✦ LIBER ✦

Effects of carbon coating on the electrochemical properties of sulfur cathode for lithium/sulfur cell

✍ Scribed by Young-Jin Choi; Young-Dong Chung; Chang-Yong Baek; Ki-Won Kim; Hyo-Jun Ahn; Jou-Hyeon Ahn

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 879 KB
Volume: 184
Category: Article
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2008.02.053

No coin nor oath required. For personal study only.

✦ Synopsis

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 Å 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.

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