First-Principles Study of Lithium Cobalt Spinel Oxides: Correlating Structure and Electrochemistry

Soo Kim, Vinay I. Hegde, Zhenpeng Yao, Zhi Lu, Maximilian Amsler, Jiangang He, Shiqiang Hao, Jason R. Croy, Eungje Lee*, Michael M. Thackeray, Chris Wolverton

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Embedding a lithiated cobalt oxide spinel (Li2Co2O4, or LiCoO2) component or a nickel-substituted LiCo1-xNixO2 analogue in structurally integrated cathodes such as xLi2MnO3·(1-x)LiM′O2 (M′ = Ni/Co/Mn) has been recently proposed as an approach to advance the performance of lithium-ion batteries. Here, we first revisit the phase stability and electrochemical performance of LiCoO2 synthesized at different temperatures using density functional theory calculations. Consistent with previous studies, we find that the occurrence of low- and high-temperature structures (i.e., cubic lithiated spinel LT-LiCoO2; or Li2Co2O4 (Fd3m) vs trigonal-layered HT-LiCoO2 (R3m), respectively) can be explained by a small difference in the free energy between these two compounds. Additionally, the observed voltage profile of a Li/LiCoO2 cell for both cubic and trigonal phases of LiCoO2, as well as the migration barrier for lithium diffusion from an octahedral (Oh) site to a tetrahedral site (Td) in Fd3m LT-Li1-xCoO2, has been calculated to help understand the complex electrochemical charge/discharge processes. A search of LiCoxM1-xO2 lithiated spinel (M = Ni or Mn) structures and compositions is conducted to extend the exploration of the chemical space of Li-Co-Mn-Ni-O electrode materials. We predict a new lithiated spinel material, LiNi0.8125Co0.1875O2 (Fd3m), with a composition close to that of commercial, layered LiNi0.8Co0.15Al0.05O2, which may have the potential for exploitation in structurally integrated, layered spinel cathodes for next-generation lithium-ion batteries.

Original languageEnglish (US)
Pages (from-to)13479-13490
Number of pages12
JournalACS Applied Materials and Interfaces
Volume10
Issue number16
DOIs
StatePublished - Apr 25 2018

Keywords

  • lithium cobalt oxide
  • lithium-ion battery
  • materials discovery
  • migration barrier
  • overlithiated spinel
  • overpotential
  • structural search

ASJC Scopus subject areas

  • Materials Science(all)

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    Kim, S., Hegde, V. I., Yao, Z., Lu, Z., Amsler, M., He, J., Hao, S., Croy, J. R., Lee, E., Thackeray, M. M., & Wolverton, C. (2018). First-Principles Study of Lithium Cobalt Spinel Oxides: Correlating Structure and Electrochemistry. ACS Applied Materials and Interfaces, 10(16), 13479-13490. https://doi.org/10.1021/acsami.8b00394