Revealing High Na-Content P2-Type Layered Oxides as Advanced Sodium-Ion Cathodes.

ABSTRACT: Layered Na-based oxides with the general composition of NaxTMO2 (TM: transition metal) have attracted significant attention for their high compositional diversity that provides tunable electrochemical performance for electrodes in sodium-ion batteries. The various compositions bring forward complex structural chemistry that is decisive for the layered stacking structure, Na-ion conductivity, and the redox activity, potentially promising new avenues in functional material properties. In this work, we have explored the maximum Na content in P2-type layered oxides and discovered that the high-content Na in the host enhances the structural stability; moreover, it promotes the oxidation of low-valent cations to their high oxidation states (in this case Ni2+). This can be rationalized by the inc

SUBMITTER: Zhao C 

PROVIDER: S-EPMC7252945 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature