Structure and Performance of NaMnAlFeO (0.7 ≤ ≤ 1.0) Composite Materials for Sodium-Ion Batteries.

P2 and O3 structures are two important sodium manganese oxide phases for sodium-ion batteries; however, encounter Na-deficient and poor rate performance, respectively. Herein, a systematic study of NaMnAlFeO (0.7 ≤ ≤ 1.