Poly(1,3‐Dioxolane)‐Modified Li1.3Al0.3Ti1.7(PO4)3 as the Electrolyte for Enhanced Solid Lithium Metal Batteries

Abstract Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) as the solid‐electrolyte has attracted much attention for Li‐ion batteries. However, the unstable LATP/Li interface and the insufficient contact between the anode/cathode and LATP usually lead to the structural collapse of LATP and the large solid–solid interfacial resistance for Li+ transport. Herein, a poly(1,3‐dioxolane) (PDOL) adhesive layer was constructed by a Al(OTf) 3 ‐induced in‐situ solidification process between the interface of LATP and anode/cathode. Such PDOL interfacial adhesive layer alleviates adverse reduction reactions at the LATP/Li interface and provides stable and well‐contacted bilateral electrode interfaces. Benefitting from the PDOL interfacial adhesive, the Li|adhesive‐LATP|Li symmetric cells achieve a current density up to 0.7 mA cm −2 and exhibit a good cycling stability for more than 2750 h at 0.1 mA cm −2 , and the Li|adhesive‐LATP|LiFePO4 solid‐state batteries with interface modification exhibit a capacity of 158 mAh g −1 at 0.2 C with a retention of 94 % after 100 cycles.