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Composite material with hollow graphene spheres loaded with nanometer tin disulfide and method for preparing composite material

A graphene ball, tin disulfide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of volume expansion, electrode powderization, storage capacity and cycle life decline, etc., Achieve the effect of inhibiting agglomeration, low cost of raw materials, and improving transportation capacity

Active Publication Date: 2016-06-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tin disulfide has been widely concerned by researchers in recent years due to its low lithium intercalation voltage and high theoretical capacity (645mAh / g). The same material, the problem of the lithium-ion battery negative electrode material is that in the process of intercalation and delithiation, the volume expands, which leads to the pulverization of the electrode, resulting in a rapid decline in storage capacity and cycle life.

Method used

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  • Composite material with hollow graphene spheres loaded with nanometer tin disulfide and method for preparing composite material
  • Composite material with hollow graphene spheres loaded with nanometer tin disulfide and method for preparing composite material
  • Composite material with hollow graphene spheres loaded with nanometer tin disulfide and method for preparing composite material

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Effect test

Embodiment 1

[0022] A preparation method of hollow graphene sphere loaded nano-tin disulfide composite material, the steps of the method are as follows:

[0023] Take 0.3g of the initiator potassium persulfate and add it to a three-neck round-bottomed flask, then add 50mL of deionized water, add the rotor to stir the potassium persulfate solution, pass in nitrogen protection, heat to 60°C, then add 2mL of styrene monomer, condense and reflux Reacted for 24 hours, condensed and refluxed for 7 hours, then added 500 μL of methacryloyloxyethyltrimethylammonium chloride, after the reaction, washed with deionized water, dried in vacuum for 12 hours, and the solid obtained after drying was the cation type polystyrene ball;

[0024] Disperse the obtained cationic polystyrene balls in water, sonicate for 1h, take a certain amount of graphene oxide solution and sonicate for 1h, after ultrasonication, mix the dispersed graphene oxide aqueous solution with cationic polystyrene balls in a mass ratio of...

Embodiment 2

[0029] A kind of preparation method of hollow graphene sphere loaded nano tin disulfide composite material, the steps of the method are as follows

[0030] Take 0.25g of initiator potassium persulfate into a three-neck round-bottomed flask, add 50mL of deionized water, add a rotor to stir the potassium persulfate solution, pass in nitrogen protection, heat to 75°C, then add 5mL of styrene monomer, condense and reflux React for 24 hours, condense and reflux for 5 hours, then add 500 μL of methacryloyloxyethyltrimethylammonium chloride. After the reaction, wash with deionized water and dry in vacuum for 6 hours. The solid obtained after drying is the cation type polystyrene ball;

[0031] Disperse the obtained cationic polystyrene balls in water, sonicate for 1 hour, take a certain amount of graphene oxide solution and sonicate for 1 hour, after ultrasonication, mix the dispersed graphene oxide aqueous solution with cationic polystyrene balls at a mass ratio of 1:3, and then Ul...

Embodiment 3

[0034] A kind of preparation method of hollow graphene sphere loaded nano tin disulfide composite material, the steps of the method are as follows

[0035] Take 0.5g of the initiator potassium persulfate and add it to a three-neck round-bottomed flask, then add 50mL of deionized water, add the rotor to stir the potassium persulfate solution, pass in nitrogen protection, heat to 85°C, then add 8mL of styrene monomer, condense and reflux React for 24 hours, condense and reflux for 10 hours, then add 400 μL of methacryloyloxyethyltrimethylammonium chloride. After the reaction, wash with deionized water and dry in vacuum for 12 hours. The solid obtained after drying is the cation type polystyrene ball;

[0036] Disperse the obtained cationic polystyrene balls in water, sonicate for 1 hour, take a certain amount of graphene oxide solution and sonicate for 1 hour, after ultrasonication, mix the dispersed graphene oxide aqueous solution with cationic polystyrene balls at a mass ratio...

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Abstract

The invention discloses a composite material with hollow graphene spheres loaded with nanometer tin disulfide. The composite material is characterized in that the hollow graphene spheres with sub-micron sizes are used as carriers, tin disulfide nanometer particles are loaded on the inner walls and the outer walls of the hollow graphene spheres, and the sizes of the tin disulfide nanometer particles grown on the surfaces of the hollow graphene spheres range from 10 nm to 40 nm. A method for preparing the composite material includes steps of a, synthesizing cationic polystyrene spheres; b, synthesizing the hollow graphene spheres; c, loading the tin disulfide to obtain the composite material with the hollow graphene spheres loaded with the nanometer tin disulfide. The composite material and the method have the advantages that the composite material is a carbon material with a two-dimensional structure, the tin disulfide with an expanded volume can be accommodated in charging and discharging procedures, and the electric conductivity and the structural stability of electrode materials can be improved; the electric conductivity and the ion transport performance of the materials can be improved by porous graphene structures, and the composite material is favorable for embedding lithium ions in the materials and releasing the lithium ions from the materials.

Description

technical field [0001] The invention relates to a hollow graphene sphere-loaded nano-tin disulfide composite material used as a negative electrode material of a lithium battery and a preparation method thereof, belonging to the technical field of electrochemistry and material synthesis. Background technique [0002] Lithium-ion batteries have become the most widely used secondary batteries in the world today because of their high energy density, long cycle life, and no memory effect. With the further development of lithium-ion battery research, the development of battery materials with high capacity, high rate performance and long cycle life has become the focus of this field. At present, the negative electrode materials actually used in lithium-ion batteries are generally carbon materials, such as graphite, soft carbon, hard carbon, etc. Carbon anode materials (theoretical capacity 372mAh / g) can no longer meet the needs of high capacity in the future, and various metal com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82Y30/00H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525
CPCB82Y30/00H01M4/362H01M4/5815H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 蒋永赵兵王志轩高阳陈芳杨雅晴高强焦正
Owner SHANGHAI UNIV
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