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