NbO₂ a Highly Stable, Ultrafast Anode Material for Li- and Na-Ion Batteries

Abstract

Anode materials with fast charging capabilities and stability are critical for realizing next-generation Li-ion batteries (LIBs) and Na-ion batteries (SIBs). The present work employs a simple synthetic strategy to obtain NbO 2 and studies its applications as an anode for LIB and SIB. In the case of the LIB, it exhibited a specific capacity of 344 mAh g −1 at 100 mA g −1 . It also demonstrated remarkable stability over 1000 cycles, with 92% capacity retention. Additionally, it showed a unique fast charging capability, which takes 30 s to reach a specific capacity of 83 mAh g −1 . For the SIB, NbO 2 exhibited a specific capacity of 244 mAh g −1 at 50 mA g −1 and showed 70% capacity retention after 500 cycles. Furthermore, detailed density functional theory reveals that various factors like bulk and surface charging processes, lower ion diffusion energy barriers, and superior electronic conductivity of NbO 2 are responsible for the observed battery performances.

Intercalating Elemental Se8 Rings and Cs+ Ions by Layered Selenidostannate: A Semiconductive Material for High-Energy Li-Ion Battery Anodes

“…Among them, rechargeable lithium-ion batteries (LIBs), hybrid electric vehicles, and smart grids, etc. are widely used. − …”

3R-NbS2 as a highly stable anode for sodium-ion batteries

“…In this context, Nb-based anode materials have recently garnered significant attention due to their enhanced stability towards Li + and Na + insertion. 12–14 Despite their exceptional stability, there are few reports on Nb-oxide or sulfide-based anodes, possibly due to difficulties associated with synthesizing pure phases of the materials. Herein, by employing a simple synthetic approach, we have obtained highly crystalline pure-phase 3R-NbS 2 through the decomposition of the niobium hexadecylamine (Nb–HDA) complex at high temperatures in the presence of H 2 S gas.…”