Study and Property Characterization of LiMn 2 O 4 Synthesized from Octahedral Mn 3 O 4

The structure of Mn 3 O 4 with an octahedron structure was similar to that of LiMn 2 O 4 , and the lithium manganate prepared with it had good electrochemical performance. During the preparation of octahedron Mn 3 O 4 , the effects of the pH regulator, temperature, and reaction pH on its morphology, specific surface area, and other properties were studied in this paper. LiMn 2 O 4 was prepared from Octahedron Mn 3 O 4 obtained by using better technology. The effects of calcination time and temperature on the physicochemical and electrochemical properties of LiMn 2 O 4 were studied. The research results indicated that the optimal synthesis conditions for Mn 3 O 4 were as follows: ammonia water was used as a pH regulator and complexing agent, reaction pH was 8, reaction temperature was 80 °C, reaction time was 12 h, and oxygen flow rate was 3 L∙min −1 . The LiMn 2 O 4 synthesized had a good octahedron morphology when the calcination temperature was 800 °C and the calcination time was 10 h. The first discharge-specific capacity was 121.9 mAh∙g −1 at a current density of 0.2 C, the discharge-specific capacity was 114.1 mAh∙g −1 after 100 cycles, and the capacity retention rate was 93.6%. Therefore, the lithium manganate prepared by using octahedron manganous oxide had good electrochemical reversibility and a good application prospect.