A Search for Low-Irreversible Capacity and High-Reversible Capacity Positive Electrode Materials in the Li–Ni–Mn–Co Pseudoquaternary System

A comprehensive search for Li-ion battery positive electrode materials that can simultaneously exhibit low irreversible capacity loss (IRC) (∼10% or less) and high reversible capacity (>240 mAh/g) was performed in the Li–Ni–Mn–Co–O pseudoquaternary system. An array of high-capacity Li-rich layered oxides, most of which show an “oxygen release” plateau during the first charge, were synthesized with a wide range of Ni, Mn, and Co compositions, …