High-Rate Capability of Lithium-Rich Layered Li_1.2Ni_0.18Mn_0.59Co_0.03O₂ Cathode Material Prepared from Size-Regulated Precursor Fine Particles

Abstract

A lithium-rich layered cathode material, Li_1.2Ni_0.18Mn_0.59Co_0.03O₂, was synthesized from size-regulated precursor nanoparticles, which were prepared by a reverse microemulsion technique. The resulting material demonstrated a good cycle stability (50th cycle discharge capacity: 281 mAh g⁻¹ at 20 mA g⁻¹) without any additional modifications or treatments and a high capacity retention (52%) even at 640 mA g⁻¹ compared to the one (5% at 640 mA g⁻¹) obtained via a spray-drying synthesis as a reference. This article is the first report of trying to synthesize a lithium-rich layered cathode material having a high rate capability by controlling the morphology and homogeneity of the precursor particles based on a reverse microemulsion technique.