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The role of grain boundaries in solid-state Li-metal batteries

Materials Futures 2023年第1期2卷 104-120页

作者： emily milan Mauro Pasta Department of Materials University of OxfordOxford OX13PHUnited Kingdom The Faraday Institution Didcot OX110RAUnited Kingdom

Despite the potential advantages promised by solid-state batteries,the success of solid-state electrolytes has not yet been fully realised.This is due in part to the lower ionic conductivity of solid electrolytes.In many solid superionic conductors,grain boundaries are found to be ionically resistive and hence contribute to this lower ionic conductivity.Additionally,in spite of the hope that solid electrolytes would inhibit lithium filaments,in most scenarios their growth is still observed,and in some polycrystalline systems this is suggested to occur along grain boundaries.It is apparent that grain boundaries affect the performance of solid-state electrolytes,however a deeper understanding is lacking.In this perspective,the current theories relating to grain boundaries in solid-state electrolytes are explored,as well as addressing some of the challenges which arise when trying to investigate their role.Glasses are presented as a possible solution to reduce the effect of grain boundaries in electrolytes.Future research directions are suggested which will aid in both understanding the role of grain boundaries,and diminishing their contribution in cases where they are detrimental.

关键词： solid electrolytes grain boundaries lithium growth glasses

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