Premium
Magnetic Properties and Environmental Temperature Effects on Battery Performance of Na 0.67 Mn 0.5 Fe 0.5 O 2
Author(s) -
Altin Serdar,
Bayri Ali,
Altin Emine,
Oz Erdinc,
Yasar Sedat,
Altundağ Sebahat,
Harfouche Messaoud,
Avci Sevda
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202001130
Subject(s) - fourier transform infrared spectroscopy , analytical chemistry (journal) , scanning electron microscope , ferrimagnetism , x ray absorption spectroscopy , materials science , electrochemistry , spectroscopy , ion , absorption spectroscopy , chemistry , chemical engineering , electrode , magnetization , physics , organic chemistry , chromatography , quantum mechanics , magnetic field , engineering , composite material
Herein, a modified solid state synthesis of Na 0.67 Mn 0.5 Fe 0.5 O 2 and the results of a detailed investigation of the structural and magnetic properties via Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), X‐ray absorption spectroscopy (XAS), scanning electron microscopy (SEM), and energy dispersive X‐ray (EDX) analysis are reported. The magnetic properties of Na 0.67 Mn 0.5 Fe 0.5 O 2 do not fit the Curie–Weiss law and a model regarding the spin configuration of the Mn and Fe ions and a possible ferrimagnetic order is suggested. Electrochemical measurements and ex situ structural analysis of the cathode material confirm the reversible structural transitions for the cells charged up to 4.0 V. Environmental temperature–dependent electrochemical measurements reveal a strong temperature dependence of both, the initial capacity and the capacity retention. Ex situ SEM, FTIR, and XRD studies on the battery membrane verify the formation of a Na 2 CO 3 phase on the membrane, which blocks the Na ion diffusion through membrane pores and is responsible for the capacity fade for this compound.