The widespread adoption of high-energy-density solid-state batteries (SSBs) requires cost-effective processing and the integration of solid electrolytes of about the same thickness as the polymer-membrane separators found in conventional lithium-ion batteries. In this Review, we critically discuss the current status of research on SSB processing as well as recent cost calculations, and compare SSB oxide electrolyte material and processing options in terms of performance parameters for thick versus thin ceramics. We identify as critical for future SSB design the need to capture the thermal processing budget and the stability of the phase of interest for oxide solid electrolytes, namely lithium phosphorus oxynitride, sodium superionic conductors, perovskites and garnets, in addition to the classic plots of Arrhenius lithium transport and the electrochemical stability window. Transitioning to SSB oxide electrolyte films with thicknesses close to the range for lithium-ion battery separators could provide ample opportunities for low-temperature ceramic manufacture and potential cost reduction.
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Unlocking the hidden chemical space in cubic-phase garnet solid electrolyte for efficient quasi-all-solid-state lithium batteries
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Researchers were supported in parts by Samsung Electronics, NGK Inc., the Swiss National Science Foundation (grant number BSSGI0_155986) and the National Science Foundation MRSEC Program (grant number DMR-1419807). M.B. acknowledges financial support from the US-Israel Fulbright Program, the Zuckerman Israeli Postdoctoral Scholar Program and the MIT-Technion Postdoctoral Fellowship. Y.Z. acknowledges financial support from the ExxonMobil-MIT Energy Initiative Fellowship. J.L.M.R. thanks the Thomas Lord Foundation for financial support.
The authors declare no competing interests.
Peer review information Nature Energy thanks Kiyoshi Kanamura, Richard Schmuch and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Balaish, M., Gonzalez-Rosillo, J.C., Kim, K.J. et al. Processing thin but robust electrolytes for solid-state batteries. Nat Energy 6, 227–239 (2021). https://doi.org/10.1038/s41560-020-00759-5
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