S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Sn-Carbon Core-Shell Powder for Anode in Lithium Secondary Batteries
- Jung, Yoon Seok; Lee, Kyu T.; Ryu, Ji Heon; Im, Dongmin; Oh, Seung M.
- Issue Date
- Electrochemical Society
- J. Electrochem. Soc., 152, A1452 (2005)
- Spherical Sn-carbon core-shell powder was synthesized through a resorcinol-formaldehyde (RF) microemulsion polymerization
performed in the presence of hydrophobized Sn nanoparticles. The Sn-carbon core-shell structure was found to greatly enhance the
cycle life compared to the mixture of Sn and spherical carbon when evaluated as the anode in lithium-ion batteries. A core-shell
powder containing 20 wt % Sn showed 69% capacity retention at the 40th cycle when cycled between 0 and 2.0 V (vs Li/Li+) at
a constant current of 40 mA g−1. The mixture of 20 wt % Sn nanopowder and 80 wt % spherical carbon powder exhibited only
10% capacity retention in the same test condition. It is believed that the improved cyclability achieved with the core-shell powder
is largely attributed to the inhibition of aggregation between Sn nanoparticles. The marginal polarization due to an intimate
electrical contact made between Sn core and carbon shell is an additional advantageous feature achieved with this electrode.
© 2005 The Electrochemical Society.
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