In Situ Synthesis of VO₂ Embedded in Graphite/Si as a High Performance Anode for Lithium-Ion Batteries

Abstract:

To buffer the volume changes of silicon-based anode material and stabilize the solid-electrolyte-interface (SEI) layer formed in the electrolyte, a core-shell structure with VO₂ coating is newly designed. In this composite, the pitch modified spherical graphite serves as a core, and the Si particles are uniformly dispersed on its surface, then the VO₂ is synthesized in situ. The modified graphite/Si/VO₂ (Si@G@V) anode exhibits a reversible capacity of 1247 mAh g^-1 at the current density of 0.1 A g^-1 after 50 cycles, obtain a capacity retention of ~99%. The rate capability of ~320 mAh g^-1 at the current density of 10 A g^-1 is also obtained. The excellent cyclic stability and superior rate performance mainly attributed to the uniform dispersion of Si particles in the pitch modified spherical graphite, the core-shell structure of the material as well as the in-situ synthesis of VO₂. This simple synthesis process is of great significance to reduce the reunion and constrain the volume changes of silicon.

• Periodical: Materials Science Forum (Volume 999)
• Pages: 3-12
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.999.3
• Online since: June 2020
• Authors: Yi Yan, Wei Jia Peng, Rui Jun Fan, Guo Lin Cao, Hua Jun Guo*, Xiao Hui Shen, Zhan Yuan Tian
• Keywords: Lithium Ion Battery, Modified Graphite, Silicon, VO₂

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