文献类型：期刊文献

英文题名：A lithiated organic nanofiber-reinforced composite polymer electrolyte enabling Li-ion conduction highways for solid-state lithium metal batteries

作者：Tian, Liying[1];Liu, Ying[2];Su, Zhe[1];Cao, Yu[1];Zhang, Wanyu[1];Yi, Shan[1];Zhang, Yayun[1];Niu, Bo[1];Dong, Panpan[3];Long, Donghui[1]

机构：[1]East China Univ Sci & Technol, Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Ctr Computat Chem, Res Inst Ind Catalysis, Key Lab Adv Mat,Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA

年份：2021

卷号：9

期号：42

起止页码：23882

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20214611146141);WOS:【SCI-EXPANDED(收录号:WOS:000708553900001)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 22078100, 21878091 and 22008073) and Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Lithium compounds - Polymer films - Solvents - Economic and social effects - Lithium-ion batteries - Mechanical stability - Solid electrolytes - Solid state devices - Reinforcement - Ionic conduction in solids - Solid-State Batteries - Composite films - Polyelectrolytes - Nanofibers

摘要：Solid polymer electrolytes (SPEs) with good flexibility and low cost are very promising for all-solid-state lithium metal batteries, but they suffer from the trade-off between ionic conductivity at room temperature and mechanical stability. Herein, a robust composite polymer electrolyte is prepared by thermal lamination of PEO polymer electrolyte films onto a lithiated organic nanofiber membrane (LOF), which could combine the merits of 3D Li-ion conduction highways for high ionic conductivity and nanofiber-reinforced networks for good mechanical properties. The intimate combination between the nanofibers and the PEO matrix endows the LOF-reinforced PEO composite (LOF-CPE) with homogeneous structure, leading to an enhanced ultimate tensile stress of 8.9 MPa. Furthermore, the introduction of the LOF significantly decreases the crystallinity of the polymer matrix, which accelerates polymer segmental motion. The well-designed LOF also constructs an interfacial percolation network with additional active Li+, resulting in the formation of high-speed Li-ion conduction pathways. Therefore, the as-prepared LOF-CPE delivers an excellent ionic conductivity of 7.41 x 10(-5) S cm(-1) at 30 degrees C. While used as a SPE in LiFePO4|Li solid-state batteries, the batteries exhibit good cyclability with a capacity retention of 82% after 500 cycles under 0.5C. This work provides a very promising strategy for solid polymer electrolytes to simultaneously achieve high ionic conductivity and excellent mechanical properties towards high-performance solid-state lithium metal batteries.