Статья

Excellent Cyclic and Rate Performances of SiO/C/Graphite Composites as Li-Ion Battery Anode

Long HuGuangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou, ChinaWenming XiaGuangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou, ChinaRenheng TangGuangdong Province Key Laboratory of Rare Earth Development and Application, Guangdong Research Institute of Rare Metals, Guangzhou, ChinaRenzong HuGuangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou, ChinaLiuzhang OuyangGuangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou, ChinaTai SunGuangdong Province Key Laboratory of Rare Earth Development and Application, Guangdong Research Institute of Rare Metals, Guangzhou, ChinaHui WangGuangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou, China

2020en

ABI

Аннотация

The SiO-based composites containing different carbon structures were prepared from asphalt and graphite by the milling, spray drying, and pyrolysis. In the obtained near-spherical SiO/C/Graphite particles, the refined amorphous SiO plates, which are coated with amorphous carbon, are aggregated with the binding of graphite sheets. The SiO/C/Graphite composites present a maximum initial charge capacity of 963 mAh g-1 at 100 mA g-1, excellent cyclic stability (~ 950 mAh g-1 over 100 cycles), and rate capability (670 mAh g-1 at 1000 mA g-1). This significant improvement of electrochemical performances in comparison with pristine SiO or SiO/C composite is attributed to the unique microstructure, in which both the graphite sheets and amorphous carbon coating could enhance the conductivity of SiO and buffer the volume change of SiO. The higher pyrolysis temperature causes the denser spherical microstructure and better cycle life. Our work demonstrates the potential of this SiO/C/Graphite composite for high-capacity anode of LIBs

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Идентификаторы

DOI: 10.3389/fchem.2020.00388

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar