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Title: Expanded lithiation of titanium disulfide: Reaction kinetics of multi-step conversion reaction

Journal Article · · Nano Energy
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [5];  [4];  [6];  [7]; ORCiD logo [5]
  1. Northwestern Polytechnical Univ., Xi'an (People's Republic of China); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Northwestern Univ., Evanston, IL (United States); Harvard Univ., Cambridge, MA (United States)
  3. Northwestern Polytechnical Univ., Xi'an (People's Republic of China)
  4. Univ. of Houston, Houston, TX (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Univ. of Pennsylvania, Philadelphia, PA (United States)
  7. Northwestern Univ., Evanston, IL (United States)

Phase evolution during a thorough Li ion's insertion of electrode materials governs their battery performance during charge and discharge. Here we investigated the lithiation pathway of titanium disulfide using in situ TEM combined with synchrotron-based pair distribution function measurement and first-principles calculations. A 2D intercalation reaction proceeds along with a transition from van der Waals interaction between Ti-S slabs to the covalent bonding of S-Li-S, with no symmetry broken. Further lithiation triggers unconventionally multiple step conversion reactions as proved: LiTiS2→TiS→Ti2S→Ti. The conversion reaction pathway is also verified in fully discharged sample in coin-cell. Here, the expanded conversion chemistry is supposed to increase the capacity of TiS2 electrode and downgrade the cyclability, whereas the existence of intermediate phases shows the promise of improving the reversibility with a successful control of the state of charge.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Electrical Energy Storage (CEES); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1557705
Alternate ID(s):
OSTI ID: 1542525
Report Number(s):
BNL-211912-2019-JAAM
Journal Information:
Nano Energy, Vol. 63, Issue C; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Figures / Tables (5)