Interface Engineering of Aluminum Foil Anode for Solid-State Lithium-Ion Batteries under Extreme Conditions
Jiazhen Cai, Xin Zhang, Huiyang Gou, Gongkai Wang
Abstract
Alloy foil anodes have garnered significant attention because of their compelling metallic characteristics and high specific capacities, while solid-state electrolytes present opportunities to enhance their reversibility. However, the interface and bulk degradation during cycling pose challenges for achieving low-pressure and high-performance solid-state batteries. In this study, we engineered a nonintrusive solid-state electrolyte rich in fluorine and boron and developed aluminum metal foils featuring a densely structured and highly lithiated interface, effectively suppressing interfacial contact loss and promoting the formation of a stable interfacial layer rich in fluorine and boron, helping to minimize fluctuations in Coulombic efficiency. With high areal cathode capacities (∼2.5 mAh cm –2 ), the low-pressure solid-state battery exhibited stable cycling performance for over 140 cycles, achieving an average Coulombic efficiency of 99.86%. Our findings provide a solid framework for designing durable electrolyte/anode interfaces in ambient-pressure, intrinsically safe alloy-foil-based solid-state batteries.