Improved Electrochemical Properties of LiCoO₂ via Ni, Mn Co-doping from LiNi_0.8Co_0.1Mn_0.1O₂ for Rechargeable Lithium-ion Batteries

Abstract

A LiCoO₂/LiNi_0.8Co_0.1Mn_0.1O₂ composite was prepared by the combination of mechanical ball milling and heat treatment. The as-prepared LiCoO₂/LiNi_0.8Co_0.1Mn_0.1O₂ composite was characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray Spectroscopy. The LiCoO₂/LiNi_0.8Co_0.1Mn_0.1O₂ composite was utilized as cathode material for lithium-ion batteries. Compared with the milled LiCoO₂/LiNi_0.8Co_0.1Mn_0.1O₂ composite, the LiCoO₂/LiNi_0.8Co_0.1Mn_0.1O₂ composite after heat treatment exhibited superior performance, including in an increased coulombic efficiency, better capacity retention and enhanced rate capability. The present work demonstrated that Ni and Mn from LiNi_0.8Co_0.1Mn_0.1O₂ were co-doped for the LiCoO₂ during high temperature, resulting in improving the electrochemical properties of the LiCoO₂/LiNi_0.8Co_0.1Mn_0.1O₂ composite.