Improved rate capability of lithium-ion batteries with Ag nanoparticles deposited onto silicon/carbon composite microspheres as an anode material
- Authors
- Kwon, Eunji; Lim, Hyung-Seok; Sun, Yang Kook; Suh, Kyung-Do
- Issue Date
- Apr-2013
- Publisher
- ELSEVIER
- Keywords
- Li-ion battery; Composite anodes; Ag deposition; Si/C composite; Rate capability
- Citation
- SOLID STATE IONICS, v.237, pp.28 - 33
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOLID STATE IONICS
- Volume
- 237
- Start Page
- 28
- End Page
- 33
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/26753
- DOI
- 10.1016/j.ssi.2013.02.008
- ISSN
- 0167-2738
- Abstract
- Ag-deposited silicon/carbon (Ag/Si/C) composite microspheres were synthesized and evaluated as an anode material for lithium-ion batteries (LIBs). The Si/poly(AN-co-TMSPM) composite microspheres were prepared through suspension polymerization and were decorated with Ag nanoparticles by a wet chemical method in an aqueous AgNO3 solution. Ag nanoparticles remained on the surface of the Si/carbon (Si/C) composite microspheres even after heat treatment at high temperatures. The Si/C and Ag/Si/C composite microspheres were characterized by. scanning electron microscopy, focused ion beam-scanning electron microscopy, and X-ray diffraction. The electrochemical performance of the Ag/Si/C composite electrode was compared to that of the Si/C composite electrodes using electrochemical impedance spectroscopy, constant current charging and discharging, and cycling performance at various cycling rates. The Ag/Si/C composite microspheres exhibited a higher specific capacity and better rate capability at the various current rates from C/10 to 5C than those of the Si/C composite electrode without Ag nanoparticles when they were used as the anode material in LIBs. These results suggest that the surface deposition with Ag nanoparticles contributes to the charge-transfer kinetics of the Si/C composite electrode.
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