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Title: All roads lead to Rome: Sodiation of different-stacked SnS2

Journal Article · · Nano Energy
 [1];  [2]; ORCiD logo [3];  [3];  [1];  [1];  [1];  [1];  [4];  [1];  [5]
  1. Shanghai University (China)
  2. Harvard University, Cambridge, MA (United States); University of Toronto, ON (Canada)
  3. Nanjing Technical University (China)
  4. Zhejiang University, Hangzhou (China)
  5. Harvard University, Cambridge, MA (United States); University of Toronto, ON (Canada); Vector Institute for Artificial Intelligence, Toronto (Canada); Canadian Institute for Advanced Research (CIFAR), Toronto (Canada)

Structural symmetry variations of two-dimensional materials may significantly affect their reaction process and kinetics with alkali ions. Here, SnS2 with different structural symmetry is used as the target to be comparatively investigated the phase transition pathway and ionic diffusion upon (de)sodiation in sodium-ion batteries using in situ transmission electron microscopy and ex situ x-ray photoelectron spectroscopy in combination with first-principles calculations. Different intermediate phases, AA1 NaSnS2 for trigonal SnS2 and AB1 NaSnS2 for hexagonal SnS2, are observed after sodium ions fully occupy all Oh sites. While the coming conversion/alloying reaction processes are relatively similar. The AA1/AB1 NaSnS2 sequentially transits to SnS, β-Sn and Na15Sn4 phases starting from Td sites of SnS2 being held. Reversible reactions occur among SnS, Na15Sn4 and Na2Sm (2<8) in following cycles. Here our works provide a deep understanding of the ionic diffusion and electrochemical reaction mechanisms for two-dimensional materials with different symmetry, and offer some guidance for the design of the high energy two-dimensional electrode materials.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Canada Foundation for Innovation; Government of Ontario; University of Toronto; National Natural Science Foundation of China (NSFC); Shanghai Institutions of Higher Learning; Shanghai Youth Top-Notch Talent Program
Grant/Contract Number:
SC0008688; 11702165; 51702207
OSTI ID:
1801861
Alternate ID(s):
OSTI ID: 1580536
Journal Information:
Nano Energy, Vol. 67, Issue C; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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