Asymmetric fireproof gel polymer electrolyte constructed by boron-contained covalent organic framework for dendrite-free sodium metal battery
作者机构：Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University Wuxi 214122 China BTR New Material Group Co. Ltd. Shenzhen 518000 China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2024年第17卷第11期
页 面：9679-9687页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：financially supported by the Natural Science Foundation of Jiangsu Province(No.BK20210474) the National Natural Science Foundation of China(NSFC,No.52203261) the project of research on the industrial application of “controllable synthesis of nanocarbon-based polymer composites and their application in new energy”(No.CJGJZD20210408092400002)
主 题：gel polymer electrolyte sodium metal battery covalent organic framework flame-retardant interfacial stability
摘 要：Gel polymer electrolytes (GPEs) with flexibility, easy processability, and low cost have been regarded as promising alternatives for conventional liquid electrolytes in next-generation sodium metal batteries (SMBs). However, GPEs often suffer from combustion risk and inferior interfacial compatibility toward Na metal anode, which severely limit their wide commercial applications. Here, a rational design of asymmetric fireproof GPE (AFGPE) modified with a boron-contained covalent organic framework (BCOF) on one side is developed through in-situ crosslinking polymerization process. Benefiting from the unique structure and composition, the resulting AFGPE exhibits high Na+ transference number, wide electrochemical window, excellent mechanical properties and high safety. Especially, the nanoscale BCOF layer with uniform nanochannels works as ion sieve that homogenizes Na+ flux during Na plating process, while the abundant Lewis-acid B sites can strongly capture counter anions and decrease space charge layer at anode side, thus promoting the uniform Na deposition to effectively suppress dendrite growth. Consequently, the Na/AFGPE/Na symmetric cells demonstrate remarkable cycling stability for over 1200 h at 0.1 mA·cm^(-2), and the solid-state SMBs exhibit outstanding cycling properties and rate capability, delivering a high capacity retention of 96.4% under current density of 1 C for over 1000 cycles.
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