Method for preparing boron-doped porous carbon spheres

A technology of boron doping and porous carbon, which is applied in the synthesis field of boron doped porous carbon spheres, can solve the problems of high cost, low boron doping amount, difficult large-scale production, etc., and achieve the effect of simple process

Inactive Publication Date: 2017-11-14
卢云峰
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The preparation method of boron-doped porous carbon spheres provided by the present invention is to solve the problems of high cost, low boron doping amount and difficulty in large-scale production existing in the current technology of boron-doped carbon materials. The porogen is a boron source, carbon source and pore template through the self-assembly process assisted by the spray drying process to obtain boron-doped porous carbon spheres

Method used

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  • Method for preparing boron-doped porous carbon spheres
  • Method for preparing boron-doped porous carbon spheres
  • Method for preparing boron-doped porous carbon spheres

Examples

Experimental program
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Effect test

Embodiment 1

[0045]The preparation method of boron-doped porous carbon spheres in this example is realized according to the following steps: Weigh 1.8g of glucose and 1.24g of boric acid dissolved in 15mL of deionized water and stir until completely dissolved, then add 4.2g of tetraethylorthosilicate ethyl ester, 2mL 0.1mol / L hydrochloric acid, 15mL ethanol and stirred for 1h to form a precursor solution, and then the precursor solution was carried by nitrogen into an aerosol-assisted spray drying device at a temperature of 450°C, and the nitrogen flow rate was controlled to be 500mL / min, and the obtained solid product Use a tube furnace to raise the temperature to 900°C at a rate of 8°C / min in nitrogen and keep it warm for 3 hours. The carbonized product obtained is washed with 10% hydrofluoric acid and deionized water for 3 times, and then dried at 80°C for 10 hours. , to obtain boron-doped porous carbon spheres in this embodiment.

Embodiment 2

[0049] Weigh 1.8g of sucrose and 1.8g of boric acid dissolved in 15mL of deionized water and stir until completely dissolved, then add 4.2g of tetraethylorthosilicate, 2mL of 0.1mol / L hydrochloric acid, 15mL of ethanol and stir for 1h to form a precursor solution. Then the precursor solution is carried by nitrogen into the aerosol-assisted spray drying device with a temperature of 450 °C, and the nitrogen flow rate is controlled to be 500 mL / min. The obtained solid product is heated in a tube furnace at a rate of 8 °C / min in nitrogen. Temperature was maintained at 900° C. for 3 hours, and the obtained carbonized product was centrifuged and washed three times with 10% hydrofluoric acid and deionized water, and then dried at 80° C. for 10 hours to obtain boron-doped porous carbon spheres in this example. XPS analysis showed that the boron content of the boron-doped porous carbon sphere was 4.5%.

Embodiment 3

[0051] Weigh 1.8g of soluble starch and 1.24g of boric acid dissolved in 15mL of deionized water and stir until completely dissolved, then add 4.2g of tetraethylorthosilicate ethyl ester, 2mL of 0.1mol / L hydrochloric acid, 15mL of ethanol and stir for 1h to form a precursor solution , and then the precursor solution is carried by nitrogen into the aerosol-assisted spray drying device with a temperature of 450°C, and the nitrogen flow rate is controlled to be 500mL / min. The obtained solid product is heated in a tube furnace at a rate of 8°C / min in nitrogen The temperature was raised to 900° C. and kept for 3 hours. The obtained carbonized product was centrifuged and washed three times with 10% hydrofluoric acid and deionized water, and then dried at 80° C. for 10 hours to obtain the boron-doped porous carbon spheres in this example. XPS analysis showed that the boron content of the boron-doped porous carbon sphere was 3.2%.

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Abstract

The invention relates to a method for preparing boron-doped porous carbon spheres. The method comprises the following steps: 1) dissolving a saccharide carbon source and boric acid in water, and carrying out mixing and stirring by a certain ratio, so as to obtain a transparent solution; 2) adding a silicon-based pore former so as to form a boron-doped porous carbon sphere precursor solution; 3) subjecting the obtained precursor solution to a (aerosol assisted) spray drying process, so as to obtain solid-state boron-doped carbon sphere precursor particles; 4) subjecting the obtained solid particles to pyrolysis in an inert atmosphere, so as to obtain a mixture, of which a pore template SiO2 is embedded in boron-doped carbon spheres; 5) removing the silicon-based pore former from the mixture, and carrying out drying, thereby obtaining the boron-doped porous carbon spheres. According to the method, the problems of the existing boron-doped carbon material technologies that the raw material cost is high, the preparation process is miscellaneous, the boron doped amount is low, and large-scale industrial production is difficult are solved, and an alternate material, which is superior to commercial graphite, of negative poles of lithium-ion batteries is provided.

Description

technical field [0001] The invention relates to a preparation method of a boron-doped carbon material, in particular to a synthesis method of a boron-doped porous carbon sphere. Background technique [0002] Among various electrochemical energy storage devices or equipment, lithium-ion batteries have been widely used in the fields of mobile phones and electric vehicles due to their high energy density and long cycle life. Ion batteries require higher rate performance and cycle stability, especially for negative electrode materials. The current commercial anode material is graphite, which has a lower theoretical capacity (372mAh g -1 ) and rate performance are the key to the current lithium-ion battery performance. Therefore, researchers at home and abroad have proposed various negative electrode alternative materials with high lithium ion storage capacity, such as Sn, SnO 2 , Si, ZnO and various transition metal oxides. However, the above-mentioned materials have problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/364H01M4/587H01M10/0525H01M4/36C01B32/15C01B32/00Y02E60/10C01B32/05H01M2004/021C01P2002/54C01P2006/40C01B32/342C01P2002/82C01P2004/03C01P2004/04C01P2004/34H01M2004/027C01B32/318
Inventor 张雨虹
Owner 卢云峰
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