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Preparation method of hollow bowl-shaped carbon-based metal/selenium/oxygen co-doped composite material and lithium ion battery

A composite material and metal-based technology, which is applied in the preparation of hollow bowl-shaped carbon-based metal/selenium/oxygen co-doped composite materials, can solve the problems of high purchase price, environmental pollution, narrow application, etc., and achieve process repeatability High, simple synthesis process, easy to control the effect

Active Publication Date: 2021-03-26
GUANGDONG UNIV OF TECH
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Problems solved by technology

Finally, the precipitate is calcined in an inert gas atmosphere to obtain a bowl-shaped carbon metal oxide composite material; the thickness of the carbon layer of the composite material prepared by this method is inconvenient to adjust, and the pore size on the carbon layer cannot be adjusted, and polystyrene hollow particles are relatively difficult to prepare , the purchase price is more expensive
Another example is to treat the prepared carbon hollow structure with acid or alkali to adjust the pH to obtain a bowl-shaped hollow structure; this method is narrow in application, and its shape remains unstable. Strong acid and strong alkali pollute the environment, which is not friendly to environmental problems.

Method used

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  • Preparation method of hollow bowl-shaped carbon-based metal/selenium/oxygen co-doped composite material and lithium ion battery
  • Preparation method of hollow bowl-shaped carbon-based metal/selenium/oxygen co-doped composite material and lithium ion battery

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preparation example Construction

[0026] In view of the problems in the prior art that the hollow bowl-shaped carbon-based metal / selenium / oxygen co-doped composite material is difficult to prepare, the morphology is unstable, and the preparation process is not friendly to the environment, the application provides a hollow bowl-shaped carbon-based metal / selenium / oxygen co-doped composite material. A method for preparing a selenium / oxygen co-doped composite material, the preparation method is simple to operate, does not require special reagents or surfactants, and the prepared hollow bowl-shaped carbon-based metal / selenium / oxygen co-doped composite material has a stable shape, It has the advantages of hollow spherical structure with low density and large specific surface area. Specifically, the embodiment of the present invention discloses a method for preparing a hollow bowl-shaped carbon-based metal / selenium / oxygen co-doped composite material, including the following steps:

[0027] A) SiO 2 @Phenolic resin / S...

Embodiment 1

[0040] (1) Add 25mL TEOS to 515mL ethanol, 70mL water and 21mL ammonia water (25%wt%) solution, stir at room temperature for 20min, add resorcinol 2.8g and formaldehyde 4mL (37wt%), then stir at room temperature for 20h, Wash with distilled water and ethanol three times to collect the final solution, dry it in a vacuum oven at 60 °C for 12 h; then calcinate it in nitrogen at 800 °C for 2 h at a heating rate of 1 °C / min to obtain SiO 2 @C / SiO 2 ;

[0041] Disperse 1g of carbonized material in concentrated sulfuric acid at a mass ratio of 1:30, ultrasonicate at 30°C for 30min, collect by centrifugation with ethanol, and ultrasonically disperse 600mg of sulfonated carbon material into 2400mL, 4500mg of nickel nitrate hexahydrate, 8g of urea and 480mg of trisodium citrate Stir the solution at 80°C for 5 hours, cool to room temperature, collect the precipitate by centrifugation with ethanol, and dry at 60°C overnight;

[0042] (2) The material obtained in step (1) was etched away...

Embodiment 2

[0045] (1) Add 25mL TEOS to 515mL ethanol, 70mL water and 21mL ammonia water (25%wt%) solution, stir at room temperature for 20min, add resorcinol 2.8g and formaldehyde 4mL (37wt%), then stir at room temperature for 20h, Wash the final solution with distilled water and ethanol three times to collect the final solution, dry it in a vacuum oven at 60°C for 12h, and then calcinate it in nitrogen at 800°C for 2h at a heating rate of 1°C / min to obtain SiO 2 @C / SiO 2 ;

[0046] Disperse 1g of carbonized material in concentrated sulfuric acid at a mass ratio of 1:30, ultrasonicate at 30°C for 30min, and collect by centrifugation with ethanol; ultrasonically disperse 700mg of sulfonated carbon material into 2800mL of 5256mg of cobalt nitrate hexahydrate, 9.9g of urea and 576mg of tricitrate Stir in the sodium solution at 80°C for 5 hours, cool to room temperature, collect the precipitate by centrifugation with ethanol, and dry at 60°C overnight;

[0047] (2) The material obtained in...

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Abstract

The invention provides a preparation method of a hollow bowl-shaped carbon-based metal / selenium / oxygen co-doped composite material. The method comprises the following steps: A), carbonizing a SiO2@phenolic resin / SiO2 composite material, and performing sulfonating to obtain a sulfonated carbon material; B), mixing the sulfonated carbon material, metal salt, an amine compound and sodium citrate, andperforming reacting to obtain a composite material; C), etching silicon dioxide in the composite material to obtain a hollow carbon-doped metal oxide material; and D), mixing the hollow carbon-dopedmetal oxide material with selenium oxide, and performing sintering to obtain the hollow bowl-shaped carbon-based metal / selenium / oxygen co-doped composite material. The preparation process of the composite material is simple and convenient to operate, process parameters are easy to control, and the obtained bowl-shaped morphology has the advantages of low density, large specific surface area and the like of a hollow spherical structure, the material is more excellent in that the close packing density of the bowl-shaped morphology is higher than that of the hollow spherical structure, and is expected to be applied to the field of lithium ion battery negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a method for preparing a hollow bowl-shaped carbon-based metal / selenium / oxygen co-doped composite material and a lithium ion battery. Background technique [0002] Energy and environmental issues are two major problems restricting the development of today's society. Due to the advantages of large specific surface area, low density, and high stability, hollow structures have many applications in energy and the environment. The hollow bowl-shaped structure has a unique hollow structure, which has a higher packing density than the spherical hollow structure; metal oxides have high specific capacity in electrical energy storage applications, and the carbon layer can increase electrical conductivity and improve electrochemical performance. And the gap in the middle can buffer the volume expansion effect of the electrode material during the charging and discharging pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48H01M4/50H01M4/52H01M10/0525B22F9/20C01B19/00C01B19/02C01B32/05C01G49/02C01G51/04C01G53/04
CPCB22F9/20C01B19/00C01B19/004C01B19/02C01G49/02C01G51/04C01G53/04C01B32/05H01M4/483H01M4/502H01M4/523H01M4/625H01M10/0525Y02E60/10
Inventor 刘全兵李芳远
Owner GUANGDONG UNIV OF TECH
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