Thermally rearranged covalent organic framework with flame-retardancy as a high safety Li-ion solid electrolyte
作者机构：Renewable Energy Conversion and Storage CenterFrontiers Science Center for New Organic MatterCollege of ChemistryNankai UniversityTianjin300071China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)Nankai UniversityTianjin300071China College of PharmacyNankai UniversityTianjin300071China Department of Chemical Sciences and Bernal InstituteUniversity of LimerickLimerickV94 T9PXIreland Department of PhysicsCity University of Hong KongHong Kong999077China
出 版 物：《eScience》 (电化学与能源科学（英文）)
年 卷 期：2022年第2卷第3期
页 面：311-318页
学科分类：07[理学] 070305[理学-高分子化学与物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
基 金：supported by Tianjin Natural Science Foundation(20JCJQJC00170) National Natural Science Foundation of China(22001131 and 22175099) Frontiers Science Center for New Organic Matter of Nankai University(63181206) 111 Project(B12015) Postdoctoral Science Foundation of China(2019M660974).
主 题：Covalent organic frameworks Thermal rearrangement Flame retardancy Solid polymer electrolytes Lithium-ion batteries
摘 要：Solid polymer electrolytes have demonstrated high promise to solve the safety problems caused by conventional liquid electrolytes in lithium ion batteries.However,the inherent flammability of most polymer electrolyte materials remains unresolved,hence hindering their further industrial application.Addressing this challenge,we designed and constructed a thermal-responsive imide-linked covalent organic framework(COF)bearing ortho-positioned hydroxy groups as precursors,which can conduct a thermal rearrangement to transform into a highly crystalline and robust benzoxazole-linked COF upon heating.Benefiting from the release of carbon dioxide through thermal rearrangement reaction,this COF platform exhibited excellent flame retardant properties.By contrast,classic COFs(e.g.,boronate ester,imine,olefin,imide linked)were all flammable.Moreover,incorpo-rating polyethylene glycol and Li salt into the COF channels can produce solid polymer electrolytes with outstanding flame retardancy,high ionic conductivity(6.42×10^(-4) S cm^(-1))and a high lithium-ion transference number of 0.95.This thermal rearrangement strategy not only opens a new route for the fabrication of ultrastable COFs,but also provides promising perspectives to designing flame-retardant materials for energy-related applications.
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