Modulating the Interlayer Spacing and Na/Vacancy Disordering of P2-NaMnO for Fast Diffusion and High-Rate Sodium Storage.

Modulating the interlayer spacing and Na/vacancy disordering can significantly affect the electrochemical behavior of P2-type cathode materials. In this work, we prepare a series of P2-NaMnO cathodes (NaNiMnMg O) with varying doping amounts of Mg and Ni to realize the maximization of the interlayer spacing within the experimental range and optimize the Na/vacancy ordering. Consequently, the as-prepared NaNiMnMgO illustrates an excellent rate performance of 193 mA h g discharge capacity at 0.