3D flame-retardant skeleton reinforced polymer electrolyte for solid-state dendrite-free lithium metal batteries  

作　　者：Xiaojiao Zheng Jiawei Wu Jing Chen Xiaodong Wang Zhenglong Yang 

机构地区：[1]Shanghai Key Laboratory of D&A for Metal-Functional Materials,School of Materials Science and Engineering,Tongji University,Shanghai 200092,China [2]Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology&School of Physics Science and Engineering,Tongji University,Shanghai 200092,China

出　　处：《Journal of Energy Chemistry》2022年第8期174-181,I0006,共9页能源化学（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2017YFA0204600);the National Natural Science Foundation of China(Grant No.5210021666);the Key R&D and Promotion Projects of Henan Province(Grant No.212102310016)。

摘　　要：For solid polymer electrolytes(SPEs),improving their mechanical and electrochemical properties is the key to obtaining batteries with higher safety and higher energy density.Herein,a novel synergistic strategy proposed is preparing a 3D flame-retardant skeleton(3DPA)and adding nano-multifunctional fillers(Li-ILs@ZIF-8).In addition to providing mechanical support for the polyethylene oxide(PEO)matrix,3DPA also has further contributed to the system’s flame retardancy and further improved the safety.Simultaneously,the electrochemical performance is fully guaranteed by rigid Li-ILs@ZIF-8,which provides fast migration channels forLi^(+),reduces the crystallinity of PEO and effectively inhibits lithium dendrites.The limiting oxygen index of the optimal sample(PL3Z/PA)is as high as 20.5%,and the ionic conductivity reaches 2.89×10^(-4) and 0.91×10^(-3) S cm^(-1) at 25 and 55°C,respectively.The assembled Li|PL3Z/PA|Li battery can be cycled stably for more than 1000 h at a current density of 0.1 m A cm^(-2) without short circuit being pierced by lithium dendrites.The specific capacity of the LFP|PL3Z/PA|Li battery was 160.5 m Ah g^(-1) under a current density of 0.5 C,and the capacity retention rate was 90.0%after 300 cycles.

关 键 词：Solid polymer electrolytes Polyethylene oxide 3D flame-retardant skeleton Multifunctional fillers Synergistic effect 

分 类 号：TQ317[化学工程—高聚物工业] TM912[电气工程—电力电子与电力传动]