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Author

Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Synthesis and morphological, electrochemical characterization of Sn92Co8 nanoalloys for anode materials in Li secondary batteries

Cited 31 times inthomson ciCited 33 times inthomson ci
Title
Synthesis and morphological, electrochemical characterization of Sn92Co8 nanoalloys for anode materials in Li secondary batteries
Author
Kim, HyunjungCho, Jaephil
Keywords
Amorphous carbon layers; Electrochemical characterization; Li secondary batteries; Nanoalloys
Issue Date
2007
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.154, no.5, pp.A462 - A466
Abstract
Uniformly distributed carbon-coated Sn92 Co8 nanoalloys with a particle size of 50 and 10 nm were prepared using a butyllithium and naphthalide solution at 500 and 700°C, respectively. The samples annealed at 500°C were covered with an amorphous carbon layer with a thickness of about 40 nm, but its thickness was shrunk to 8 nm when annealed at 700°C. The first charge capacity increased with increasing annealing temperature and exhibited 380 and 662 mAhg at 600 and 700°C, respectively. This is due to enhanced ordering of the carbon layer structure and full decomposition of the butyl ligands that limited Li-ion intercalation/deintercalation. The capacity retention of the nanoalloys annealed at 500 and 700°C was 76 and 54% after 30 cycles at a rate of 0.3 C (=210 mAg), while that of bulk Sn92 Co8 alloy was 15%. Much improved capacity retention of the carbon-coated nanoalloys is associated with the thicker carbon layer on the particle surface that acts as a more effective buffer layer for volume expansion during lithium alloying/dealloying than that of the bulk alloy.
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DOI
http://dx.doi.org/10.1149/1.2714305
ISSN
0013-4651
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ECHE_Journal Papers

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