Comparative Investigation of 0.5Li2MnO3•0.5LiNi0.5Co0.2Mn0.3O2 Cathode Materials Synthesized by Using Different Lithium Sources

Lithium-rich manganese-based cathode materials has been attracted enormous interests as one of the most promising candidates of cathode materials for next-generation lithium ion batteries because of its high theoretic capacity and low cost. In this study, 0.5Li(2)MnO(3)center dot 0.5LiNi(0.)(5)Co(0)(.)(2)Mn(0)(.3)O(2) materials are synthesized through a solid-state reaction by using different lithium sources, and the synthesis process and the reaction mechanism are investigated in detail. The morphology, structure, and electrochemical performances of the material synthesized by using LiOH center dot H2O, Li2CO3, and CH3COOLi center dot 2H(2)O have been analyzed by using Thermo gravimetric analysis (TGA), X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements. The 0.5Li(2)MnO(3)center dot 0.5LiNi(0)(.)(5)Co(0)(.)(2)Mn(0)(.3)O(2) material prepared by using LiOH center dot H2O displays uniform morphology with nano particle and stable layer structure so that it suppresses the first cycle irreversible reaction and structure transfer, and it delivers the best electrochemical performance. The results indicate that LiOH center dot H2O is the best choice for the synthesis of the 0.5Li(2)MnO(3)center dot 0.5LiNi(0)(.)(5)Co(0)(.)(2)Mn(0)(.3)O(2) material.