Abstract

The microstructures of nanocrystalline LiCoO 2 cathodes in lithium thin-film batteries resulting from high-temperature cycling have been characterized by transmission electron microscopy. Results show the evolution of the LiCoO 2 spinel phase from trigonal to cubic. This irreversible secondary phase is found homogeneously distributed in the LiCoO 2 thin film and contributes to capacity loss of thin-film batteries during cycling.

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