Nd3+-doped Li3V2(PO4)3 cathode material with high rate capability for Li-ion batteries

A series of Nd3+-doped Li3NdxV2−x(PO4)3 (x = 0.00, 0.02, 0.05, 0.08 or 0.1) composites are synthesized by the rheological phase reaction method. The XRD results indicate that Nd3+ ions have been successfully merged into a lattice structure. Doped samples show good electrochemical performance in high discharge rate and long cycle. In the potential range of 3.0–4.3 V, Li3Nd0.08V1.92(PO4)3 exhibits an initial discharge capacity of 115.8 mAh/g at 0.2 C and retain 80.86% of capacity retention at 2 C in the 51st cycle. In addition, Li3Nd0.05V1.95(PO4)3 holds at 100.4 mAh/g after 80 cycles at 0.2 C with a capacity retention of 92.4%. Finally, the CV test proves that the potential polarization of Li3Nd0.08V1.92(PO4)3 decreased compared with the un-doped one.

Li3Nd0.08V1.92(PO4)3 delivers 111.3 mAh/g at 0.2 C, and a corresponding coulombic efficiency of 93.8%. After 50 weekly cycles, its discharge capacity still retains 90.0 mAh/g (80.86% of capacity retention) by increasing the rate from 0.2 C to 2 C.Figure optionsDownload as PowerPoint slide