Study on the Effect of Coprecipitation Conditions on the Growth and Agglomeration of Ni0.8Co0.1Mn0.1(OH)2 Particles

Abstract

Morphology and size of ternary precursors directly influence the electrochemical performance of the final cathode materials. Insights into the growth and agglomeration mechanisms of primary particles are crucial for enhancing the precursor performance. This work aims to examine the effects of ammonia concentration, pH values, and stirring speed on the growth, agglomeration, and characteristics of Ni_0.8Co_0.1Mn_0.1(OH)₂ primary particles prepared by the coprecipitation method. The {010} crystal family exposed on the surface of secondary particles heavily influences the growth of primary particles. Primary particle size increases with higher ammonia concentration, lower pH, and stirring speed. Higher ammonia concentrations lead to larger secondary particles with a narrower size span and tighter agglomeration. An increased pH value leads to a decreased size, broadened size span, and looser agglomeration of secondary particles. The average particle size decreases, and the impact on primary particle agglomeration tightness is limited by increased stirring speed.