Lithium storage behavior of MoO3–P2O5 glass as cathode material for Li-ion batteries

MoO 3 -P 2 O 5 glasses were prepared by a simple melt quenching method. XRD and DSC investigations confirmed the amorphous state of 60Mo-40P, 70Mo-30P and 75Mo-25P glass. Interestingly, HRTEM images revealed the inherent crystallization behavior in Mo enriched glass. The existing nanocrystals performed a synergetic effect with the glass matrix to relax the stress caused by Li ions insertion/extraction. As a result, 75Mo-25P glass with distinct nanocrystals showed excellent long cycling stability. The structural transition of MoO 3 -P 2 O 5 glass and the valence change of Mo ions during cycling were discussed. Furthermore, CV and EIS measurements were performed to elucidate the difference of redox reaction , electrons transport and ions diffusion in 75Mo-25P glass and crystalline MoO 3 . This study provides an avenue to exploit new cathode materials with long cycling life for Li-ion batteries.