Single LiNi0.8Mn0.1Co0.1O2 particle electrochemistry of collision

Abstract An electrochemical collision method focusing on individual particles is applied to investigate the LiNi0.8Mn0.1Co0.1O2 for direct and accurate information about the ions migration process. For the first time, two types of unique current signals including trapezoid-like signals and wider-wave signals are observed with the increase of particle sizes, except for the acquainted spike-like signals with a sharp rise and a slow decay. The trapezoid-like signals started with a slow rise following by a steady platform and a slow decay, revealing an out-of-sync reaction at the beginning and a subsequent interface traversing and internal ion diffusion jointly controlled ions migration process in the particle. The wider-wave signals with a slower rise and a much slower decay are acquired from particles with the largest size, showing the slowest kinetics during the whole reaction process in the particle.