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Negative electrode material of graphite surface-coated with silicon/carbon double layers and preparation method thereof
The invention provides a preparation method of a negative electrode material of graphite surface-coated with silicon/carbon double layers. The preparation method comprises the following steps: (1) putting graphite particles into a vacuum heat treatment furnace; (2) after a set temperature is reached, introducing a gaseous silicon source to coat the surfaces of the graphite particles with a siliconlayer; and (3) after a set temperature is reached, introducing a gaseous carbon source to coat the surface of a silicon film with a carbon layer. The invention also discloses the negative electrode material of graphite surface-coated with the silicon/carbon double layers prepared by using the method. According to the preparation method of the negative electrode material, a silicon material can beuniformly distributed in the whole negative electrode material system, and the phenomenon of non-uniform expansion in the charging and discharging process is avoided. The negative electrode materialstructure provided by the invention is expected to have excellent rate capability, cycling stability and high specific capacity at the same time.
本发明提供了一种石墨表面硅/碳双层包覆的负极材料的制备方法，(1)将石墨颗粒置于真空热处理炉中；(2)到达设定温度后，通入气态硅源，使石墨颗粒表面包覆一层硅层；(3)到达设定温度后，通入气态碳源，使硅薄膜表面包覆一层碳层。本发明还公开了一种采用上述方法制备得到的石墨表面硅/碳双层包覆的负极材料。本发明中所述负极材料的制备方法可使硅材料非常均匀地分布于整个负极材料体系中，在充放电过程中不会产生膨胀不均匀现象。本发明中所述的负极材料结构可望同时具备优异的倍率特性、循环稳定性以及高的比容量。
Negative electrode material of graphite surface-coated with silicon/carbon double layers and preparation method thereof
The invention provides a preparation method of a negative electrode material of graphite surface-coated with silicon/carbon double layers. The preparation method comprises the following steps: (1) putting graphite particles into a vacuum heat treatment furnace; (2) after a set temperature is reached, introducing a gaseous silicon source to coat the surfaces of the graphite particles with a siliconlayer; and (3) after a set temperature is reached, introducing a gaseous carbon source to coat the surface of a silicon film with a carbon layer. The invention also discloses the negative electrode material of graphite surface-coated with the silicon/carbon double layers prepared by using the method. According to the preparation method of the negative electrode material, a silicon material can beuniformly distributed in the whole negative electrode material system, and the phenomenon of non-uniform expansion in the charging and discharging process is avoided. The negative electrode materialstructure provided by the invention is expected to have excellent rate capability, cycling stability and high specific capacity at the same time.
本发明提供了一种石墨表面硅/碳双层包覆的负极材料的制备方法，(1)将石墨颗粒置于真空热处理炉中；(2)到达设定温度后，通入气态硅源，使石墨颗粒表面包覆一层硅层；(3)到达设定温度后，通入气态碳源，使硅薄膜表面包覆一层碳层。本发明还公开了一种采用上述方法制备得到的石墨表面硅/碳双层包覆的负极材料。本发明中所述负极材料的制备方法可使硅材料非常均匀地分布于整个负极材料体系中，在充放电过程中不会产生膨胀不均匀现象。本发明中所述的负极材料结构可望同时具备优异的倍率特性、循环稳定性以及高的比容量。
Negative electrode material of graphite surface-coated with silicon/carbon double layers and preparation method thereof
一种石墨表面硅/碳双层包覆的负极材料及其制备方法
YUE ZHIHAO (author) / ZHOU LANG (author) / XU GUOJUN (author)
2020-11-13
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
/
B82Y
Bestimmter Gebrauch oder bestimmte Anwendung von Nanostrukturen
,
SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES
/
H01M
Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie
,
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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