![]() ![]() These findings highlight that both the structural and interfacial stability should be taken into account when tailoring cathode materials for high voltage battery = ,Īscribed to their higher capacity and lower cost compared to conventional LiCoO 2, the Ni-rich layered LiNi 0.6Mn 0.2Co 0.2O 2 (NMC622) is now considered as one promising cathode for lithium-ion batteries (LIBs). In addition, oxidation of the electrolyte solvents by the extracted oxygen species generates acidic species, which then attack the electrode surface and form highly resistive LiF. The fundamental reason behind the poor structural and interfacial stability of NMC 333 was found to be correlated to its high Co content and the significant overlap between the Co 3+/4+ t 2g and O 2- 2p bands, resulting in oxygen removal and consequent structural changes at high voltages. In contrast to NMC 442, NMC 333 exhibits rapid structural changes including severe micro-crack formation and phase transformation from a layered to a disordered rock-salt structure, as well as interfacial degradation during high-voltage cycling, leading to a rapid increase of the electrode resistance and fast capacity decline. The capacity degradation mechanism in lithium nickel–manganese–cobalt oxide (NMC) cathodes (LiNi 1/3Mn 1/3Co 1/3O 2 (NMC 333) and LiNi 0.4Mn 0.4Co 0.2O 2 (NMC 442)) during high-voltage (cut-off of 4.8 V) operation has been investigated. ![]()
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