A new 3-D open-framework Li-rich vanadoborate and its high ionic conductivity after transforming into glasses.

A new 3-D open-framework Li-rich vanadoborate Li[VBOH]·28HO (1) has been successfully synthesized under hydrothermal conditions. The framework of this compound is constructed by the connection of [VBOH] clusters linked through hydrogen bonds and the charge is compensated by disordered Li ions. This compound can undergo a phase transition from the crystalline phase to the glassy phase at 220 °C. Interestingly, after transforming into the glass phase, this material exhibits a high Li ionic conductivity of 1.77 × 10 S cm at 400 °C and the activation energy of lithium ion transport is 0.48 eV.