| Autor: |
Yan, Yi, Peng, Wei Jia, Fan, Rui Jun, Cao, Guo Lin, Guo, Hua Jun, Shen, Xiao Hui, Tian, Zhan Yuan |
| Zdroj: |
Materials Science Forum; June 2020, Vol. 999 Issue: 1 p3-12, 10p |
| Abstrakt: |
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. |
| Databáze: |
Supplemental Index |
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