Impedance, modulus and electrochemical studies of LiMn2- x - y Ce x Cu y O4 (0.01 ≤ x ≤ 0.05 and y = x) cathode materials

Abstract

In this task, the improvement on the electrochemical performances, particularly, on the cyclability and capacity retention of cathode material, LiMn2-x-yCexCuyO4 is reported using the dual doping method. This way of substitution is performed to investigate the effect of simultaneous substitution of mono and trivalent cations Ce+ and Cu3+ respectively for Mn3+/4+ into LiMn2O4 cathode by making the average oxidation state Mn to be around +3.5 and above. Thus, the synthesis of a new series of spinel LiMn2- x - y Ce x Cu y O4 (0.01 ≤ x ≤ 0.05 and y = x) cathode materials are performed. An investigation of the electrical and electrochemical properties of the synthesized materials is performed.