Modeling Particle Size Effects on Phase Stability and Transition Pathways in Nanosized Olivine Cathode Particles

摘要

Recent experiments show that nanosized olivine LiFePO_4 has different phase transition and solubility behavior than that of larger cathode particles. The possibility of metastable or globally stable amorphous phase in nanosized LiFePO_4 particles during delithiation is considered in a diffuse-interface model. At a small enough particle size, a lithiated crystalline phase can undergo amorphization upon charging instead of transforming directly to the delithiated crystalline phase at nanoscale particle sizes.