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Preparation method for nanometer red phosphorus and graphene composite negative electrode material

A graphene composite and negative electrode material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of uneven particle size distribution, time-consuming and labor-intensive, high energy consumption, etc., to achieve uniform distribution , a wide range of sources, the effect of a large reaction surface

Active Publication Date: 2017-10-24
深圳市泽纬科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] The particle size distribution of commercially available commercial red phosphorus is uneven. At present, the refinement of red phosphorus is mostly carried out by ball milling, which not only consumes high energy, but also takes time and trouble. The particle size of the obtained red phosphorus is at the micron level; The red phosphorus / carbon composite material has high requirements on the reaction vessel, and also has the problem of high energy consumption, and there may be conversion of red phosphorus to toxic white phosphorus

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  • Preparation method for nanometer red phosphorus and graphene composite negative electrode material
  • Preparation method for nanometer red phosphorus and graphene composite negative electrode material

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Embodiment 1

[0028] Example 1, see figure 1 and figure 2 :

[0029] The invention provides a preparation method of nano red phosphorus and graphene composite negative electrode material, comprising the following steps:

[0030] (1) Preparation of sub-micron red phosphorus: Take 0.5 g of commercial red phosphorus, add water and wet mill for 5 min, transfer to a reaction kettle filled with 60 mL of deionized water, disperse by ultrasonic treatment for 1 h, and disperse at 200 °C, Carry out solvothermal reaction at a speed of 1000r / min for 12 hours. After the reaction is completed, naturally cool to room temperature, filter with suction, and filter and wash with deionized water. The filter residue is dried in a vacuum oven at 60°C for 12 hours to obtain submicron red phosphorus;

[0031] (2) Preparation of graphene oxide: Ultrasound-assisted improved Hummers method was used to add 1.0g flake graphite to 23mL 0°C concentrated sulfuric acid under stirring conditions and slowly add 3.0g pota...

Embodiment 2

[0035] The invention provides a preparation method of nano red phosphorus and graphene composite negative electrode material, comprising the following steps:

[0036] (1) Preparation of submicron red phosphorus: take 0.7g of commercial red phosphorus, add water and wet mill for 5min, transfer to a reaction kettle filled with 60mL of absolute ethanol, disperse by ultrasonic treatment for 1h, and disperse at 180℃, Carry out solvothermal reaction at a speed of 750r / min for 24 hours. After the reaction is completed, naturally cool to room temperature, filter with suction, and filter and wash with absolute ethanol. The filter residue is dried in a vacuum oven at 60°C for 12 hours to obtain submicron red phosphorus;

[0037] (2) Preparation of graphene oxide: Ultrasound-assisted improved Hummers method was used to add 1.0g flake graphite to 23mL 0°C concentrated sulfuric acid under stirring conditions and slowly add 3.0g potassium permanganate, react at low temperature for 2h, and i...

Embodiment 3

[0040] The invention provides a preparation method of nano red phosphorus and graphene composite negative electrode material, comprising the following steps:

[0041](1) Preparation of submicron-sized red phosphorus: Take 1.0 g of commercial red phosphorus, add water and wet mill for 5 min, transfer it to a reaction kettle filled with 60 mL of anhydrous ether, and disperse it by ultrasonic treatment for 1 h. Carry out solvothermal reaction at a speed of 500r / min for 24 hours. After the reaction is completed, naturally cool to room temperature, filter with suction, and filter and wash with anhydrous ether. The filter residue is dried in a vacuum oven at 60°C for 12 hours to obtain submicron red phosphorus;

[0042] (2) Preparation of graphene oxide: Ultrasound-assisted improved Hummers method was used to add 1.0g flake graphite to 23mL 0°C concentrated sulfuric acid under stirring conditions and slowly add 3.0g potassium permanganate, react at low temperature for 2h, and in the...

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Abstract

The invention provides a preparation method for a nanometer red phosphorus and graphene composite negative electrode material. The preparation method comprises the following steps of preparing submicron red phosphorus, in which commercial red phosphorus is used as a raw material, and the submicron red phosphorus is prepared by wet grinding, dispersion and solvothermal reaction; preparing graphene oxide, in which the graphene oxide is prepared by employing an ultrasound-assisted improved Hummers method; and preparing the composite negative electrode material, in which the submicron red phosphorus is added into a graphene oxide solution, and a finished product of the nanometer red phosphorus and graphene composite negative electrode material is obtained by secondary hydrothermal reaction, filtering and drying under stirring. Submicron red phosphorus particles are prepared by the solvothermal method and are further reduced to nanoscale by secondary hydrothermal reaction, meanwhile, the graphene oxide is reduced and wraps surface of the red phosphorus, the preparation method has the advantages of moderate reaction condition, simple equipment, safety, reliability and the like, and is simple and convenient to operate, and the nanometer red phosphorus and graphene composite negative electrode material has relatively good charge-discharge cycle property and rate performance when used as a lithium / sodium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of manufacturing negative electrode materials for batteries, in particular to a method for preparing a composite negative electrode material of nanometer red phosphorus and graphene. Background technique [0002] With the depletion of oil resources, clean energy technology has attracted increasing attention. As a secondary rechargeable chemical power source, lithium-ion batteries have excellent performance, such as: high energy, low consumption, and no memory effect. The research on the lithium storage performance of lithium-ion battery anode materials is an important way to improve the performance of lithium-ion batteries. [0003] The theoretical specific capacity of elemental red phosphorus is 2596mAh / g. It is a lithium-ion negative electrode material with application potential second only to silicon in theoretical specific capacity, and has the advantages of abundant reserves, low price, and non-toxicity...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5805H01M4/583Y02E60/10
Inventor 袁颂东朱星袁泽纬熊剑江国栋
Owner 深圳市泽纬科技有限公司
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