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Nano-Scale Complexions Facilitate Li Dendrite-Free Operation in LATP Solid-State Electrolyte

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Wengert,  Simon
Theory, Fritz Haber Institute, Max Planck Society;

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Reuter,  Karsten
Chair of Theoretical Chemistry and Catalysis Research Center Technical University of Munich;
Theory, Fritz Haber Institute, Max Planck Society;

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Scheurer,  Christoph
Chair of Theoretical Chemistry and Catalysis Research Center Technical University of Munich;
Theory, Fritz Haber Institute, Max Planck Society;

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Citation

Stegmaier, S., Schierholz, R., Povstugar, I., Barthel, J., Rittmeyer, S. P., Yu, S., et al. (2021). Nano-Scale Complexions Facilitate Li Dendrite-Free Operation in LATP Solid-State Electrolyte. Advanced Energy Materials, 11(26): 2100707. doi:10.1002/aenm.202100707.


Cite as: http://hdl.handle.net/21.11116/0000-0008-A1CD-B
Abstract
Dendrite formation and growth remains a major obstacle toward high-performance all solid-state batteries using Li metal anodes. The ceramic Li(1+x)Al(x)Ti(2−x)(PO4)3 (LATP) solid-state electrolyte shows a higher than expected stability against electrochemical decomposition despite a bulk electronic conductivity that exceeds a recently postulated threshold for dendrite-free operation. Here, transmission electron microscopy, atom probe tomography, and first-principles based simulations are combined to establish atomistic structural models of glass-amorphous LATP grain boundaries. These models reveal a nanometer-thin complexion layer that encapsulates the crystalline grains. The distinct composition of this complexion constitutes a sizable electronic impedance. Rather than fulfilling macroscopic bulk measures of ionic and electronic conduction, LATP might thus gain the capability to suppress dendrite nucleation by sufficient local separation of charge carriers at the nanoscale.