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Method for performing sulfur-doped phosphorus modification on carbon surface and application thereof

A sulfur doping, carbon surface technology, applied in structural parts, electrochemical generators, electrode manufacturing, etc., can solve problems such as poor affinity between phosphorus and negative electrode materials, improve environmental stability, simple process, and low raw material cost Effect

Pending Publication Date: 2022-06-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To realize this scheme, there are two problems to solve: the first is the poor affinity between phosphorus and negative electrode materials; the second is the stability of the phosphorus interface in the environment.

Method used

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  • Method for performing sulfur-doped phosphorus modification on carbon surface and application thereof
  • Method for performing sulfur-doped phosphorus modification on carbon surface and application thereof
  • Method for performing sulfur-doped phosphorus modification on carbon surface and application thereof

Examples

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Effect test

Embodiment 1

[0046] In this embodiment, the high-performance negative electrode material with a sulfur-doped phosphorus interface layer has a chemical composition of: sulfur, red phosphorus, and hard carbon-coated graphite (provided by Huawei). The hard carbon-coated graphite is coated with sulfur-doped red phosphorus. The preparation process of the negative electrode material is to first prepare a sulfur-phosphorus mixed material, and then use the sulfur-phosphorus mixed material as an evaporation source to make the sulfur-phosphorus mixed material and hard carbon-coated graphite composite; in the preparation process, the ratio of raw materials: the mass of sulfur accounts for sulfur 1% of the total mass of the phosphorus mixed material, and the mass ratio of the sulfur-phosphorus mixed material to the hard carbon-coated graphite is 3:97.

[0047] The specific operation steps are as follows:

[0048] (1) Preparation of hard carbon-coated graphite composites with sulfur-doped phosphorus i...

Embodiment 2

[0067] The method for preparing a hard carbon-coated silicon composite material with a sulfur-doped phosphorus interface layer provided in this embodiment, except that the material used in step (1) is hard carbon-coated silicon (the mass ratio of the hard carbon layer to the silicon is 3:7) composite material, and the remaining steps are the same as in Example 1.

Embodiment 3

[0069] The present embodiment provides a method for preparing a hard carbon-coated silicon oxide composite material with a sulfur-doped phosphorus interface layer, except that the material used in step (1) is a hard carbon-coated silicon oxide (hard carbon layer and The mass ratio of silicon oxide is 3:7) composite material, and the remaining steps are the same as in Example 1.

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Abstract

The invention belongs to the technical field of battery materials, and discloses a method for performing sulfur-doped phosphorus modification on a carbon surface and application of the method, the method comprises the following steps: mixing a phosphorus source and a sulfur source, and then performing heat treatment on the mixed phosphorus-sulfur mixed material and a raw material with a carbon-based surface at 300-600 DEG C to obtain a product, the introduction of sulfur can improve the deposition efficiency, uniformity and environmental stability of the phosphorus element on the carbon-based surface in the heat treatment process, and the correspondingly obtained material has a sulfur-doped phosphorus interface layer. According to the method disclosed by the invention, the high-performance battery negative electrode material with the sulfur-doped phosphorus interface layer can be particularly obtained, the high-performance battery negative electrode material is used as an alkali metal ion battery, and the sulfur-doped phosphorus interface layer has good environmental stability, so that the material can be used for manufacturing a battery electrode by using a water-based binder; and phosphides generated in the circulation process can improve the ionic conductivity of the material, so that the fast charging performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and more particularly relates to a method for modifying carbon surface with sulfur doped phosphorus and its application, which can be used as a high-performance negative electrode material for alkali metal ion batteries. Background technique [0002] With the popularization of electric vehicles and portable electronic devices, people are increasingly demanding high-performance secondary batteries. For example, the fast charging capability and high energy density of secondary batteries can shorten the charging time of electric vehicles and extend their cruising range, which greatly promotes the development of the electric vehicle market and the convenience of people's lives. At present, the main researched secondary batteries with high energy density mainly include: lithium ion battery, sodium ion battery and potassium ion battery. All three alkali metal ion batteries have their own adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/38H01M4/48H01M4/46H01M4/04H01M10/0525H01M10/054H01M4/13
CPCH01M4/366H01M4/364H01M4/587H01M4/386H01M4/387H01M4/483H01M4/463H01M4/38H01M4/0471H01M10/0525H01M10/054H01M4/13H01M2004/027Y02E60/10
Inventor 孙永明涂水彬
Owner HUAZHONG UNIV OF SCI & TECH
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