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Carbon-coated tin dioxide composite material as well as preparation method and application thereof

A technology of tin dioxide and composite materials, which is applied in the preparation/purification of tin oxide and carbon, secondary batteries, etc., can solve the problems of limiting material cost reduction, complicated preparation process, complicated process, etc., and achieves low production cost, Simple process and high quality effect

Active Publication Date: 2020-11-20
四川新能源汽车创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation process of carbon-coated tin dioxide composite materials is relatively complicated at this stage. For example, Chinese patent CN201811534972.3 discloses a preparation method of porous carbon / tin dioxide composite lithium-ion battery negative electrode materials. Water tin dichloride is mixed and vacuum-packaged, then heated to make porous carbon / tin dichloride composite material, and then roasted in air atmosphere to obtain the target product
This method is complicated in process and consumes a lot of energy, which greatly limits the reduction of material cost.

Method used

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  • Carbon-coated tin dioxide composite material as well as preparation method and application thereof
  • Carbon-coated tin dioxide composite material as well as preparation method and application thereof
  • Carbon-coated tin dioxide composite material as well as preparation method and application thereof

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preparation example Construction

[0025] The invention provides a method for preparing a carbon-coated tin dioxide composite material, comprising the following steps:

[0026] (1) polytetrafluoroethylene is mixed with an organic solvent to obtain a polytetrafluoroethylene suspension;

[0027] (2) After mixing the polytetrafluoroethylene suspension, tin dioxide and active solid particles, sequentially carry out solid-liquid separation and drying to obtain a mixed powder;

[0028] (3) The mixed powder is ignited, and after oxidation-reduction reaction is carried out, washing and drying are carried out in sequence to obtain a carbon-coated tin dioxide composite material.

[0029] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in this field.

[0030] The invention mixes polytetrafluoroethylene and organic solvent to obtain polytetrafluoroethylene suspension. In the present invention, the particle size of the polytetrafluoroethylene is...

Embodiment 1

[0049] Weigh 10 g of tetrafluoroethylene particles with a particle size of 30 μm and perform ultrasonic treatment in 400 mL of acetone, the ultrasonic power is 1800 W, and the ultrasonic time is 6 h, so that the polytetrafluoroethylene particles are broken and a stable dispersed polytetrafluoroethylene suspension is obtained. turbid liquid;

[0050] Weigh 5g of magnesium metal particles with a particle size of 3μm and 5g of tin dioxide particles with a particle size of 2μm and add them to the polytetrafluoroethylene suspension, continue to sonicate to mix evenly, the ultrasonic power is 2000W, and the ultrasonic time is 12h , to obtain a mixed suspension;

[0051] The obtained mixed suspension was centrifuged sequentially, and the precipitate was dried at 60°C for 12 hours to obtain a mixed powder;

[0052] Use a nickel-chromium alloy heating wire to ignite the mixed powder. The diameter of the nickel-chromium alloy heating wire is 0.24mm, the DC voltage is 30V, and the curre...

Embodiment 2

[0060] Weigh 20 g of tetrafluoroethylene particles with a particle size of 30 μm and stir them in 400 mL of ethanol at a rotation speed of 500 rpm for 10 hours to break the polytetrafluoroethylene particles and obtain a stable dispersed polytetrafluoroethylene suspension liquid;

[0061] Weigh 12g of magnesium metal particles with a particle size of 3μm and 8g of tin dioxide particles with a particle size of 1μm and add them to the polytetrafluoroethylene suspension, continue to stir to mix evenly, the speed is 200rpm, and the stirring time is 6h. Obtain a mixed suspension;

[0062] The obtained mixed suspension was centrifuged sequentially, and the precipitate was dried at 60°C for 12 hours to obtain a mixed powder;

[0063] Use a nickel-chromium alloy heating wire to ignite the mixed powder. The diameter of the nickel-chromium alloy heating wire is 0.24mm, the DC voltage is 30V, the current is 5A, and the oxidation-reduction reaction is carried out. After the combustion is ...

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Abstract

The invention provides a carbon-coated tin dioxide composite material as well as a preparation method and application thereof, and belongs to the technical field of preparation of lithium ion batterynegative electrode materials. The preparation method comprises the following steps: (1) mixing polytetrafluoroethylene with an organic solvent to obtain polytetrafluoroethylene turbid liquid; (2) mixing the polytetrafluoroethylene turbid liquid, stannic oxide and active solid particles, and sequentially carrying out solid-liquid separation and drying to obtain mixed powder; wherein the active solid particles comprise magnesium, aluminum, silicon, titanium or zirconium; and (3) igniting the mixed powder, carrying out a redox reaction, and sequentially washing and drying to obtain the carbon-coated tin dioxide composite material. The preparation method is simple, low in production cost, low in energy consumption and suitable for realizing industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode material preparation, and in particular relates to a carbon-coated tin dioxide composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, electric vehicles and other fields due to their high energy density, low cost, and stable performance. At present, the specific capacity of commercial graphite anode materials is low (372mAh / g), which has become one of the key factors restricting the further improvement of the energy density of secondary batteries. Among the new high-capacity anode materials, tin dioxide is a kind of anode material with great potential due to its high theoretical specific capacity (782mAh / g). However, the severe volume expansion of tin dioxide during the lithium intercalation process will cause the material to break and fragment, lose cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02C01B32/05H01M4/48H01M4/62H01M10/0525
CPCC01G19/02C01P2002/70C01P2002/82C01P2004/04C01P2006/40C01B32/05H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 贺川王迎春刘金旭冯新娅蔡奇
Owner 四川新能源汽车创新中心有限公司