TY - JOUR
T1 - Al/Ti Co-doped Fe/Mn-based layered oxide for high-performance sodium-ion storage
AU - Zhao, Wenshuo
AU - Zhang, Yanzhe
AU - Wang, Yongli
AU - Wu, Tong
AU - Zhang, Yingying
AU - Sun, Jingjing
AU - Liu, Xiangrong
AU - Zhao, Yongjie
N1 - Publisher Copyright:
This journal is © The Royal Society of Chemistry, 2026.
PY - 2026
Y1 - 2026
N2 - Fe–Mn based layered transition metal oxides are compelling candidates for sodium-ion cathodes owing to their high specific capacity and cost-effectiveness. However, their practical application is hampered by inherent challenges, including the Jahn–Teller effect, lattice oxygen loss, and transition metal dissolution. In this study, an Al/Ti co-doped Na0.67Fe0.4Mn0.4Al0.1Ti0.1O2 (FM-AT) cathode is proposed and prepared. The introduction of Al/Ti effectively stabilizes the lattice oxygen structure by forming strong Al–O and Ti–O bonds, thereby suppressing oxygen redox activity and enhancing its reversibility. Furthermore, the stability of the transition metal layer is effectively enhanced, suppressing transition metal dissolution and the P2–OP4 phase transition associated with TMO2 layer slippage in deep charge states. The FM-AT demonstrated excellent cycling stability, with a capacity of 137.1 mAh g−1 at 20 mA g−1 and a capacity retention of 85.5% after 50 cycles (55.7% for the pristine FM cathode). Even after 200 cycles at 200 mA g−1, a capacity retention of 72.1% was achieved (versus 20.9% for the FM). This work offers a novel method for enhancing the structural stability of iron–manganese based electrodes and designing cost-effective, high-performance sodium ion cathodes.
AB - Fe–Mn based layered transition metal oxides are compelling candidates for sodium-ion cathodes owing to their high specific capacity and cost-effectiveness. However, their practical application is hampered by inherent challenges, including the Jahn–Teller effect, lattice oxygen loss, and transition metal dissolution. In this study, an Al/Ti co-doped Na0.67Fe0.4Mn0.4Al0.1Ti0.1O2 (FM-AT) cathode is proposed and prepared. The introduction of Al/Ti effectively stabilizes the lattice oxygen structure by forming strong Al–O and Ti–O bonds, thereby suppressing oxygen redox activity and enhancing its reversibility. Furthermore, the stability of the transition metal layer is effectively enhanced, suppressing transition metal dissolution and the P2–OP4 phase transition associated with TMO2 layer slippage in deep charge states. The FM-AT demonstrated excellent cycling stability, with a capacity of 137.1 mAh g−1 at 20 mA g−1 and a capacity retention of 85.5% after 50 cycles (55.7% for the pristine FM cathode). Even after 200 cycles at 200 mA g−1, a capacity retention of 72.1% was achieved (versus 20.9% for the FM). This work offers a novel method for enhancing the structural stability of iron–manganese based electrodes and designing cost-effective, high-performance sodium ion cathodes.
UR - https://www.scopus.com/pages/publications/105038950459
U2 - 10.1039/d6nr01237j
DO - 10.1039/d6nr01237j
M3 - Article
AN - SCOPUS:105038950459
SN - 2040-3364
JO - Nanoscale
JF - Nanoscale
ER -