Synthesis and Electrochemical Performance of Spinel LiMn2O4‐x(SO4)x Cathode Materials

Abstract The spinel LiMn2O4‐x(SO4)x compound cathode materials were synthesized by solid‐state reaction of the calculated amounts of LiOH·H2O, MnO2 and MnSO4. The results of the electrochemical test demonstrated that these materials exhibited excellent electrochemical properties. The highest reversible capacity of these series of cathode materials was ∼ 120 mAh/g, and after 50 cycles, this reversible capacity was still around 116 mAh/g with nearly 100% reversible efficiency, which revealed that doped sulfate ion could improve the structural stability of spinel.