Redox Pathways in the O₂-Type Lithium-Excess Cathode. (IMAGE)
Caption
Redox Pathways in the O₂-Type Lithium-Excess Cathode. The schematic illustrates the electrochemical processes of the O₂-type Li₀.₇₅[Li₀.₁₅Ni₀.₁₅Mn₀.₇]O₂ cathode during charge and discharge. Sequential redox reactions of Ni²⁺/Ni⁴⁺, lattice oxygen (O²⁻/O₂ⁿ⁻), and Mn⁴⁺/Mn³⁺ drive high reversible capacity while preserving structural stability. Spin density distributions (SDD) highlight the evolving electronic states of Ni, Mn, and O, confirming the synergistic cationic–anionic redox mechanism that underpins the material’s superior energy density and cycling durability.
Credit
Jun Ho Yu, et al
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CC BY-NC-ND