Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 31, Issue 5, Pages 1257-1261Publisher
KOREAN CHEMICAL SOC
DOI: 10.5012/bkcs.2010.31.5.1257
Keywords
Silicon; Silicon monoxide; Graphite; Anode; Lithium ion battery
Categories
Funding
- Korea Research Council for Industrial Science & Technology (ISTK)
- KERI [1001653]
- Ministry of Knowledge Economy (MKE) of Korea
- Korean Federation of Science and Technology Societies, Korea
- CECRI/CSIR, India
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The electrochemical performances of anode composites comprising elemental silicon (Si), silicon monoxide (SiO), and graphite (C) were investigated. The composite devoid of elemental silicon (SiO:C=1:1) and its carbon coated composite showed reduced capacity degradation with measured values of 606 and 584 mAh/g at the fiftieth cycle. The capacity retention nature when the composites were cycled followed the order of Si:SiO:C=3:1:4 < Si:SiO:C = 2:2:4 < SiO:C = :1 < SiO:C = 1:1 (carbon coated). A comparison of the capacity retention properties for the composites in terms of the silicon content showed that a reduced silicon content increased the stability of the composite electrodes. Even though the carbon-coated composite delivered low capacity during cycling compared to the other composites, its low capacity degradation made the anode a better choice for lithium ion batteries.
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