SYNTHESIS AND ELECTROCHEMICAL CHARACTERIZATION OF LITHIUM-RICH LAYERED Li[Li0.2Mn0.54Ni0.13Co0.13]O2 CATHODE MATERIAL FOR LITHIUM ION BATTERIES

With the rapid development of the hybrid electric vehicles (HEVs) and electric vehicles(EVs), the demands for lithium-ion batteries with higher energy density become veryimportant. One way to hit this target is to find better positive electrode materials [1]. In recentyears, a Li-rich layered solid solution system Li2MnO3–LiMO2 (M = Ni, Co, Mn, etc.) hasattracted attention for its higher specific capacity (250 mAhg-1), lower cost, higher safety andenvironmental friendliness comparing to the commercial cathode materials [2,3].Unsatisfactorily, its poor diffusion coefficient and electronic conductivity result in the poorrate capacity and cycle property [4].Rare Earth Elements (REEs) such as ruthenium and yttrium can partially substitute Mn andNi to reduce the cation mixing and have been proved to stabilize the layer structure andimprove the initial columbic efficiency of Li-rich and Li[Ni1/3Mn1/3Co1/3]O2 cathodematerials [5].In this paper, structure and electrochemical performance of Li-rich layered cathode materialLi[Li0.2Mn0.54Ni0.13Co0.13]O2 has been investigated.