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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
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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Two‐Dimensional Arrays of Transition Metal Nitride Nanocrystals journal June 2019
Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials journal September 2019
Three‐Dimensional Hierarchical Constructs of MOF‐on‐Reduced Graphene Oxide for Lithium–Sulfur Batteries journal July 2019
Lab‐Scale In Situ X‐Ray Diffraction Technique for Different Battery Systems: Designs, Applications, and Perspectives journal May 2019
Metal-based nanostructured materials for advanced lithium–sulfur batteries journal January 2018
Rational design of two-dimensional nanomaterials for lithium–sulfur batteries journal January 2020
Oxygen-deficient titanium dioxide as a functional host for lithium–sulfur batteries journal January 2019
Sulfur encapsulation by MOF-derived CoS 2 embedded in carbon hosts for high-performance Li–S batteries journal January 2019
Porous Fe 3 O 4 Nanospheres as Effective Sulfur Hosts for Li-S Batteries journal January 2018