Abstract
Lithium solid electrolytes can potentially address two key limitations of the organic electrolytes used in today’s lithium-ion batteries, namely, their flammability and limited electrochemical stability. However, achieving a Li+ conductivity in the solid state comparable to existing liquid electrolytes (>1 mS cm−1) is particularly challenging. In this work, we reveal a fundamental relationship between anion packing and ionic transport in fast Li-conducting materials and expose the desirable structural attributes of good Li-ion conductors. We find that an underlying body-centred cubic-like anion framework, which allows direct Li hops between adjacent tetrahedral sites, is most desirable for achieving high ionic conductivity, and that indeed this anion arrangement is present in several known fast Li-conducting materials and other fast ion conductors. These findings provide important insight towards the understanding of ionic transport in Li-ion conductors and serve as design principles for future discovery and design of improved electrolytes for Li-ion batteries.
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Acknowledgements
This work was supported by the Samsung Advanced Institute of Technology. Computational resources from the National Energy Research Scientific Computing Center (NERSC) and from the Extreme Science and Engineering Discovery Environment (XSEDE) are gratefully acknowledged.
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G.C., W.D.R. and Y.W. proposed the concept. Y.W. carried out the calculations and together with W.D.R. prepared the manuscript initially. W.D.R. conceived and implemented the structural matcher algorithm. All authors contributed to the discussions and revisions of the manuscript.
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Wang, Y., Richards, W., Ong, S. et al. Design principles for solid-state lithium superionic conductors. Nature Mater 14, 1026–1031 (2015). https://doi.org/10.1038/nmat4369
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DOI: https://doi.org/10.1038/nmat4369
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