Nanoporous Metal‐Organic Framework Interphase Stabilized Ni 0.6 Co 0.2 Mn 0.2 O ₂ Cathode for High‐Energy Lithium Batteries

Ni‐rich layered oxide cathodes have been widely used in high‐energy‐density lithium‐ion batteries, yet they often suffer from interfacial degradation, transition metal dissolution, and structural instability during prolonged cycling. Herein, we report a facile mechanical fusion strategy to construct a Zn‐based metal‐organic framework (MOF) coating on Ni‐rich NCM622 particles. The nanoporous ZIF‐8 layer functions as an ionic sieve that regulates Li + desolvation and promotes the formation of a stable and ionic conductive cathode–electrolyte interphase. As a result, the modified cathode delivers significantly improved electrochemical performance, achieving 92.0% capacity retention after 100 cycles at 1 C and a rate performance of over 72.0% capacity retention at 5 C. Furthermore, when integrated into a MOF‐based quasisolid‐state lithium metal battery together with a UiO‐66@polyvinylidene fluoride electrolyte membrane and a thin lithium anode, the system demonstrates stable long‐term cycling with 80.2% capacity retention after 300 cycles. This work highlights the potential of MOF‐enabled interfacial engineering for stabilizing Ni‐rich cathodes and advancing high‐energy‐density lithium batteries.