The Research on Voltage Decay of Lithium-rich Layered Oxide Cathodes
Lithium-rich layered oxide(LLO)cathodes,such as Li1.2Ni0.13Co0.13Mn0.54O2,feature a composite structure of Li2MnO3 and LiTMO2 phases.From the perspective of molecular orbital theory,the unique Li-O-Li configuration in Li2MnO3 phase activates lattice oxygen redox(LOR)through O2p non-bonding orbitals,pro-viding additional specific capacity from the Li2MnO3 phase under high voltage(＞4.5 V)via this special LOR.However,the material faces several challenged that hinder its commercialization,including low initial Coulomb efficiency,poor rate performance,and continuous voltage decay during cycling.The issue of voltage decay can lead to a persistent decrease in the energy density of LLO,posing difficulties for the application of electric vehicle battery management systems and presenting the greatest obstacle to the commercialization of LLO.This manu-script reviews the structure and mechanisms of LLO,focusing on its voltage decay,discussing possible solu-tions,and highlighting future research priorities,thereby providing valuable insights for the future design of LLO.
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