Abstract
4 V-class oxide-based all-solid-state batteries, Li/Li2OHBr/LiCoO2, are prepared using ductile antiperovskite-structured Li2OHBr via room-temperature densification. The effects of anodic decomposition of Li2OHBr on the LiCoO2/Li2OHBr interfacial resistance and charge–discharge stabilities are investigated. Li2OHBr decomposes on LiCoO2 at 3.6 V vs. Li/Li+, and an irreversible charging capacity is observed in the first cycle. This anodic decomposition does not increase the resistance at the LiCoO2/Li2OHBr interface and in Li2OHBr. Transmission electron microscopy analysis shows an anodic-decomposed region of Li2OHBr with a thickness of ∼30 nm between the LiCoO2 and Li2OHBr phases. This thickness is almost consistent with the expected value assuming a one- to two-electron anodic decomposition reaction of Li2OHBr. The resulting solid electrolyte interphase will have acceptable Li+ conductivity and improves the adhesion of the interface. The surface coating of amorphous lithium phosphate stabilizes charge–discharge reactions probably by suppressing proton insertion into LiCoO2.
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