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

Graphical A ploy(1,3-dioxolane) (PDOL) layer was constructed by a Al(OTf) 3 -induced in-situ solidification process between the interface of LATP and anode/cathode. The as-prepared PDOL as an “interfacial adhesive” can fill the gap between the LATP and the electrode, providing a better interfacial contact and reduced interfacial impedance. Such interfacial adhesive layer not only effectively prevents Li metal from reducing LATP but also provides intimate interface contact and limits unnecessary electron transport. 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.