Dynamic Hosts for High-Performance Li–S Batteries Studied by Cryogenic Transmission Electron Microscopy and in Situ X-ray Diffraction
Journal Article
·
· ACS Energy Letters
- Wuhan Univ. (China)
- Cornell Univ., Ithaca, NY (United States). Baker Lab.
- Rice Univ., Houston, TX (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Cornell Univ., Ithaca, NY (United States)
- Univ. of Louisiana, Lafayette, LA (United States)
Developing a high-performance sulfur host is central to the commercialization and general development of lithium–sulfur batteries. Here, for the first time, we propose the concept of dynamic hosts for lithium–sulfur batteries and elucidate the mechanism through which TiS2 acts in such a fashion, using in situ X-ray diffraction and cryogenic scanning transmission electron microscopy (cryo-STEM). A TiS2–S composite electrode delivered a reversible capacity of 1120 mAh g–1 at 0.3 C after 200 cycles with a capacity retention of 97.0% and capacities of 886 and 613 mAh g–1 at 1.0 C up to 200 and 1000 cycles, respectively. Finally, our results indicate that it is LixTiS2 (0 < x ≤ 1), rather than TiS2, that effectively traps polysulfides and catalytically decomposes Li2S.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Materials Center at Cornell (EMC2)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001086
- OSTI ID:
- 1566356
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 6 Vol. 3; ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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