Thermally driven metastable solid-solution Li 0.5 FePO 4 in nanosized particles and its phase separation behaviors

Nanosized LiFePO 4 particles easily show a fast electrochemical response that can be achieved via a non-equilibrium pathway. To understand this intriguing phase transition behavior in nanosized LiFePO 4 particles, the metastable solid-solution phase was prepared by thermal treatment with a chemically delithiated nanosized Li 0.5 FePO 4 sample. Thermal treatment makes all the nanosized particles transform easily to the metastable solid-solution phase because of the large thermal energy while an electrochemical reaction does not. The phase separation behavior of the metastable solid-solution sample (Li 0.5 FePO 4 ) was investigated under various kinetic conditions to understand critical factors affecting the phase separation behavior of nanosized LiFePO 4 particles. The main findings in this study are as follows. The first finding is that the depressed phase separation behavior of the metastable phase may originate ...

Sunyoung Yoo and Byoungwoo Kang

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