Hollow core-shell antimony-carbon composite negative electrode material, preparation method thereof and secondary battery

A technology for negative electrode materials and secondary batteries, which is applied in the direction of secondary batteries, negative electrodes, battery electrodes, etc., can solve the problems of high preparation cost, complicated method, and high volume expansion rate of antimony-based negative electrode materials, and achieve high Effects of antimony component utilization, simple operation, and easy access

Inactive Publication Date: 2021-06-01
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Application Information

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Problems solved by technology

[0005] The purpose of this application is to provide a hollow core-shell type antimony-carbon composite negative electrode material and its preparation method, as well as a secondary battery, aiming to solve the problem of high preparation cost of antimony-based negative electrode materials, complicated methods, and the The high volume expansion rate of the material limits its application in secondary batteries

Method used

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  • Hollow core-shell antimony-carbon composite negative electrode material, preparation method thereof and secondary battery
  • Hollow core-shell antimony-carbon composite negative electrode material, preparation method thereof and secondary battery
  • Hollow core-shell antimony-carbon composite negative electrode material, preparation method thereof and secondary battery

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preparation example Construction

[0030] A first aspect of the embodiments of the present application provides a method for preparing a hollow core-shell type antimony-carbon composite negative electrode material, comprising the following steps:

[0031] S10. Obtain antimony oxide compound, disperse antimony oxide group and polymerizable monomer in water, add an oxidant to carry out a polymerization reaction, and obtain an antimony oxide compound coated with polymer;

[0032] S20. Perform thermal reduction treatment on the polymer-coated antimony oxide compound to obtain a hollow core-shell type antimony-carbon composite negative electrode material.

[0033]The method for preparing a hollow core-shell type antimony-carbon composite negative electrode material provided in the first aspect of the present application, through an oxidative polymerization reaction, polymerizable monomers are polymerized on the surface of an oxo antimonide to form a polymer coating layer, and a polymer-coated antimony compound is obt...

Embodiment 1

[0060] A hollow core-shell type antimony carbon composite negative electrode material, the preparation of which comprises the steps of:

[0061] (1) Preparation of rod-shaped antimony oxide

[0062] Dissolve 70ml ethylenediamine (purity ≥99%) and 4g polyvinylpyrrolidone (purity ≥99%, average molecular weight 24000) in deionized water, add 4g crude elemental antimony powder (30 mesh, purity ≥99%), Stir at room temperature until the suspension changes from gray to milky white, and no black antimony particles settle at the bottom after standing for a while. After the reaction, the suspension was filtered to obtain a precipitate, which was washed twice with water and then dried to obtain rod-shaped antimony oxide.

[0063] (2) Polypyrrole coating of rod-shaped antimony oxide

[0064] The rod-shaped antimony oxide (2 g) prepared in the previous step was dispersed in deionized water (200 mL) to obtain a milky white suspension, followed by adding an appropriate proportion of pyrrol...

Embodiment 2

[0069] A hollow core-shell type antimony carbon composite negative electrode material, the preparation steps of which are basically the same as those in Example 1, the difference is that commercial antimony oxide nanoparticles are directly used in step (1).

[0070] A sodium ion battery, using the hollow core-shell type antimony carbon composite negative electrode material prepared in Example 2 as a negative electrode, the negative electrode material is matched with sodium metal, and assembled into a 2032 type button battery for performance testing.

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Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a hollow core-shell antimony-carbon composite negative electrode material, a preparation method thereof and a secondary battery. The preparation method comprises the following steps: obtaining an oxygen group antimonide, dispersing the oxygen group antimonide and a polymerizable monomer in water, and adding an oxidizing agent to carry out polymerization reaction, so as to obtain a polymer-coated oxygen group antimonide; and carrying out thermal reduction treatment on the polymer-coated oxyantimonide to obtain the hollow core-shell antimony-carbon composite negative electrode material. According to the preparation method of the hollow core-shell antimony-carbon composite negative electrode material, the adopted raw materials are low in cost and easy to obtain, operation is easy, dependence on precious equipment is avoided, and the preparation method is suitable for industrial large-scale production and application. And the prepared hollow core-shell antimony-carbon composite material is high in conductive efficiency, high in specific capacity and good in stability.

Description

technical field [0001] The application belongs to the technical field of secondary batteries, and in particular relates to a hollow core-shell type antimony carbon composite negative electrode material and a preparation method thereof, and a secondary battery. Background technique [0002] Electricity is one of the indispensable energy sources in modern society, but currently power generation still mainly relies on fossil fuels such as coal, oil and natural gas, and the massive consumption of fossil fuels and the greenhouse effect caused by carbon dioxide emissions are topics of increasing concern. Rechargeable batteries such as lithium-ion batteries have the characteristics of high energy density, environmental friendliness, and easy installation. They are energy devices that are very suitable for smart grid energy storage. At present, batteries in the field of energy storage are still dominated by lithium-ion batteries, but there is a very large gap between their supply an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/054
CPCH01M4/38H01M4/625H01M4/628H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 谷猛杨旭明祝远民赵海燕
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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