A Post-Mortem Study of Stacked 16 Ah Graphite//LiFePO4 Pouch Cells Cycled at 5 °C

Resumen

Ni-doped VO₂(B) samples (Ni_xVO₂(B)) were fabricated by a facile one-step hydrothermal method. When evaluated as a cathode material for lithium ion batteries (LIBs), these Ni-doped VO₂(B) exhibited improved lithium storage performance as compared to the pure VO₂(B). In particular, when the doping amount is 3%, Ni_xVO₂(B) showed the highest lithium storage capacity, best cycling stability, smallest electrochemical reaction resistance, and largest lithium diffusion coefficient. For example, after 100 cycles at a current density of 32.4 mA/g, Ni_xVO₂(B) delivered a high specific discharge capacity of 163.0 mAh/g, much higher than that of the pure VO₂(B) sample (95.5 mAh/g). Therefore, Ni doping is an effective strategy for enhancing the lithium storage performance of VO₂(B).