TY - JOUR
T1 - Heteroatom anchoring to enhance electrochemical reversibility for high-voltage P2-type oxide cathodes of sodium-ion batteries
AU - Liu, Kai
AU - Tan, Susheng
AU - Sun, Xiao Guang
AU - Zhang, Qingqing
AU - Li, Cheng
AU - Lyu, Hailong
AU - Zhang, Lianqi
AU - Thapaliya, Bishnu P.
AU - Dai, Sheng
N1 - Publisher Copyright:
© 2024
PY - 2024/9
Y1 - 2024/9
N2 - P2-type cathode has received extensive attention due to its faster Na+ diffusion and a high theoretical capacity in sodium-ion batteries (SIBs). However, undesirable phase transformations have induced dramatic capacity decay of SIBs during the cycling process. In this study, heteroatom anchoring through Cu/Mg dual doping is introduced into P2-type Na0.67Ni0.33Mn0.67O2 cathode to enhance high-voltage electrochemical reversibility and modulate interfacial Na+ kinetics. The as-prepared Na0.67Ni0.23Mg0.05Cu0.05Mn0.67O2 exhibits an outstanding capacity retention (83.4 % after 2000 cycles at 10 C) and rate performance (73 mAh g−1 at 10 C, accounting for 58.7 % of that at 0.1 C) over the voltage range of 2.5–4.4 V. Intensive explorations further manifest that the modified mechanism of dual-ion doping strategy is attributed to the synergistic coupling effect of a substantial change in Na occupancy distribution and an increase in oxygen vacancy buffer. Thus, the optimized cathode expedites Na+ diffusion and reduces detrimental phase transformation, which favors high-rate performance and long-term cycling stability. This study develops a route to rationally design high-voltage cathode materials for SIBs.
AB - P2-type cathode has received extensive attention due to its faster Na+ diffusion and a high theoretical capacity in sodium-ion batteries (SIBs). However, undesirable phase transformations have induced dramatic capacity decay of SIBs during the cycling process. In this study, heteroatom anchoring through Cu/Mg dual doping is introduced into P2-type Na0.67Ni0.33Mn0.67O2 cathode to enhance high-voltage electrochemical reversibility and modulate interfacial Na+ kinetics. The as-prepared Na0.67Ni0.23Mg0.05Cu0.05Mn0.67O2 exhibits an outstanding capacity retention (83.4 % after 2000 cycles at 10 C) and rate performance (73 mAh g−1 at 10 C, accounting for 58.7 % of that at 0.1 C) over the voltage range of 2.5–4.4 V. Intensive explorations further manifest that the modified mechanism of dual-ion doping strategy is attributed to the synergistic coupling effect of a substantial change in Na occupancy distribution and an increase in oxygen vacancy buffer. Thus, the optimized cathode expedites Na+ diffusion and reduces detrimental phase transformation, which favors high-rate performance and long-term cycling stability. This study develops a route to rationally design high-voltage cathode materials for SIBs.
KW - Cu/Mg dual doping
KW - High voltage
KW - Oxygen vacancy
KW - Phase transformation
KW - Sodium ion batteries
UR - http://www.scopus.com/inward/record.url?scp=85197092765&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2024.109925
DO - 10.1016/j.nanoen.2024.109925
M3 - Article
AN - SCOPUS:85197092765
SN - 2211-2855
VL - 128
JO - Nano Energy
JF - Nano Energy
M1 - 109925
ER -