New dual-shell coating boosts lifespan of lithium-rich batteries

Researchers from Hebei University and Longyan University in China have developed a novel dual-shell coating, termed LiF@spinel, that significantly enhances the durability and performance of lithium-rich cathodes in lithium-ion batteries. This design integrates two protective layers: a spinel buffer that facilitates rapid lithium-ion transport and an outer lithium fluoride (LiF) layer that chemically bonds with nickel-fluoride anchors to shield the cathode from corrosive electrolyte attacks. Constructed via in situ reconstruction, the coating forms a seamless 3D network confirmed by advanced microscopy and spectroscopy techniques. Performance tests demonstrated that batteries with this coating retained 81.5% capacity after 150 cycles at 2 C, outperforming uncoated counterparts, and maintained over 80% capacity even under ultrafast cycling at 5 C, with reduced resistance and fewer degradation by-products. This breakthrough addresses key challenges in lithium-ion battery technology, such as cathode instability, electrolyte breakdown, capacity fade, and safety risks, which