Journal
SOLID STATE IONICS
Volume 341, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2019.115040
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- German Federal Ministry of Economy and Technology (BMWi)
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Lithium thiophosphate glasses and glass ceramics are a promising class of electrolytes for all-solid-state lithium-ion batteries. Heat treatment of completely amorphous glasses often leads to a conductivity enhancement, which can be attributed either to the formation of highly conducting crystallites or to fast Li+ ion transport at the interface between amorphous phases and crystallites. Here, we demonstrate a novel conductivity enhancement mechanism in amorphous 0.33 LiI + 0.67 Li3PS4 glasses during a single annealing step at 180 degrees C. The combination of electrochemical impedance, Li-7 NMR, and positron-annihilation lifetime spectroscopy gives indication for an annealing-induced formation of monovacancies in the bulk amorphous phase, which act as stepping stones for fast Li+ ion transport. The maximum conductivity achieved after annealing was 6.5 mS.cm(-1), the highest value observed so far for amorphous thiophosphate-based electrolytes.
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