Meanwhile, the 0.5 wt% GaF3-coated LNMO exhibited an obviously better cycle life than the bare sample at 60 °C, delivering a discharge capacity of 120.4 mAh g−1 after 300 cycles, 82.9% of its initial discharge capacity, while the pristine only gave 75 mAh g−1.
As the annealing time increases, the absorbance spectra exhibit a red shift relative to the bare sample (Figure 3a).
As shown in Figure 4a, the absorbance spectra show a red shift relative to the bare sample, confirming increased nanoparticle size with high annealing temperature.
The NP array with only a Au holey backreflector (hereafter indicated by "backreflector") has much larger reflection compared with the bare sample and disk, as a large portion of the surface area is covered by the highly reflective Au thin film.
Hence, to control the electrode stability in high voltage spinel LiNi0.5Mn1.5O4, a bare LNMO sample coated with Al2O3 by Atomic Layer Deposition (ALD) were prepared, then exposed to 5.3 V for 100 h.
Notably, Li(Ni0.5Co0.2Mn0.3 0.99Zr0.01O2 showed a capacity retention of 83.78% at 1C after 100 repeated cycle in a high voltage of 4.6 V, while that of bare sample remains only 69.35%.
The bare sample exhibits fast initial relaxation.
The bare sample has no clear features and relatively low reflectance in the whole wavelength range.
The morphology of the C/ZnO (Figure 2b) resembles that of the bare sample.
