Poly(1,3-Dioxolane)-Modified Li_1.3Al_0.3Ti_1.7(PO₄)₃ as the Electrolyte for Enhanced Solid Lithium Metal Batteries

Li_1.3Al_0.3Ti_1.7(PO₄)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.