Bifunctional separator with a light-weight carbon-coating for dynamically and statically stable lithium-sulfur batteries

Sheng Heng Chung, Arumugam Manthiram

研究成果: Article同行評審

473 引文 斯高帕斯(Scopus)

摘要

Sulfur is appealing as a high-capacity cathode for rechargeable lithium batteries as it offers a high theoretical capacity of 1672 mA h g-1 and is abundant. However, the commercialization of Li-S batteries is hampered by fast capacity fade during both dynamic cell cycling and static cell resting. The poor electrochemical stability is due to polysulfide diffusion, leading to a short cycle life and severe self-discharge. Here, we present the design of a bifunctional separator with a light-weight carbon-coating that integrates the two necessary components already inside the cell: the conductive carbon and the separator. With no extra additives, this bifunctional carbon-coated separator allows the use of pure sulfur cathodes involving no complex composite synthesis process, provides a high initial discharge capacity of 1389 mA h g-1 with excellent dynamic stability, and facilitates a high reversible capacity of 828 mA h g-1 after 200 cycles. In addition, the static stability is evidenced by low self-discharge and excellent capacity retention after a 3 month rest period.

原文English
頁(從 - 到)5299-5306
頁數8
期刊Advanced Functional Materials
24
發行號33
DOIs
出版狀態Published - 2014 9月 3

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 生物材料
  • 凝聚態物理學
  • 電化學

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