Fig. 1: Gr coating on Ni-rich oxides.
From: Graphene collage on Ni-rich layered oxide cathodes for advanced lithium-ion batteries
a Schematic of Gr collage on Ni-rich oxide particles. SEM images of b, c Gr-coated and e bare NCA particles and d HRTEM image of Gr-coated NCA particle. The scale bar in b–e indicates 1 μm, 100 nm, 10 nm, and 100 nm, respectively. f Optical and g, h confocal Raman mapping images and i Raman spectrum on Gr-coated NCA particles. The Raman maps of NCA (Eg and A1g mode) and Gr (G band) are shown in g and h, respectively. The scale bars in f–h indicate 4 μm. j Electrical conductivity of Gr-coated NCA powder and mixture powders containing NCA and CB with weight ratios of 96:2 and 98:1. k BET surface area of the bare and Gr-coated NCA powders and the mixture powder (NCA:CB = 96:2).
