期刊
JOURNAL OF POWER SOURCES
卷 184, 期 2, 页码 548-552出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2008.02.053
关键词
Lithium/sulfur cell; Sulfur cathode; Carbon coating; Lithium secondary batteries
资金
- National IT Industry Promotion Agency (NIPA), Republic of Korea [C1090-0801-0023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [핵C6B1307] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Carbon-coated sulfur cathodes were prepared by sputtering method and electrochemical properties of lithium/sulfur cells were investigated. As a result of charge/discharge test, sulfur cathode having carbon layer of 180 angstrom showed the highest capacity of 1178 mA hg(-1) at first discharge. Moreover, discharge capacity showed about 500 mA hg(-1) until 50th cycle, which is two times larger than that of no-coated sulfur cathode. This capacity increase could be considered due to the decrease of polysulfides dissolution and the enhancement of electrical contact by surface carbon layer. The changes of sulfur cathode during discharge process were investigated by SEM observation, XRD and DSC measurements. From these results, a discharge reaction mechanism of lithium/carbon-coated sulfur cell was suggested. (C) 2008 Elsevier B.V. All rights reserved.
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