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Preparation method of porous carbon skeleton tin-coated composite electrode material

A composite electrode and porous carbon technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of time and energy consumption, poor specific capacity and rate characteristics, complicated preparation operations, etc., to increase chemical reaction sites, The effect of reducing charge transfer impedance and avoiding agglomeration

Active Publication Date: 2019-05-21
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of complex preparation operation, time-consuming and energy-consuming, and poor specific capacity and rate characteristics of the existing tin-carbon composite materials, the present invention provides a preparation method of a porous carbon skeleton-coated tin composite electrode material, based on which the obtained The particle size of tin dioxide is less than 10nm, and the specific capacity and rate characteristics are good

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  • Preparation method of porous carbon skeleton tin-coated composite electrode material
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  • Preparation method of porous carbon skeleton tin-coated composite electrode material

Examples

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Embodiment 1

[0032] This embodiment provides a method for preparing an N-doped porous tin-carbon anode material for lithium ion batteries. The method takes into account the performance of the material and the synthesis process and its cost. The raw materials include anhydrous tin tetrachloride, acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate; specifically including the following steps:

[0033] (1) Using anhydrous tin tetrachloride as the tin source, measure an appropriate amount of anhydrous tin tetrachloride and dissolve it in deionized water, form a uniform transparent solution under stirring conditions, and prepare a 2.8mol / L tin chloride aqueous solution. Place to cool;

[0034] (2) Add acrylamide, N,N'-methylenebisacrylamide and ammonium persulfate to 20ml of tin tetrachloride aqueous solution, wherein the mass ratio of acrylamide to anhydrous tin tetrachloride is 1:15, The amount of ammonium persulfate used is 2.5% of the mass of acrylamide, and the mass ratio of N,N'-methy...

Embodiment 2

[0038] This embodiment provides a method for preparing an N-doped porous tin-carbon anode material for lithium ion batteries. The method takes into account the performance of the material and the synthesis process and its cost. The raw materials include anhydrous tin tetrachloride, acrylamide, N,N'-methylenebisacrylamide, sodium persulfate; specifically including the following steps:

[0039] (1) Using anhydrous tin tetrachloride as the tin source, measure an appropriate amount of anhydrous tin tetrachloride and dissolve it in deionized water, form a uniform transparent solution under stirring conditions, and prepare a 4.2mol / L tin chloride aqueous solution. Place to cool;

[0040] (2) Add acrylamide, N,N'-methylenebisacrylamide and sodium persulfate to 20ml of tin tetrachloride aqueous solution, where the mass ratio of acrylamide to anhydrous tin tetrachloride is 1:12, The amount of sodium persulfate used is 4% of the mass of acrylamide, and the mass ratio of N,N'-methylenebisyla...

Embodiment 3

[0048] This embodiment provides a method for preparing an N-doped porous tin-carbon anode material for lithium ion batteries. The method takes into account the performance of the material and the synthesis process and its cost. The raw materials include anhydrous tin tetrachloride, acrylamide, N,N'-methylenebisacrylamide, sodium persulfate; specifically including the following steps:

[0049] (1) Using crystalline tin tetrachloride as the tin source, weigh an appropriate amount of crystalline tin tetrachloride and dissolve it in deionized water, form a uniform transparent solution under stirring conditions, prepare a 1.5mol / L tin chloride aqueous solution, and place it to cool ;

[0050] (2) Add acrylamide, N,N'-methylenebisacrylamide and sodium persulfate to 20ml of tin tetrachloride aqueous solution, where the mass ratio of acrylamide to crystalline tin tetrachloride is 1:8. Potassium sulfate and sodium bisulfite (K 2 S 2 O 8 / NaHSO 3 The use amount of) is 1% of the mass of acry...

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Abstract

The invention discloses a preparation method of a porous carbon skeleton tin-coated composite electrode material, and belongs to the technical field of electrode material preparation. A water-solubletin source, acrylamide, a cross-linking agent and an initiator are adopted to prepare a gel precursor solution, and polymerization is performed to form gel of a three-dimensional network structure, and then low-temperature carbonization treatment is carried out on the gel to obtain the tin-based carbon composite electrode material. The polyacrylamide gel composite tin source is prepared and effectively dispersed, and a carbon skeleton formed by low-temperature carbonization can be used for fixing tin dioxide nanoparticles, so that the phenomena of large volume expansion and easy pulverizationof the tin-based material in a charging or discharging process are improved; moreover, polyacrylamide is doped with nitrogen atoms in situ while providing a carbon source, so that the material conductivity is improved; the particle size of generated tin dioxide is less than 10 nm, so that chemical reaction sites can be added, and high specific capacity, high energy density and good rate performance are presented; and compared with an existing process, the preparation method has the advantages of simple preparation process, low preparation temperature and low process cost, and is easy for industrial large-scale production.

Description

Technical field [0001] The invention belongs to the technical field of electrode material preparation, and specifically relates to a preparation method of a porous carbon skeleton-coated tin composite electrode material. Background technique [0002] At present, the field of new energy technology has become the focus of active research in countries all over the world. With the reduction of non-renewable energy and serious environmental problems, the development and utilization of new energy has become urgent. With the development of new energy sources, problems of energy storage and conversion have emerged. People are paying more and more attention to chemical energy storage devices. As an important energy storage and conversion device, chemical energy storage devices can be widely used in all aspects by virtue of their high energy density, convenient use, high energy conversion efficiency, low pollution, and ability to withstand various environmental tests. Electrode materials...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCY02E60/10
Inventor 吴孟强李文磊徐自强廖家轩冯婷婷周海平巩峰陈治马云飞李湜
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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