Preparation of hierarchical LiNi_xCo_yMn_zO₂ from solvothermal [Ni_xCo_yMn_z](OH)₂ via regulating the ratio of Ni, Co, and Mn and its excellent properties for lithium‐ion battery cathode

Abstract

The ternary-layered oxide (LiNi x Co y Mn z O 2) has become the most promising cathode material for lithium-ion batteries due to the advantages of higher discharge platform, better conductivity, and higher theoretical capacity. The [Ni x Co y Mn z ](OH) 2 with different ratios of nickel, cobalt, and manganese (NCM) was prepared by solvothermal method, and then ternary cathode material LiNi x Co y Mn z O 2 was obtained by mixing lithium and calcining. In this paper, ternary cathode materials with different ratios of NCM were prepared by the solvothermal method. The structure and morphology of the materials were analyzed by X-ray diffraction, scanning electron microscopy, and energydispersive spectroscopy. The effects of the ratio on the electrochemical properties of the materials were investigated by constant current charge and discharge test and electrochemical impedance spectroscopy test. The synthesized lithium-nickel-cobalt-manganese oxide belongs to the hexagonal system and has an α-NaFeO 2 layered structure, which is an R-3m space group. The NCM ternary cathode materials with different morphologies were obtained by changing the ratio of NCM. The sample with NCM ratio of 5:3:2 has a unique sheet-like spherical shape and has the best rate performance. K E Y W O R D S [Ni x Co y Mn z ](OH) 2 , proportional control, ternary cathode

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