Perovskite Membranes with Vertically Aligned Microchannels for All‐Solid‐State Lithium Batteries. Issue 27 (13th August 2018)

• Record Type: Journal Article
• Authors: Jiang, Zhouyang; Xie, Huiqi; Wang, Suqing; Song, Xiong; Yao, Xiang; Wang, Haihui
• Is Part Of: Advanced energy materials. Volume 8:Issue 27(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-08-13
• Subjects: all‐solid‐state batteries -- asymmetrical frameworks -- interfacial resistance -- perovskite electrolytes; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201801433
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: 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 Li0.34 La0.51 TiO3 (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 Ω 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. Abstract : This study constructs a perovskite electrolyte with vertically aligned microchannels by a phase‐inversion method. In contrast to planar interphases, the microchannel framework of this electrolyte transforms the 2D contact between the cathode material and the electrolyte into a 3D contact. This 3D contact can effectively reduce the interfacial resistance, which is attributed to the enlarged Li‐ion flux area.