Superionic diffusion through frustrated energy landscape
(2017) Science — (2017)
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- Abstract
- Solid-state materials with extremely high ionic diffusion are necessary to many technologies including all-solid-state Li-ion batteries. In this work, we demonstrate through experimental characterization and theoretical analysis that LiTi2(PS4)3 or LTPS shows exceptional Li-ion diffusion, an order of magnitude higher than current state-of-the-art superionic conductors. We propose a rationalization to this behavior by the frustrated energy landscape experienced by lithium ions in the LTPS framework. LTPS shows a unique crystal structure with no regular tetrahedral or octahedral sites for lithium to favorably occupy. This leads to a smooth energy landscape combining small energy barriers with numerous diffusion paths. This energy landscape is closer to a liquid than typical crystalline solids and is at the root of the exceptional diffusion behavior in LTPS. The concept of a crystalline framework with frustrated energy landscape offers an entirely new design principle to guide the search of future high performance superionic conductors.
- Affiliations
SST-IMCN MOST
Citations
Di Stefano D., Miglio A., Robeyns, K., Filinchuk, Y., Lechartier M., Senyshyn A., Ishida H., Spannenberger S., Roling B., & Hautier, G. (2017). Superionic diffusion through frustrated energy landscape. Science. Submitted. https://hdl.handle.net/2078.5/22087 (Original work published 2017)