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Tin-phosphide composite material and preparation method and application thereof

A composite material and tin phosphide technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve problems such as poor conductivity and large volume expansion, and meet low equipment requirements, inhibit volume expansion, and good conductivity Effect

Active Publication Date: 2019-07-19
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems such as large volume expansion and poor conductivity when the tin phosphide synthesized by the current tin phosphide synthesis method is used as the battery negative electrode material, the invention provides a tin phosphide composite material and a preparation method thereof

Method used

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  • Tin-phosphide composite material and preparation method and application thereof
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  • Tin-phosphide composite material and preparation method and application thereof

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preparation example Construction

[0034] Specifically, the preparation method of the tin phosphide composite material at least includes the following steps:

[0035] Mixing tin source materials and carbon source materials and maintaining them under alkaline conditions for hydrothermal reaction to obtain hollow tin dioxide balls with carbon sources attached to the surface;

[0036] Under an inert atmosphere, carbonize the obtained hollow tin dioxide balls to obtain hollow tin dioxide balls with a carbon layer on the surface;

[0037] Mixing the hollow tin dioxide balls covered with carbon layer and the phosphorus source material, and heating in an inert atmosphere to make the two react to obtain the tin phosphide composite material;

[0038] The tin phosphide composite material at least contains tin phosphide, hollow tin dioxide and carbon, and the carbon is coated on the surface of the tin phosphide and hollow tin dioxide.

[0039] The preparation method of the above-mentioned tin phosphide composite material...

Embodiment 1

[0062] A preparation method of a tin phosphide composite material, specifically comprising the following steps:

[0063] (1) Weigh 1.5g of K 2 SnO 3 ·3H 2 O (potassium stannate), 1.2g urea, 1.2g polyvinyl alcohol (alcoholysis degree is 87%), prepare deionized water 180mL, absolute ethanol 120mL simultaneously;

[0064] (2) After mixing the above-mentioned potassium stannate, polyvinyl alcohol, urea, deionized water, and absolute ethanol until uniform, the first mixed material is obtained, and then the first mixed material is placed in the polytetrafluoroethylene liner React at 150° C. for 15 h in a reaction kettle, centrifuge and wash with ethanol and deionized water, and vacuum-dry at 60° C. for 12 h.

[0065] (3) The dried sample was placed in a tube furnace, fed with argon, reacted at 400° C. for 4 hours, and cooled to obtain a hollow spherical tin dioxide material coated with amorphous carbon on the surface.

[0066] (4) Mix 1.5 g of the hollow spherical tin dioxide ma...

Embodiment 2

[0076] A preparation method of a tin phosphide composite material, specifically comprising the following steps:

[0077] (1) Weigh 1.5g of K 2 SnO 3 ·3H 2 O (potassium stannate), 1.2g urea, 1.2g polyvinyl alcohol (87% degree of alcoholysis), and prepare 300mL of deionized water;

[0078] (2) After mixing the above-mentioned potassium stannate, polyvinyl alcohol, urea, and deionized water until uniform, the first mixed material is obtained, and then the first mixed material is placed in a reaction kettle with a polytetrafluoroethylene liner, React at 150°C for 15h, centrifuge and wash with ethanol and deionized water, and vacuum dry at 60°C for 12h.

[0079] (3) The dried sample was placed in a tube furnace, fed with argon, reacted at 400° C. for 4 hours, and cooled to obtain a hollow spherical tin dioxide material coated with amorphous carbon on the surface.

[0080](4) Get 1.5 g of the hollow spherical tin dioxide material obtained in step (3) and mix it with 8 g of sodiu...

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Abstract

The invention provides a tin-phosphide composite material and a preparation method and application thereof. The preparation method comprises the following steps: performing the hydrothermal reaction of a tin source material and a carbon source material under an alkaline condition to obtain a hollow tin dioxide ball with carbon sources attached to the surface; carrying out carbonization treatment of the tin dioxide in an inert atmosphere to obtain a hollow tin dioxide sphere coated with a carbon layer on the surface; and heating the hollow tin dioxide sphere coated with the carbon layer on thesurface and a phosphorus source material in an inert atmosphere to react, so as to obtain the composite material containing tin phosphide, hollow tin dioxide, carbon and carbon as a coating layer. Thematerial obtained by the preparation method of the tin-phosphide composite material contains tin phosphide, hollow tin dioxide and carbon, and the carbon is a coating layer, so that the tin phosphidecomposite material has good electrical conductivity, can effectively inhibit the volume expansion effect and improve the electrochemical performance of the battery when being used as a negative electrode active material of the battery, and the preparation method is simple in condition, low in requirement on equipment and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of tin phosphide materials, in particular to a tin phosphide composite material and its preparation method and application. Background technique [0002] With the rapid development of personal computers, cameras, mobile phones and mobile devices, as well as the rapid development of electric vehicles and hybrid vehicles, the demand for energy storage equipment is also increasing significantly. Secondary batteries have become the mainstream direction of mobile energy storage devices due to their cyclic charge and discharge characteristics. At present, the main secondary batteries are lithium-ion batteries. In lithium-ion batteries, the positive and negative materials are the core components of the battery. It directly determines the electrochemical performance of the battery. Therefore, the continuous research and development of positive electrode materials and negative electrode materials with excellent perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/387H01M4/5805H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 谷猛夏雨
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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