Enhancement on inter-layer stability on Na-doped LiNi0.6Co0.2Mn0.2O2 cathode material

The LiNi0.6Co0.2Mn0.2O2 cathode material with gradient modification of sodium ion doping is synthesized by milling-spray and calcination two step method. XRD, EDS and XPS reveal that Na+ doping in the lattice enlarges the lithium interlayer spacing and reduces the level of cation mixing, which can be conducive to the formation of regular interlayer structure. Na-doped sample shows a high capacity (179mAh g(-1) at 0.2C), superior rate property (152.6 mAh g(-1) at 1C, 133.9 mAh g(-1) at 5C) and excellent cyclic stability at high current density (82.8% after 150 cycles at 1C and 73.7% after 150 cycles at 5C). Due to the pillaring effect of Na ions with large radius, the modified samples can still maintain a complete spherical morphology after long-term cycling. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The LiNi0.6Co0.2Mn0.2O2 cathode material doped with Na+ shows enlarged lithium interlayer spacing, reduced cation mixing, high capacity, superior rate capability, excellent cyclic stability, and maintains spherical morphology after long-term cycling due to the pillaring effect of Na ions.