材料科学
锂(药物)
离子键合
离子电导率
离子
电导率
兴奋剂
导线
晶界
电解质
纳米技术
化学物理
化学工程
电极
光电子学
化学
物理化学
复合材料
微观结构
内分泌学
有机化学
工程类
医学
作者
Yao Shan,Chenyong Li,Bing Jia,Haoran Xu,Shihua Dong,Jian Tian
标识
DOI:10.1016/j.jmst.2023.04.009
摘要
The inferior ionic conductivity of composite polymer electrolytes (CPEs) caused by grain boundary impedance is one of the critical issues. Adjustable ion transport channels at the molecular level can improve ionic conductivity and lithium-ion transference number. Herein, UIO-66-NSO2CF3Li-Li6.4La3Zr1.4Ta0.6O12 (UIOLiTF-LLZTO) ionic conductor derived from metal-organic frameworks (MOFs) was designed by a covalent grafted strategy of trifluoromethylsulfonyl (TF) group on UIOLiTF and a doping process of LLZTO, showing two new lithium-ion transfer channels driven by molecular coordination-doping engineering. The first channel along UIOLiTF-UIOLiTF was constructed due to the existence of the TF group on UIOLiTF. The second channel along UIOLiTF-LLZTO was constructed due to the direct nanometer contact interface between the opened channel of UIOLiTF and LLZTO. Then TF group acts as “claws” to capture and transfer lithium-ion along the different channels, facilitating improving ionic conductivity and reducing grain boundary impedance. Benefiting from the molecular coordination-doping engineering, UIOLiTF-LLZTO exhibits high ionic conductivity of 9.86 × 10–4 S cm–1, a large lithium-ion transference number of 0.79, and a wide electrochemical window of 5.35 V. Meanwhile, all-solid-state Li|UIOLiTF-LLZTO|LiFePO4 batteries show a high specific capacity of 164.5 mAh g–1 and 155.6 mAh g–1 at 0.2 C and 0.5 C, respectively. Therefore, UIOLiTF-LLZTO demonstrates the way towards the development of MOFs-based CPEs for all-solid-state lithium batteries with high performance.
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