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Enabling the high capacity of lithium-rich anti-fluorite lithium iron oxide by simultaneous anionic and cationic redox

Nature Energyvolume 2pages963971 (2017) | Download Citation

Abstract

Anionic redox reactions in cathodes of lithium-ion batteries are allowing opportunities to double or even triple the energy density. However, it is still challenging to develop a cathode, especially with Earth-abundant elements, that enables anionic redox activity for real-world applications, primarily due to limited strategies to intercept the oxygenates from further irreversible oxidation to O2 gas. Here we report simultaneous iron and oxygen redox activity in a Li-rich anti-fluorite Li5FeO4 electrode. During the removal of the first two Li ions, the oxidation potential of O2− is lowered to approximately 3.5 V versus Li+/Li0, at which potential the cationic oxidation occurs concurrently. These anionic and cationic redox reactions show high reversibility without any obvious O2 gas release. Moreover, this study provides an insightful guide to designing high-capacity cathodes with reversible oxygen redox activity by simply introducing oxygen ions that are exclusively coordinated by Li+.

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Acknowledgements

This work was supported by the Centre for Electrochemical Energy Science, an Energy Frontier Research Centre funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under award number DE-AC02–06CH11. Use of the Advanced Photon Source and the Centre for Nanoscale Materials, both Office of Science user facilities operated for DOE, Office of Science by Argonne National Laboratory, was supported by the US DOE under Contract No. DE-AC02-06CH11357. The authors acknowledge C.-K. Lin and X. Wang for preparing the Li5FeO4 powders and electrodes. L.L. and M.K.Y.C. thank E. Shirley and J. Vinson for the use of and guidance with the OCEAN code. The computing resources are supported by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the US Department of Energy under Contract DE-AC02-05CH11231, and Blues, a high-performance computing cluster operated by the Laboratory Computing Resource Center at Argonne National Laboratory.

Author information

Author notes

  1. Chun Zhan and Zhenpeng Yao contributed equally to this work.

Affiliations

  1. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL, USA

    • Chun Zhan
    • , Jun Lu
    • , Victor A. Maroni
    • , Eungje Lee
    • , Christopher Johnson
    • , Michael M. Thackeray
    •  & Khalil Amine
  2. Material Science and Engineering Department, Northwestern University, Evanston, IL, USA

    • Zhenpeng Yao
    •  & Chris Wolverton
  3. X-ray Science Division, Argonne National Laboratory, Argonne, IL, USA

    • Lu Ma
    • , Esen E. Alp
    • , Tianpin Wu
    •  & Yang Ren
  4. Centre for Nanoscale Materials, Argonne National Laboratory, Argonne, IL, USA

    • Liang Li
    • , Jianguo Wen
    •  & Maria K. Y. Chan

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Contributions

C.Z. and J.L. conceived the idea and design of the experiments. Z.Y. and C.W. performed the DFT simulations. L.M. and T.W. carried out the measurements and analysis of XAS. V.A.M. performed the fitting of Raman spectra. J.W performed the TEM imaging. L.L. and M.K.Y.C. performed the oxygen core-level spectrum simulations. E.L. and E.E.A performed the measurements and analysis of ex situ Mössbauer spectroscopy. Y.R. contributed to measurements of in situ and ex situ XRD. C.J. and M.M.T. contributed to discussions and interpretation of the data. The project was supervised by J.L. and K.A.

Competing interests

The authors declare no competing financial interests.

Corresponding authors

Correspondence to Jun Lu or Chris Wolverton or Khalil Amine.

Supplementary information

  1. Supplementary Information

    Supplementary Figure 1–8, Supplementary Table 1–2, Supplementary Notes, Supplementary References.

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DOI

https://doi.org/10.1038/s41560-017-0043-6