Understanding the Redox Mechanism of Layered Transition Metal Oxide During Electrochemical Cycling in Sodium-Ion Batteries

From the perspective of the lithium resources situation on earth, it is very vital to develop sodium-ion batteries (SIB) as lithium-ion technologies alternatives. Delivering high capacity along with adequate capacity retaining is difficult in designing favorable cathode material for SIB. Among all of the positive electrode (cathode) materials for SIB, layered transition metal oxides (LTMO) with remarkable properties have attracted intensive interest. In this work, we intend to enhance the electrochemical behavior of O3 Na[Fe0.27Cu0.27Mn0.46]O2 (NFCM) in SIB with graphene oxide in reduced form (rGO), as the negative electrode (anode) material. X-ray diffraction spectrum confirms the presence of expected phase of LTMO. Electrochemical impedance spectroscopy (EIS), Galvano static charge–discharge (GCD), and Cyclic voltammetry (CV) are performed, and material delivers a excellent specific capacity value of 116 mAhg−1 with efficient capacity retention at the current rate of 1C.