Phase evolution in single-crystalline LiFePO4 followed by in-situ scanning X-ray microscopy of a micrometer-sized battery

N. Ohmer, B. Fenk, D. Samuelis, C.-C. Chen, M. Weigand1, E. Goering1, G. Schütz1, and J. Maier

1Max Planck Institute for Intelligent Systems

We built a micrometer-sized all-solid-state thin film battery to follow in-situ the (de)lithiation mechanism of single crystalline LiFePO4 along the fast (010) orientation using scanning transmission X-ray microscopy. The starting point of phase transformation is dictated by the respective conductivities reflecting the defect chemical situation, while the growth pattern of both LFP and FP was clearly found to be dominated by elastic effects rather than being transport controlled.

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