Interface-rich mixed P2 + T phase Na x Co 0.1 Mn 0.9 O 2 (0.44 ≤ x ≤ 0.7) toward fast and high capacity sodium storage

This work reports a novel design of mixed P2 + T phase Na x Co 0.1 Mn 0.9 O 2 for high performance sodium storage, whereby the T phase offers fast Na ion diffusivity and excellent structural stability, and the P2–T phase interface offers additional channels and extra sites for charge transfer and charge storage.