Title: On the irreversible sodiation of tin disulfide

Journal Article · · Nano Energy
 [1];  [2]; ORCiD logo [3];  [4];  [5];  [3];  [4];  [6];  [7]
  1. Jiangsu Univ. of Science and Technology, Zhenjiang (China); Chinese Academy of Sciences (CAS), Beijing (China). National Lab. for Condensed Matter Physics, Inst. of Physics; Southeast Univ., Nanjing (China)
  2. Harvard Univ., Cambridge, MA (United States); Univ. of Toronto, ON (Canada)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  4. Wuhan Univ. of Technology (China). State Key Lab. of Advanced Technology for Materials Synthesis and Processing
  5. Northwestern Polytechnical Univ., Xi'an (China). State Key Lab. of Solidification Processing
  6. Southeast Univ., Nanjing (China)
  7. Chinese Academy of Sciences (CAS), Beijing (China). National Lab. for Condensed Matter Physics, Inst. of Physics
+ Show Author Affiliations

Tin disulfide is considered as a promising electrode material for sodium-ion batteries because of its two-dimensional layered structural characteristics allowing the intercalation of Na ions. Understanding the underlying reaction mechanisms and the decisive step of the reaction reversibility is critical for its applications. Herein, we investigate the sodiation and desodiation processes of SnS2 by employing in situ transmission electron microscopy (TEM). After the initial intercalation reaction, a rock-salt NaySnS2 phase with disordering Na and Sn cations is observed, followed with a conversion reaction and an alloying reaction. Additionally, the disordering reaction occurs along <1-10> direction of pristine SnS2 phase which is correlated with local bonding rearrangements induced by the exchange of Sn and Na cations. In-situ TEM studies and first-principles calculations indicate that the original 2D SnS2 structure could not be recovered during desodiation. Instead, the disordered NaySnS2 phase is finally formed, which indicates that the irreversible disordering transition is the determining step of irreversible cycling. This work probes the structural evolution of sodiation, providing a fundamental understanding of the electrochemical properties of metal sulfides and inspiring rational designs of high performance electrodes for sodium-ion batteries.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Key R&D Program of China; National Natural Science Foundation of China (NNSFC); Strategic Priority Research Program; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0019300
OSTI ID:
1773110
Report Number(s):
BNL-221216-2021-JAAM
Journal Information:
Nano Energy, Journal Name: Nano Energy Vol. 79; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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25 ENERGY STORAGE
In situ transmission electron microscopy
Phase transition
Sodiation reaction
Tin disulfide