Dong Fei, Yang Bin, Zhang Xueqian, Yang Ziqiang, Wang Sen, Hou Zhiguo, Chen Pu
School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China.
School of Physics and Materials Engineering, Hefei Normal University, Hefei 230601, P. R. China.
ACS Appl Mater Interfaces. 2025 Jan 8;17(1):1332-1340. doi: 10.1021/acsami.4c18772. Epub 2024 Dec 23.
Tunnel-type-structure NaMnO has been extensively researched for cathode material in aqueous rechargeable sodium-ion battery owing to its high specific capacity (120 mA h g), large channels facilitating Na extraction/insertion, chemical and electrochemical stability in aqueous electrolytes, and low cost. However, the low average working potential (0.1 V versus standard hydrogen electrode, SHE) and no more than half of its available theoretical capacity within full batteries limit the practical application. Herein, we develop an Fe-based tunnel-type Na[MnFeTiSn]O cathode, delivering a high reversible specific capacity (95 mA h g) under a high working voltage (0.75 V versus SHE). A full battery, assembled with a NaTi(PO)@C anode, exhibits a high energy density of 80 W h kg (total mass of cathode and anode active materials) and a long cycle life with 84% capacity retention after 1000 cycles at 1 C.
