Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 28, Pages 10847-10853Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00371c
Keywords
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Funding
- Converging Research Center Program [2013K000210]
- Center for Advanced Soft Electronics under the Global Frontier Research Program through the National Research Foundation - MEST of Korea [2011-0031630]
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A graphene-attached VS4 composite prepared by a simple hydrothermal method is studied in terms of its lithium reaction mechanism and high rate capability. The nanocomposite exhibits a good cycling stability and an impressive high-rate capability for lithium storage, delivering a comparable capacity of 630 and 314 mA h g(-1), even at high rates of 10 and 20 C (=10 and 20 A g(-1), or 10 and 20 mA cm(-2)), respectively. In addition, full-cell (LiMn2O4/VS4-graphene) test results also exhibited a good capacity retention. The mechanism of Li storage is systematically studied and a conversion reaction with an irreversible phase change during the initial discharge-charge process is proposed.
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