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First-Principles Study of Spinel MgTiS2 as a Cathode Material

Journal Article · · Chemistry of Materials

Spinel intercalation hosts are well known to to facilitate high rate capability and high voltage Li-ion batteries. A recent experimental study has shown that Mg can reversibly intercalate in spinel TiS2, demonstrating the viability of Li intercalation host crystal structures for Mg-ion batteries. We report on a first-principles statistical mechanics study of Mg insertion into spinel TiS2, accounting for occupancy on both octahedrally and tetrahedrally coordinated interstitial sites. In contrast to Li-containing spinels, we predict mixed octahedral and tetrahedral site occupancy at nondilute Mg concentrations consistent with the recent experimental study of Sun et al. The onset of mixed occupancy is correlated with an increase in the spinel volume upon Mg insertion, which is more pronounced in MgxTiS2 than in its Li counterpart. Lastly, the results in this study suggest that the degree of mixed occupancy could be controlled through the volume of the host with addition of electrochemically inactive species.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1480081
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 7 Vol. 30; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Interplay between Composition, Electronic Structure, Disorder, and Doping due to Dual Sublattice Mixing in Nonequilibrium Synthesis of ZnSnN 2 :O journal January 2019
MgSc 2 Se 4 —A Magnesium Solid Ionic Conductor for All‐Solid‐State Mg Batteries? journal April 2019
Machine-learning the configurational energy of multicomponent crystalline solids journal November 2018
Understanding intercalation compounds for sodium-ion batteries and beyond
  • Kaufman, Jonas L.; Vinckevičiūtė, Julija; Krishna Kolli, Sanjeev
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2152 https://doi.org/10.1098/rsta.2019.0020
journal July 2019

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