Fig. 1. XRD peaks of LiNi0.8Co0.1Mn0.1O2 obtained from Ecopro (Korea). (b) FE-SEM image of NCM811 with a spherical morphology (c and d). HR-TEM images of 50-cycle ALD Al2O3-modified particles.
Fig. 2. TEM elemental mapping of LiNi0.8Co0.1Mn0.1O2 with two, five, and 10 cycles of ALD Al2O3 modification.
Fig. 4. EIS spectra of ALD Al2O3-modified electrodes (a) before (inset shows the equivalent circuit) and (b) after cycling at a rate of 1 C at room temperature for 100 cycles.
Fig. 5. FE-SEM images of the NCM811 electrode after 500 cycles at a high temperature (50℃): (a) pristine electrode and (b) Al2O3-coated electrode/
Fig. 6. Schematic of ALD Al2O3-modified NCM811 electrode
Fig. 3. (a, b) Charge–discharge and differential capacity plot of ALD-modified NCM811 at room temperature (0.2 C rate). (c) Rate capability studies and (d) cycling profiles of Al2O3-modified NCM811 at room temperature at a rate of 1 C. (e) Rate performance of ALD-modified NCM811 electrodes at 50℃. (f) Cycling stability of Al2O3-modified NCM811 electrodes at a rate of 5 C in elevated-temperature conditions.
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