Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 34, Issue 5, Pages 1435-1440Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.5012/bkcs.2013.34.5.1435
Keywords
Li secondary battery; Si/C composite; Carbon matrix; Silicon
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Funding
- Basic Science Research Program (NRF) [2012-0002775]
- Education and Research Promotion Program of KOREATECH
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To investigate the influence of the carbon matrix on the electrochemical performance of Si/C composites, four types of Si/C composites were prepared using graphite, petroleum coke, pitch and sucrose as carbon precursors. A ball mill was used to prepare Si/C blends from graphite and petroleum coke, whereas a dispersion technique was used to fabricate Si/C composites where Si was embedded in disordered carbon matrix derived from pitch or sucrose. The Si/pitch-based carbon composite showed superior Si utilization (96% in the first cycle) and excellent cycle retention (70% after 40 cycles), which was attributed to the effective encapsulation of Si and the buffering effect of the surrounding carbon matrix on the silicon particles.
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