Self-supporting SiOx-based composite negative electrode material and preparation method thereof

A negative electrode material, self-supporting technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as poor conductivity and difficult preparation of composite negative electrodes, improve surface characteristics, improve electron transport performance, and enrich pores effect of structure

Inactive Publication Date: 2019-07-05
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But SiO x There is still the problem of poor conductivity, and SiO x It is difficult to prepare a uniformly dispersed composite negative electrode

Method used

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  • Self-supporting SiOx-based composite negative electrode material and preparation method thereof
  • Self-supporting SiOx-based composite negative electrode material and preparation method thereof
  • Self-supporting SiOx-based composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) 20g of graphene foam (G-F) is placed in a nitrogen-protected tube furnace, and the temperature in the furnace is kept at 300°C;

[0042] (2) After mixing 28g of silicon powder and 55g of silicon dioxide powder evenly and compacting them, place them in a vacuum tube furnace, keep the vacuum in the furnace at 10Pa, raise the temperature of the tube furnace to 1400°C, and keep it warm for 5 hours; and generate SiO x The gas is passed into the tube furnace in the previous step for surface deposition, the gas flow rate is 20ml / min, and the three-dimensional G-F@SiO x composite materials;

[0043] (3) Take 20g G-F@SiO x Put it in a tube furnace, pass it into a mixed atmosphere of methane and hydrogen, and raise the temperature to 700°C for 5 hours to obtain G-F@SiO x @C Composite anode material.

[0044] The obtained self-supporting material was directly used as a negative electrode sheet to assemble a button battery. Electrochemical tests show that its first coulomb...

Embodiment 2

[0046] (1) 10g of graphene foam (G-F) is placed in a nitrogen-protected tube furnace, and the temperature in the furnace is maintained at 300°C;

[0047] (2) After mixing 14g of silicon powder and 33g of silicon dioxide powder and compacting them evenly, place them in a vacuum tube furnace, keep the vacuum in the furnace at 50Pa, raise the temperature of the tube furnace to 1400°C, and keep it warm for 5h; and generate SiO x The gas is passed into the tube furnace in the previous step for surface deposition, the gas flow rate is 50ml / min, and the three-dimensional G-F@SiO x composite materials;

[0048] (3) Take 10g G-F@SiO x , and soak it in 50% glucose solution, after completely infiltrating, take it out and dry it, then put it in a tube furnace, keep it at 800°C for 4h, and get G-F@SiO x @C Composite anode material.

[0049] The obtained self-supporting material was directly used as a negative electrode sheet to assemble a button battery. Electrochemical tests show tha...

Embodiment 3

[0051] (1) Place 10g of copper foam (Cu-F) in a nitrogen-protected tube furnace, and keep the temperature in the furnace at 200°C;

[0052] (2) After mixing 14g of silicon powder and 32g of silicon dioxide powder and compacting them evenly, place them in a vacuum tube furnace, keep the vacuum in the furnace at 20Pa, raise the temperature of the tube furnace to 1450°C, and keep it warm for 5 hours; and generate SiO x The gas is passed into the tube furnace in the previous step for surface deposition, and the gas flow rate is 100ml / min to obtain a three-dimensional Cu-F@SiO x composite materials;

[0053] (3) Take 10g Cu-F@SiO x , placed in a tube furnace, fed with a mixed atmosphere of methane and hydrogen, and heated to 700 ° C, the holding time is 4h, to obtain Cu-F@SiO x @C Composite anode material.

[0054] The obtained self-supporting material was directly used as a negative electrode sheet to assemble a button battery. Electrochemical tests show that its first coulom...

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Abstract

The invention relates to a self-supporting SiOx-based composite negative electrode material and a preparation method thereof. The negative electrode material comprises a three-dimensional conductive inner core M, a SiOx layer and a carbonaceous shell. The SiOx gas is deposited in situ and coats the surface of the three-dimensional conductive inner core to form a three-dimensional frame structure of a three-dimensional conductive inner core M@SiOx layer, a carbon source precursor is employed for pyrolytic reaction and then coats the surface of the three-dimensional frame structure to form the carbonaceous shell. The preparation method of the self-supporting SiOx-based composite negative electrode material comprises the steps of: putting the three-dimensional conductive inner core into a furnace with inert gas shielding, introducing the SiOx gas into the furnace to deposit the SiOx gas on the surface of the three-dimensional conductive inner core to form a three-dimensional structure ofM@SiOx; and uniformly mixing the three-dimensional frame structure and the carbon source precursor to perform pyrolysis reaction to obtain the self-supporting SiOx-based composite negative electrode material. The self-supporting SiOx-based composite negative electrode material has the advantages of good structural stability, high first coulombic efficiency and good cycling stability. The preparation process is simple in flow, easy to control, low in synthesis cost and suitable for large-scale production.

Description

technical field [0001] The present invention relates to a SiO x Matrix composite negative electrode material and preparation method thereof, especially relate to a kind of SiO with self-supporting characteristic x Matrix composite negative electrode material and preparation method thereof. The invention belongs to the field of composite material and electrochemical technology. Background technique [0002] Lithium-ion battery is a typical representative of the current mainstream energy storage system, which has the advantages of stable performance, high capacity, good safety, and environmental protection. The application range of lithium-ion batteries is expanding day by day. It was used in portable electronic devices in the early stage. The development of electric vehicles has pushed the development of lithium-ion batteries to a new climax. However, due to the limitations of the electrode materials of the existing lithium-ion battery system, the energy density is difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/62H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 周昊宸周向清王鹏周进辉
Owner 湖南宸宇富基新能源科技有限公司
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