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In Operando XRD and TXM Study on the Metastable Structure Change of NaNi 1/3 Fe 1/3 Mn 1/3 O 2 under Electrochemical Sodium-Ion Intercalation

In operando XRD and TXM-XANES approaches demonstrate that structure evolution in NaNi 1/3 Fe 1/3 Mn 1/3 O 2 during cycling follows a continuous change, and the formation of a nonequilibrium solid solution phase in the existence of two phases. Here, an O3' and P3' monoclinic phase occur, and redox couples of Ni 3+ /Ni 4+ and Fe 3+ /Fe 4+ are mainly responsible in the charge voltage range from 4.0 to 4.3 V.

36 MATERIALS SCIENCE↗