Multicomponent P2-type Na2/3Mn0.67Ni0.22Cu0.05Ti0.02Al0.02O2 as an ultralong cycle-life and superior rate cathode for sodium-ion batteries.

• A novel multicomponent Na 2/3 Mn 0.67 Ni 0.22 Cu 0.05 Ti 0.02 Al 0.02 O 2 (NaMNCTAl) cathode was designed and prepared. • The as-synthesized NaMNCTAl exhibits both ultra-long cycle life and ultra-high rate capability. • Its reversible capacity is approximately 94.6 mAh g−1 at 1.0 C after 400 cycles. • At high rate of 10 C, it still presents a discharge capacity of 66 mAh g−1 after 900 cycles. In this work, we propose a novel material design method, and develop a multicomponent P2-type layered sodium oxide Na 2/3 Mn 0.67 Ni 0.22 Cu 0.05 Ti 0.02 Al 0.02 O 2 (NaMNCTAl). This multicomponent material can combine the advantages and functionalities of multiple different metal ions. In the designed NaMNCTAl, Cu element can provide new redox center, Ti element can enlarge interslab distance, Al element can reduce Jahn-Teller distortion. The synergy effect from such a multicomponent design can result in enhanced electrochemical kinetics and structural stability of NaMNCTAl. When used as cathode for sodium-ion batteries, the NaMNCTAl displays an unprecedented electrochemical performance of both ultra-long cycle life (87.8% capacity retention over 400 cycles at 1.0 C rate) and ultra-high rate capability (72.7 mAh g−1 at 10 C). This design strategy based on multicomponent can provide new avenues for designing advanced cathode materials with superior comprehensive performance. [ABSTRACT FROM AUTHOR]