Graphene composite electrode material and preparation method and application thereof

A graphene composite and electrode material technology, applied in the field of materials, can solve problems such as unfavorable electron transmission and poor cycle performance, and achieve the effect of simple process, high controllability and high quality

Inactive Publication Date: 2017-08-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional lithium-ion batteries are difficult to meet such demands, therefore, it is necessary to find new electrode materials to meet the demands of energy storage
Emerging anode materials such as metal oxides, tin, and silicon have attracted more and more attention due to their ultra-high capacity, however, these electrode active materials are electrically insulating, which is not conducive to the transport of electrons, and the higher capacity is also Brings poor cycle performance

Method used

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  • Graphene composite electrode material and preparation method and application thereof
  • Graphene composite electrode material and preparation method and application thereof
  • Graphene composite electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, prepare silicon monoxide-graphene composite electrode material

[0041] 1) Put the silicon monoxide powder in an atmospheric tube furnace and pre-calcine at 1200°C for 5 hours under an argon atmosphere, so that the disproportionation reaction of silicon monoxide occurs, and a mixed phase of silicon dioxide, silicon and silicon oxide is obtained, and the temperature is lowered to 25°C;

[0042] 2) Put the mixed phase obtained in step 1) into a quartz boat, and put it into a chemical vapor deposition furnace. The equipment is heated to 1000°C at a heating rate of 20°C / min, and then methane is introduced under the protection of argon and hydrogen (the mixture of argon and hydrogen is also used as the carrier gas of methane, and the carbon source gas methane accounts for the carbon source and the carrier gas. The percentage of total gas volume is 0.5%) to react, and methane performs chemical adsorption, nucleation and growth on the surface of pre-calcined sil...

Embodiment 2

[0047] Embodiment 2, using titanium dioxide as growth substrate to prepare titanium dioxide-graphene composite electrode material

[0048] 1) Precalcining the titanium dioxide powder in an atmospheric tube furnace at 200°C for 1 hour in an air atmosphere, removing surface moisture, and cooling down to 25°C;

[0049] 2) Put the calcined titanium dioxide powder into a quartz boat and put it into a chemical vapor deposition furnace. The equipment is heated to 800°C at a heating rate of 20°C / min, and then ethylene is fed under the protection of argon and hydrogen for reaction. Ethylene is a gaseous reaction precursor for chemical adsorption, nucleation and growth on the surface of pre-calcined titanium dioxide. , the reaction time is 60min, and the percentage of carbon source gas ethylene accounting for carbon source and carrier gas (the mixed gas of above-mentioned argon and hydrogen) total volume is 2%;

[0050] 3) After the reaction is over, wait for the equipment to cool down...

Embodiment 3

[0051] Example 3, Preparation of SiO2-Graphene Composite Electrode Material Using Nanoscale SiO2 Powder

[0052]1) Pre-calcine the silica powder in an atmospheric tube furnace at 100°C for 1 hour in an air atmosphere, remove surface moisture, and cool down to 25°C;

[0053] 2) Put the calcined silica powder into a quartz boat and put it into a chemical vapor deposition furnace. The equipment is heated to 600°C at a heating rate of 20°C / min, and then ethylene is passed through under the protection of argon and hydrogen for reaction. Acetylene is a gaseous reaction precursor for chemical adsorption and nucleation on the surface of pre-calcined silica and growth, the reaction time is 60min, and the carbon source gas acetylene accounts for 2% of the total volume of the carbon source and the carrier gas (a mixture of the above-mentioned argon and hydrogen);

[0054] 3) After the reaction is completed, the temperature of the equipment is lowered to 25° C. to obtain a black powder m...

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Abstract

The invention discloses a graphene composite electrode material and a preparation method and application thereof. The graphene composite electrode material comprises a lithium ion battery electrode material and graphene, wherein the graphene is coated on a surface of the lithium ion battery electrode material, and the thickness of the graphene is 0.3-5 nanometers. The preparation method of the graphene composite electrode material comprises the following steps of 1) calcining a lithium ion battery electrode raw material, and reducing a temperature after calcination is completed; and 2) rising the temperature of the lithium ion battery electrode material processed in the step 1), and introducing a carbon source for chemical vapor deposition reaction, thereby obtaining the graphene composite electrode material. The preparation method is simple, is high in controllability and is suitable for industrial continuous production.

Description

technical field [0001] The invention relates to a graphene composite electrode material and a preparation method and application thereof, belonging to the field of materials. Background technique [0002] Lithium-ion battery is a common electrochemical energy storage device, which is widely used in electronic consumer products due to its stable cycle performance, high energy density, environmental friendliness and safety. The ultimate requirements of lithium-ion batteries are light weight, small size, long life, fast charge and discharge, and can be used under extreme conditions. However, traditional lithium-ion batteries are difficult to meet such demands, therefore, it is necessary to find new electrode materials to meet the demands of energy storage. Emerging anode materials such as metal oxides, tin, and silicon have attracted more and more attention due to their ultra-high capacity, however, these electrode active materials are electrically insulating, which is not con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 刘忠范史刘嵘彭海琳
Owner PEKING UNIV
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