Amino-modified UiO-66-NH_(2) reinforced polyurethane based polymer electrolytes for high-voltage solid-state lithium metal batteries  

作　　者：Danru Huang Lin Wu Qi Kang Zhiyong Shen Qiaosheng Huang Wenjie Lin Fei Pei Yunhui Huang 

机构地区：[1]State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission, China Energy Science and Technology Research Institute Co., Ltd., Nanjing, 210023, China [2]State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China [3]Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China

出　　处：《Nano Research》2024年第11期9662-9670,共9页纳米研究（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52202236 and 5202780089);China Postdoctoral Science Foundation(Nos.2024T170300 and 2022M711232).

摘　　要：Solid-state polymer electrolytes(SPEs)are candidate schemes for meeting the safety and energy density needs of advanced lithium-based battery because of their improved mechanical and electrochemical stability compared to traditional liquid electrolytes.However,low ionic conductivity and side reactions occurring in traditional high-voltage lithium metal batteries(LMBs)hinder their practical applications.Here,amino-modified metal-organic frameworks(UiO-66-NH_(2))with abundant defects as multifunctional fillers in the polyurethane based SPEs achieve the collaborative promotion of the mechanical strength and room temperature ionic conductivity.The surface modified amino groups serve as anchoring points for oxygen atoms of polymer chains,forming a firmly hydrogen-bond interface with polycarbonate-based polyurethane frameworks.The rich interfaces between UiO-66-NH_(2) and polymers dramatically decrease the crystallization of polymer chains and reduce ion transport impedance,which markedly boosted the ionic conductivity to 2.1×10^(−4) S·cm^(−1) with a high Li+transference numbers of 0.71.As a result,LiFePO4∣SPEs∣Li cells exhibit prominent cyclability for 700 cycles under 0.5 C with 96.5%capacity retention.The LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)∣SPEs∣Li cells deliver excellent long-term lifespan for 260 cycles with a high capacity retention of 91.9%and high average Coulombic efficiency(98.5%)under ambient conditions.This simple and effective hybrid SPE design strategy sheds a milestone significance light for high-voltage Li-metal batteries.

关 键 词：solid-state polymer electrolyte metal-organic frameworks POLYURETHANE lithium metal batteries high voltage interface 

分 类 号：TM912[电气工程—电力电子与电力传动]