Structural behaviour and electrochemical study of V5+ based LiTi2 (PO4)3 solid electrolyte material for lithium-ion batteries

This study investigates the effect of adding pentavalent vanadium ions to LiTi2(PO4)3-based electrolytes to
enhance ionic conductivity. Vanadium-doped samples with compositions Li1-xTi2-xVx3 (x =0.05, 0.10, 0.15) were
prepared via a solid-state method. XRD analysis confirmed the formation of a pure rhombohedral phase, while
SEM showed particle sizes between 0.5 and 1 μm. Electrochemical impedance tests revealed the highest con
ductivity for x =0.15. The doped electrolytes exhibited better structural stability and higher conductivity at
temperatures from 150 ◦C to 350 ◦C compared to undoped samples. Doping widened the ion-conduction
pathway, resulting in a Li-ion conductivity of 0.82 ×10 4 S/cm at room temperature. These findings demon
strate that incorporating pentavalent cations like vanadium into LTP electrolytes is an effective approach for
improving performance, offering potential for advanced solid-state lithium batteries.