Liu Hongyu, Shen Zhaohan, Pan Zheng-Ze, Yu Wei, Nishihara Hirotomo
Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan.
Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan.
ACS Appl Mater Interfaces. 2023 Aug 30;15(34):40397-40408. doi: 10.1021/acsami.3c05944. Epub 2023 Aug 17.
In lithium-oxygen batteries, although the porous carbon cathodes are widely utilized to tailor the properties of discharged LiO, the impact of nanopore size on the LiO formation and decomposition reactions remain incompletely understood. Here, we provide the straightforward elucidation on the effect of pore size in a range of 25-200 nm, using a highly ordered porous cathode matrix based on the carbon-coated anodic aluminum oxide membrane formed on an Al substrate (C/AAO_Al). When the nanopore size is 25 nm, film-like LiO with a thickness of 2-5 nm is formed, possibly via a surface-driven mechanism. When the nanochannel becomes larger, the LiO film thickness saturates at ca. 10 nm, along with crystalline LiO particles possibly formed by a solution-mediated mechanism.
在锂氧电池中，尽管多孔碳阴极被广泛用于调整放电产物Li₂O的性质，但纳米孔尺寸对Li₂O形成和分解反应的影响仍未完全理解。在此，我们使用基于在铝基板上形成的碳包覆阳极氧化铝膜的高度有序多孔阴极基质（C/AAO_Al），对25-200nm范围内的孔径效应进行了直接阐释。当纳米孔尺寸为25nm时，可能通过表面驱动机制形成厚度为2-5nm的薄膜状Li₂O。当纳米通道变大时，Li₂O膜厚度在约10nm处饱和，同时可能通过溶液介导机制形成结晶Li₂O颗粒。
