Perovskite Membranes with Vertically Aligned Microchannels for All-Solid-State Lithium Batteries

Perovskite-type solid-state electrolytes exhibit great potential for the development of all-solid-state lithium batteries due to their high Li-ion conductivity (approaching 10(-3) S cm(-1)), wide potential window, and excellent thermal/chemical stability. However, the large solid-solid interfacial resistance between perovskite electrolytes and electrode materials is still a great challenge that hinders the development of high-performance all-solid-state lithium batteries. In this work, a perovskite-type Li0.34La0.51TiO3 (LLTO) membrane with vertically aligned microchannels is constructed by a phase-inversion method. The 3D vertically aligned microchannel framework membrane enables more effective Li-ion transport between the cathode and solid-state electrolyte than a planar LLTO membrane. A significant decrease in the perovskite/cathode interfacial resistance, from 853 to 133 Omega cm(2), is observed. It is also demonstrated that full cells utilizing LLTO with vertically aligned microchannels as the electrolyte exhibit a high specific capacity and improved rate performance.