissolved in deionized water to form 100ml of a solution with a mass percentage of 5%. The above solution was mixed and stirred for 20 hours; then the solvent of the mixed solution was evaporated and put into a drying oven at 100°C for solidification treatment for 24 hours. After the solid material was ground, it was carbonized under the protection of high-purity nitrogen. The carbonization temperature was 800°C and the carbonization time was 4h, the heating rate is 5°C / min; the carbonized product is fully stirred at room temperature for 20h with 5% hydrofluoric acid solution by mass percent, then washed with deionized water for 3 times, and dried at 80°C to obtain nitrogen-doped porous carbon bal...

Embodiment 2

[0037] Mix 0.36g cetyltrimethylammonium bromide, 3ml tetraethyl orthosilicate and 3ml ammonia water (NH 3 content of 25~28%) was added to 116ml of deionized water and 60ml of anhydrous ethanol mixed solvent and stirred for 6h; at the same time, carboxylated chitosan was dissolved in deionized water to form 100ml of a solution with a mass percentage of 6%, and then mixed with the above solution Mix and stir for 18 hours; then evaporate the solvent of the mixed solution and put it into a drying oven at 100°C for solidification treatment for 20 hours. After the solid material is ground, it is carbonized under the protection of high-purity nitrogen. The carbonization temperature is 700°C and the carbonization time is 2 hours. The heating rate was 10°C / min; the carbonized product was fully stirred at room temperature for 18 hours with a 10% by mass hydrofluoric acid solution, washed three times with deionized water, and dried at 80°C to obtain nitrogen-doped porous carbon spheres. ...

Embodiment 3

[0041] Mix 0.32g of cetyltrimethylammonium bromide, 2ml of tetraethyl orthosilicate and 2ml of ammonia (NH 3 content of 25~28%) was added to 106ml of deionized water and 56ml of anhydrous ethanol mixed solvent and stirred for 8 hours; at the same time, 300,000 molecular weight chitosan was dissolved in acetic acid aqueous solution with a volume concentration of 2% to form 80ml with a mass percentage of 4 % solution and mixed with the above solution for 24 hours; then the solvent of the mixed solution was evaporated and placed in a drying oven at 120°C for solidification treatment for 20 hours. ℃, the carbonization time is 3h, and the heating rate is 5°C / min; the carbonized product is fully stirred at room temperature for 20h with an 8% hydrofluoric acid solution by mass percent, washed three times with deionized water, and dried at 100°C to obtain Nitrogen-doped porous carbon spheres.

[0042] Weigh 80 mg of nitrogen-doped porous carbon spheres and add them to 100 ml of absol...

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Abstract

The invention discloses a nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and a preparation method thereof and belongs to the fields of electrochemistry and new energy resource materials. According to the nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on the chitosan and the derivatives thereof and the preparation method thereof, firstly the chitosan and the derivatives thereof are taken as carbon source and nitrogen source precursors, a hard template carbonization method is adopted to prepare nitrogen-doped porous carbon spheres; then a mild hydrothermal method is adopted to load cobaltous oxide nano particles to the nitrogen-doped porous carbon spheres, and then the nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite material is obtained. The material synthesizes the structural features of the nitrogen-doped porous carbon spheres and the small-size effect advantages of the cobaltous oxide nano particles, and due to the expression of the synergistic effect of the nitrogen-doped porous carbon spheres and the cobaltous oxide nano particles, the prepared material shows higher reversible specific capacity, better cycling stability and more excellent large rate discharge performance than a commercial graphite material when used as a lithium ion battery anode material. The method is strong in operability, preparation conditions are mild, the requirement for equipment is not rigorous, and the preparation method is suitable for industrial production; the nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite material prepared by the method has potential application value in electrochemistry fields including lithium ion batteries, supercapacitors and the like.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped porous carbon sphere-cobalt oxide nanocomposite material based on chitosan and its derivatives, and belongs to the field of electrochemical and new energy materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products such as mobile phones and notebook computers due to their advantages such as high working voltage, high energy density, long cycle life, and no memory effect. Lithium-ion batteries are also expected to be widely used in large-scale power supply fields such as pure electric vehicles (EV), hybrid electric vehicles (HEV) and aerospace. However, due to the disadvantages of low theoretical specific capacity (only 372mAh / g) and poor safety of high-rate charging and discharging, the graphite carbon materials currently used commercially in lithium-ion batteries cannot meet the growing demand for high-efficiency energy storage in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/362H01M4/52H01M10/0525Y02E60/10
Inventor 郭连贵覃彩芹李伟丁瑜王锋周甜
Owner HUBEI ENG UNIV
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