“…The corresponding potential differences ( V) between anodic peak and cathodic one at 3.8 V for NCM-WH, NCM-W and NCM-N are 0.112 V, 0.112 V and 0.190 V respectively, meaning that the redox and electron transferring for NCM-WH and NCM-W electrode would be quicker than those for NCM-N electrode. 38,39 NCM-WH and NCM-W electrodes possess better cycle reversibility and rate capacity during the intercalation/deintercalation process.…”
To illustrate the effect of microwave radiation on the morphologies and electrochemical properties electrode materials, Ni-rich oxide LiNi 0.85 Co 0.05 Mn 0.1 O 2 was identified and prepared from the corresponding precursors synthesized under different reaction conditions. The results suggest that the resultant LiNi 0.85 Co 0.05 Mn 0.1 O 2 morphology controllably depends on its corresponding synthetic method, which will affect its electrochemical property accordingly. The electrode material from microwave-assisted co-precipitation followed by a hydrothermal modification (NCM-WH) possesses a pure α-NaFeO 2 phase and regular spheroidal morphology with a proper size over 10 μm, which exhibits more excellent discharge capacity of ca. 150 mAh g -1 after 200 cycles and better capacity retention of 88.3% than those from microwave-assisted co-precipitation method (NCM-W) or normal co-precipitation method (NCM-N) only. The improved electrochemical properties are confirmed from their ordered phase structure, regular spheroidal morphology and high tap density, which results in lower Li/Ni cation mixing, faster solid-state ion diffusion, higher electrochemical reversibility and better structure stability during the long-tern cycles.
“…The corresponding potential differences ( V) between anodic peak and cathodic one at 3.8 V for NCM-WH, NCM-W and NCM-N are 0.112 V, 0.112 V and 0.190 V respectively, meaning that the redox and electron transferring for NCM-WH and NCM-W electrode would be quicker than those for NCM-N electrode. 38,39 NCM-WH and NCM-W electrodes possess better cycle reversibility and rate capacity during the intercalation/deintercalation process.…”
To illustrate the effect of microwave radiation on the morphologies and electrochemical properties electrode materials, Ni-rich oxide LiNi 0.85 Co 0.05 Mn 0.1 O 2 was identified and prepared from the corresponding precursors synthesized under different reaction conditions. The results suggest that the resultant LiNi 0.85 Co 0.05 Mn 0.1 O 2 morphology controllably depends on its corresponding synthetic method, which will affect its electrochemical property accordingly. The electrode material from microwave-assisted co-precipitation followed by a hydrothermal modification (NCM-WH) possesses a pure α-NaFeO 2 phase and regular spheroidal morphology with a proper size over 10 μm, which exhibits more excellent discharge capacity of ca. 150 mAh g -1 after 200 cycles and better capacity retention of 88.3% than those from microwave-assisted co-precipitation method (NCM-W) or normal co-precipitation method (NCM-N) only. The improved electrochemical properties are confirmed from their ordered phase structure, regular spheroidal morphology and high tap density, which results in lower Li/Ni cation mixing, faster solid-state ion diffusion, higher electrochemical reversibility and better structure stability during the long-tern cycles.
“…Similar to the results of previous studies, [29][30][31] a pair of major redox peaks is observed in the potential range of 3.6-4.0 V. In cyclic voltammograms, the potential difference between anodic peak and cathodic peak (¼ DV) is known to indicate the reversibility of Li + intercalation/deintercalation processes, wherein a larger potential difference represents stronger electrode polarization. [31][32][33] In the pristine LiNi 1/3 Co 1/3 Mn 1/3 O 2 (Fig. 8(a)), DV increases from 0.068 V (after the 1 st cycle) to 0.229 V (after the 50 th cycle), which reveals the deterioration of reversibility of Li + (de)intercalation during cycling.…”
Section: Structural Characterization Of Pi-wrappedmentioning
“…9, the potential difference (ΔV) between anodic and cathodic peaks of V-0.005 NCM, indicating polarization, is smaller (0.079 V) than pristine (0.143 V). It suggests that V-0.005 NCM has a better electrochemical reversibility during the charge/discharge process 46–48 . These low R ct and polarization values ensure slow capacity fading during long term cycling.Figure 9The cyclic voltammetry of pristine and V-doped NCM samples.…”
Ni-rich layered LiNi
0.84
Co
0.10
Mn
0.06
O
2
cathode material was modified by doping with vanadium to enhance the electrochemical performances. The XRD, FESEM and XPS analyses were indicated that the vanadium is successfully doped in the crystal lattice of LiNi
0.84
Co
0.10
Mn
0.06
O
2
with high crystallinity. 0.05 mol% vanadium doped LiNi
0.84
Co
0.10
Mn
0.06
O
2
exhibits superior initial discharge capacity of 204.4 mAh g
−1
, cycling retention of 88.1% after 80 cycles and rate capability of 86.2% at 2 C compared to those of pristine sample. It can be inferred that the vanadium doping can stabilize the crystal structure and improve the lithium-ion kinetics of the layered cathode materials.
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