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Dynamic Hosts for High-Performance Li–S Batteries Studied by Cryogenic Transmission Electron Microscopy and in Situ X-ray Diffraction AITranslate

XiaoChen Liu; Yao Yang; Jingjie Wu; Miao Liu; Sophia P. Zhou; Barnaby D. A. Levin; XiaoDong Zhou; Hengjiang Cong; David A. Muller; Pulickel M. Ajayan; Héctor D. Abruña; FuSheng Ke;
Wuhan University; Cornell University; Rice University; Lawrence Berkeley National Laboratory; Wuhan University; Cornell University; University of Louisiana at Lafayette; Wuhan University; Cornell University; Rice University; Cornell University; Wuhan University
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Publisher: ACS
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Abstract AITranslate

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. Our results indicate that it is LixTiS2 (0 < x ≤ 1), rather than TiS2, that effectively traps polysulfides and catalytically decomposes Li2S.

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DOI：https://doi.org/10.1021/acsenergylett.8b00561

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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. Our results indicate that it is LixTiS2 (0 < x ≤ 1), rather than TiS2, that effectively traps polysulfides and catalytically decomposes Li2S.

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GB/T 7714-2015 [1] XiaoChen Liu, Yao Yang, Jingjie Wu, et al. ACS Energy Letters, 2018(3). DOI:10.1021/acsenergylett.8b00561.
MLA [1] XiaoChen Liu, et al., ACS Energy Letters, no. 3, 2018, https://doi.org/10.1021/acsenergylett.8b00561.
APA [1] XiaoChen Liu, Yao Yang, Jingjie Wu, Miao Liu, Sophia P. Zhou, Barnaby D. A. Levin, XiaoDong Zhou, Hengjiang Cong, David A. Muller, Pulickel M. Ajayan, Héctor D. Abruña, & FuSheng Ke. (2018). ACS Energy Letters(3). https://doi.org/10.1021/acsenergylett.8b00561
IEEE [1] XiaoChen Liu, Yao Yang, Jingjie Wu, Miao Liu, Sophia P. Zhou, Barnaby D. A. Levin, XiaoDong Zhou, Hengjiang Cong, David A. Muller, Pulickel M. Ajayan, Héctor D. Abruña, and FuSheng Ke, ACS Energy Letters, no. 3, 2018, doi: 10.1021/acsenergylett.8b00561.