Enhancing the electrochemical performance of LiNi0.5Mn1.5O4 by V2O5-modification for Li-ion batteries

Abstract

The 2 wt.% V2O5-modified LiNi0.5Mn1.5O4 material has been prepared by a sol-gel method. The as-prepared samples were characterized by XRD and SEM. XRD result shows V2O5-modification process did not destroy the structure of spinel LNMO. The electrochemical results show that the 2 wt.% V2O5-modified LiNi0.5Mn1.5O4 sample exhibits a higher rate performance with discharge capacities of 133.3, 131.3, 129.8, 125.8, 120.1, 103.2, and 79.0 mAh g−1 at 0.2, 0.5, 1, 2, 3, 5, and 7 C, respectively. Moreover, the 2 wt.% V2O5-modified LiNi0.5Mn1.5O4 provides an enhanced discharge capacity of 116.2 mAh g−1 after 200 cycles at 1 C, having a capacity retention of 91.6%, high than that of pure LNMO with a discharge capacity of 103.0 mAh g−1 and capacity retention of 85.3%.