Dual-filler reinforced PVDF-HFP based polymer electrolyte enabling high-safety design of lithium metal batteries  

作　　者：Chang Fang Kangsheng Huang Jing Zhao Shiqi Tian Hui Dou Xiaogang Zhang 

机构地区：[1]Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies,College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

出　　处：《Nano Research》2024年第6期5251-5260,共10页纳米研究（英文版）

基　　金：the National Key Research and Development Program Intergovernmental International Science and Technology Innovation Cooperation(No.2022YFE0109400);Leading Edge Technology of Jiangsu Province(Nos.BK20202008 and BK20220009);Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).

摘　　要：Despite the high energy density of lithium metal batteries(LMBs),their application in rechargeable batteries is still hampered due to insufficient safety.Here,we present a novel flame-retardant solid-state electrolyte based on polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP)with nano SiO_(2)aerogel as an inert filler but Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO)as an auxiliary component to enhance the ion conductivity.The introduction of SiO_(2)aerogels imparts the polymer electrolyte with exceptional thermal stability and flame retardancy.Simultaneously,the interaction between hydroxyl groups of SiO_(2)particles and PVDF-HFP creates a strong cross-linking structure,enhancing the mechanical strength and stability of the electrolyte.Furthermore,the presence of SiO_(2)aerogel and LLZTO facilitates the dissociation of lithium salts through Lewis acid-base interactions,resulting in a high ionic conductivity of 1.01×10^(−3)S·cm^(−1)and a wide electrochemical window of~5.0 V at room temperature for the prepared electrolytes.Remarkably,the assembled Li|Li cell demonstrates the excellent resistance to lithium dendrite and runs stablly for over 1500 h at a current density of 0.25 mA·cm^(−2).Thus,we prepare a pouch cell with high safety,which can work normally after short-circuiting under the external folding and cutting.

关 键 词：polymer electrolyte SiO_(2)/Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO)dual-filler NON-FLAMMABLE long cycle life lithium metal battery 

分 类 号：TM912[电气工程—电力电子与电力传动]