A novel Mn-based P2/tunnel/O3' tri-phase composite cathode with enhanced sodium storage properties.


College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China. [Email]


A novel P2/tunnel/O3' composite Na0.7Bi0.01MnO2 cathode is developed via the Na+-site modification of Bi3+ in layer structure Na0.7MnO2 for the first time. Superior electrochemical performance with a high capacity retention of ∼86.5% after 300 cycles at 2C is obtained. Moreover, the tri-phase structure can also serve as a model material, which intuitively evidences the environmental structural stability order: tunnel > P2 > O3'.

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