Boroxine Crystalline Covalent Organic Frameworks Based Single-ion Quasi-solid-state Conductor in Lithium-ion Battery  

作　　者：Hao-Min Wu Wen-Can Ma Yi-Feng Cai Xin Huang Jun-Heng Li Xi Kai Qiu-Hong Zhang Xu-Dong Jia 

机构地区：[1]Key Laboratory of High-Performance Polymer Material and Technology of MOE,Department of Polymer Science and Engineering,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [2]Institute of Chemical Industry of Forest Products,Chinese Academy of Forestry Department,Nanjing 210018,China [3]School of Chemistryand Chemical Engineering,Frontiers Science Center for Transformative Molecules,Shanghai Jiao Tong University,Shanghai 200240,China [4]Executive in Low Carbon Management Division of QHSE Department,Sinochem Holdings Corporation Ltd,Central Tower,Chemsunny World Trade Center,Bejing 100031,China [5]State Key Laboratory of Coordination Chemistry,Nanjing University,Nanjing 210023,China

出　　处：《Chinese Journal of Polymer Science》2025年第1期177-187,I0012,共12页高分子科学(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.22075130 and 21875102)。

摘　　要：Solid-state electrolytes are considered to be the vital part of the next-generation solid-state batteries(SSBs),due to their high safety and long operation life span.However,the two major factors that impede the expected performance of batteries are:the easy formation of lithium dendrites due to the concentration gradient of anions,and the low ionic conductivity at room temperature,which prevents reaching ideal electrochemical performance.Single-ion quasi-solid-state electrolytes(SIQSSEs)could provide higher safety and energy density,owing to absence of anion concentration gradient and solvent,as well as good lithium-ion transport ability.The porous covalent organic frameworks(COFs)are beneficial for con-structing appropriate lithium-ion transport pathway,due to the ordered 1D channel.In addition,the boroxine COFs(COF-5)offers strong ability of withdrawing anion part of lithium salt.Last but not the least,boron atom could play the role of coordinate site due to its electron deficiency.These advantages afford an opportunity to obtain a SIQSSE with high ionic conductivity and high lithium transference number(LTN)simultaneously.The COF-5 based SIQSSEs delivered a high ionic conductivity of 6.3×10^(-4)S·cm^(-1),with a high LTN of 0.92 and a wide electrochemical stable window(ESW)of 4.7 V at room temperature.The LiFePO4(LFP)/Li cells,which was assembled with COF-5 based SIQSSE,exhibited outstanding long cycle stability,high initial capacity and favorable rate performance.The results indicated COFs could be an ideal material for single-ion solid-state electrolytes in next-generation batteries.

关 键 词：Covalent organic framework Quasi-solid-state electrolyte Single-ion Lithium metal batteries 

分 类 号：TM9[电气工程—电力电子与电力传动]