Removing the Intrinsic NiO Phase and Residual Lithium for High-Performance Nickel-Rich Materials

Layered Ni-rich materials for lithium-ion batteries exhibit high discharge capacities but degraded cyclability at the same time. The limited cycling stability originates from many aspects. One of critical factors is intrinsic insulating residual lithium compounds and rock-salt (NiO) phase on surface particles. In this work, LiNi 0.8 Co 0.1 Mn O 2 material etched with a trace amount boric acid used as model to demonstrate influences weak treatment regulations. After etching process, pH reduced 12.08 11.82, along lower cation mixing degree promoting electrochemical performances. Corresponding measurements that acids such H 3 BO can also etch NiO adjust particles pure layered structure. This process improves diffusion electron transport in interface between electrolyte, consequently leading better performance rate capability. study provides novel strategy comprehensive understanding modification regulation cathode batteries.