SiOx-C composite negative electrode material with core-shell structure and preparation method thereof

A core-shell structure and negative electrode material technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of poor conductivity and difficult preparation of SiOx, and achieve high conductivity, high first Coulomb efficiency, and easy large-scale production. Effect

Inactive Publication Date: 2019-06-14
CENT SOUTH UNIV
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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 nano-scale SiO x more difficult to prepare

Method used

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  • SiOx-C composite negative electrode material with core-shell structure and preparation method thereof
  • SiOx-C composite negative electrode material with core-shell structure and preparation method thereof
  • SiOx-C composite negative electrode material with core-shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Place 100g of carbon black powder (CB) in an argon-protected tube furnace, and keep the temperature in the furnace at 250°C;

[0040] (2) After mixing 28g of silicon powder and 60g of silicon dioxide powder and compacting them evenly, place them in a vacuum tube furnace, keep the vacuum degree in the furnace at 50Pa, raise the temperature of the tube furnace to 1350°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, and the gas flow rate is 20ml / min to obtain CB@SiO x composite materials;

[0041] (3) Combine 20g glucose with 10gCB@SiO x After mixing evenly, put it in a tube furnace, pass it into a nitrogen atmosphere for protection, and raise the temperature to 800°C for 6 hours to obtain CB@SiO x @C Composite anode material.

[0042] The four-probe test showed that the obtained CB@SiO x The electronic conductivity of the @C composite anode material is 0.18S / cm; electrochemical te...

Embodiment 2

[0044] (1) 50g of artificial graphite powder (AG) is placed in a nitrogen-protected tubular furnace, and the temperature in the furnace is maintained at 300°C;

[0045] (2) After mixing 28g of silicon powder and 66g of silicon dioxide powder evenly and compacting them, 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 4 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 50ml / min, and AG@SiO x composite materials;

[0046] (3) Mix 20g pitch with 10g AG@SiO x After mixing evenly, put it in a tube furnace, pass it into a nitrogen atmosphere for protection, and raise the temperature to 850 ° C, and the holding time is 6 hours to obtain AG@SiO x @C Composite anode material.

[0047] The four-probe test showed that the obtained AG@SiO x The electronic conductivity of the @C composite anode material ...

Embodiment 3

[0049] (1) 50g titanium dioxide (TiO 2 ) is placed in a nitrogen-protected tube furnace, and the temperature in the furnace is maintained at 300°C;

[0050] (2) After mixing 28g of silicon powder and 58g of silicon dioxide powder evenly and compacting them, place them in a vacuum tube furnace, keep the vacuum in the furnace at 50Pa, raise the temperature of the tube furnace to 1350°C, and keep it warm for 4 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 200ml / min to obtain TiO 2 @SiO x composite materials;

[0051] (3) Mix 15g pitch with 10g TiO 2 @SiO x After mixing evenly, place it in a tube furnace, pass it into a nitrogen atmosphere for protection, and raise the temperature to 800°C for 5 hours to obtain TiO 2 @SiO x @C Composite anode material.

[0052] The four-probe test showed that the obtained TiO 2 @SiO x The electronic conductivity of the @C composite anode material is...

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Abstract

The invention relates to a SiOx-C composite negative electrode material with a core-shell structure and a preparation method thereof. The composite negative electrode material comprises a conductive core M, a SiOx layer and a carbonaceous shell; the surface of the conductive core M is coated with SiOx gas in an in-situ deposition mode to form a core-shell structure of the conductive core M@SiOx layer; the surface of the core-shell structure is coated with a carbon source precursor through a pyrolytic reaction to form the carbonaceous shell; the preparation method comprises the following stepsof placing the conductive core in a furnace with inert gas protection; introducing the SiOx gas into the furnace to deposit on the surface of the conductive core to form the M@SiOx core-shell structure; and carrying out uniform mixing on the core-shell structure and the carbon source precursor and then performing the pyrolysis reaction to obtain the M@SiOx-C composite negative electrode material with the core-shell structure. The SiOx-C composite negative electrode material with the core-shell structure prepared in the invention has the advantages of high conductivity, high first coulombic efficiency and high cycling stability. The preparation method is simple in process flow, easy to control, low in synthesis cost and suitable for large-scale production.

Description

technical field [0001] The present invention relates to a kind of SiO2 for lithium ion battery x -C composite negative electrode material and preparation method thereof, especially relate to a kind of SiO with core-shell structure x -C composite negative electrode material and preparation method thereof. The invention belongs to the field of composite material and electrochemical technology. Background technique [0002] As a green and environmentally friendly new energy battery system, lithium-ion batteries have been used in all aspects of human life since they were first commercialized in 1990 due to their environmental friendliness, multiple charge and discharge capabilities, and high voltage. From small portable electronic devices to large power vehicles, unprecedented development has been achieved. With the expansion of its application scope, human beings have put forward higher requirements for the energy density of lithium-ion battery systems. However, the current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/58H01M4/587H01M4/38H01M10/0525
CPCY02E60/10
Inventor 唐晶晶杨娟王辉周向阳
Owner CENT SOUTH UNIV
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