Pillar Effect in Ni‐rich Cathode of Li‐Ion Battery by NH 3 Thermal Treatment

Abstract

Ni-rich layered LiNixMnyCozO2(NCM) materials are used in lithium-ion batteries because of their highcathode capacity. The high nickel content, however, usually leads to severe capacity fading and structuralcollapse after repeated charging and discharging. To mitigate these problems, we heat-treated NCM in anNH3atmosphere to form Ni2+pillars between Li layers. The Ni2+pillars improve the cycling stability ofNCM by alleviating degradation of the Li layer. This is a simple and effective method for improving thestability of Ni-rich NCM.