Si-Cu/carbon composites with a core-shell structure for Li-ion secondary battery

Authors

Yong-Mook Kang, Kongju National University
Min Park, University of WollongongFollow
Jai-Young Lee, Korea Advanced Institute of Science and Technology, Korea
Hua-Kun Liu, University of WollongongFollow

RIS ID

22467

Publication Details

Kang, Y, Park, M, Lee, J & Liu, HK (2007), Si-Cu/carbon composites with a core-shell structure for Li-ion secondary battery, Carbon, 45(10), pp. 1928-1933.

Abstract

SiCu/carbon composites with a carbon core and a SiCu composite shell have been synthesized by two-step mechanical fusion process. Large amount of pores around composite particles as well as the bridging disordered carbon layer between SiCu composite and carbon was the structural advantage of SiCu/carbon composite, which could prevent the electrochemical degradation induced by enormous volume changes during Li⁺ insertion or extraction. With these structural characteristics, the cyclic property of SiCu/carbon composite was greatly improved compared to Si. A phase-controlled shell (SiCu composite) acted as another advantage for this SiCu/carbon composite, as it rendered not only good ductility for accommodating the volume expansion, but also enhanced kinetics.