A Single-Ion Conducting UiO-66 Metal–Organic Framework Electrolyte for All-Solid-State Lithium Batteries
journal contributionposted on 01.04.2020 by Hui Yang, Botong Liu, Joeseph Bright, Sujan Kasani, Jianhui Yang, Xiangwu Zhang, Nianqiang Wu
Any type of content formally published in an academic journal, usually following a peer-review process.
A metal–organic framework (MOF) single lithium-ion conductor has been synthesized by covalently immobilizing anions to the skeleton of MOF structures. The functionalized UiO-66 MOF exhibits an electrochemical stability window of 5.2 V versus Li|Li+ and ionic conductivity of 6.0 × 10–5, 7.9 × 10–5, and 1.1 × 10–4 S/cm at 25, 60, and 90 °C, respectively. It displays single-ion conducting behavior with a high Li-ion transference number of 0.90 at 25 °C in the absence of any plasticizer. After ethylene carbonate and propylene carbonate are incorporated into the MOF structure, its ionic conductivity reaches 7.8 × 10–4 S/cm at room temperature. The MOF electrolyte has been evaluated with all-solid-state Li|MOF|LiFePO4 batteries at room temperature, showing excellent rate capacity and cycling stability.