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- Title
Fabrication of SiO@Graphite@C@Al<sub>2</sub>O<sub>3</sub> as Anode Material for Lithium-Ion Batteries.
- Authors
Hou, Chunping; Yue, Zeyu; Zhai, Lidong; Sun, Hehang; Xie, Haidong; Lu, Hui; Wu, Jiandong; Wang, Xingwei; Hou, Jiao
- Abstract
In this study, SiO@graphite@C@Al2O3 (SiO@G@C@A) composites are synthesized by varying the content of Al2O3, and their morphology and structure and their electrochemical performance are investigated in detail. The results indicate that the SiO/G@C@A-2 composite exhibits a specific capacity of 977.1 mA h g−1 at a current density of 0.1 A g−1 with a coulombic efficiency of 71.15%. Even after 100 cycles at a current density of 0.5 A g−1, it retains a delithiated specific capacity of 640.7 mA h g−1 and a capacity retention rate of 73.56%. Moreover, when the current density is raised to 2 A g−1, it maintains a delithiated capacity of 568.4 mA h g−1 and a capacity retention rate of 58.51%. The excellent electrochemical performance is ascribed to the synergistic effect of different components. The inclusion of graphite enhances overall conductivity while mitigating the volume expansion of the SiO. The application of asphalt pyrolytic carbon as a coating effectively isolates the SiO from the electrolyte, further reducing volume expansion and enhancing conductivity. The introduction of Al2O3 can absorb trace amounts of hydrogen fluoride (HF) generated during charge and discharge processes. Additionally, it facilitates the formation of an AlF3 film on the particle surfaces, which hinders and decelerates electrolyte dissolution into the electrode. The prepared composites exhibit promising prospects as lithium-ion battery anode materials.
- Subjects
LITHIUM-ion batteries; ANODES; HYDROGEN fluoride; PYROLYTIC graphite; GRAPHITE; SUPERCAPACITOR electrodes; ELECTROLYTES
- Publication
Journal of Electronic Materials, 2024, Vol 53, Issue 7, p4261
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-024-11145-2