Ultrathin inorganic-organic solid-state electrolyte reinforced by a prefiberized LAGP continuous skeleton  

预纤维化、连续LAGP骨架增强超薄有机-无机固态电解质

作　　者：Shiya Li Shuhao Wang Gaofeng Du Jianing Liang Zhaoming Tong Yanming Cui Jiu Lin Xiaoxiong Xu Xizheng Liu Tianyou Zhai Huiqiao Li 李诗雅;王书豪;杜高锋;梁嘉宁;童钊明;崔言明;林久;许哓雄;刘喜正;翟天佑;李会巧(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Key Laboratory of Optoelectronic Chemical Materials and Devices(Ministry of Education),School of Optoelectronic Materials&Technology,Jianghan University,Wuhan 430056,China;Zhejiang Funlithium New Energy Technology Co.,Ltd.,Ningbo 315201,China)

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]Key Laboratory of Optoelectronic Chemical Materials and Devices(Ministry of Education),School of Optoelectronic Materials&Technology,Jianghan University,Wuhan 430056,China [3]Zhejiang Funlithium New Energy Technology Co.,Ltd.,Ningbo 315201,China

出　　处：《Science China Materials》2025年第1期199-206,共8页中国科学(材料科学)(英文版)

基　　金：National Key R&D Program of China (2021YFB3800300 and 2023YFB2503900);National Natural Science Foundation of China (52072138);technical support from the Analytical and Testing Center of Huazhong University of Science and Technology (HUST)。

摘　　要：Inorganic-organic composite electrolyte is proved an effective way to enhance the overall performance of the electrolytes.However,simply combining powder fillers with polymers is not sufficient for the application of composite electrolytes.In this work,we designed an ultrathin organic-inorganic composite solid electrolyte with high mechanical strength and ionic conductivity,in which the inorganic Li1.5Al0.5Ge1.5(PO_(4))3(LAGP)solid electrolyte is prefiberized into a three-dimensional nanofiber network to serve as a self-supporting skeleton for the polyethylene oxide(PEO)matrix.This continuous skeleton structure not only significantly improves the mechanical strength of the PEO-based electrolyte,but also forms a continuous lithium-ion conduction path,promoting the rapid migration of lithium ions.The fiber-reinforced composite electrolyte has an ionic conductivity of 8.27×10^(−4) S cm^(-1) at 60°C and a tensile strength of up to 4.29 MPa.Besides,it exhibits a reduced overpotential and stable long-term cycling performance over 1700 h when used in Li/Li symmetric batteries.The LiFePO_(4)(LFP)|Li cell assembled with the fiber-reinforced composite electrolyte also delivers a specific capacity of about 142 mAh g^(−1) over 300 cycles at 0.5 C and maintains good cycling stability.This work provides a novel idea for designing the next generation of safe and reliable organic-inorganic composite solid-state electrolyte membranes.有机–无机电解质复合被认为是提高固态电解质整体性能的有效措施.然而,简单地将粉末材料填料添加到有机聚合物中并不能显著提高电解质的机械性能.在这项工作中,我们设计了一种超薄、高机械强度和离子电导率的有机–无机复合固态电解质,其中无机固态电解质(Li1.5Al0.5Ge1.5(PO_(4))3, LAGP)被预纤维化成一个三维纳米网络骨架,预纤维化的LAGP作为聚氧化乙烯(PEO)基质的自支撑骨架.这种连续的骨架结构不仅显著提高了PEO基电解质的机械强度,还形成了一个连续的锂离子传导路径,促进了锂离子的快速迁移.纤维增强的复合电解质膜在60°C时的离子电导率为8.27×10-4S cm^(-1),拉伸强度高达4.29 MPa.此外,当用于Li/Li对称电池时,它表现出较低的过电势和超过1700 h的循环稳定性.组装的LiFePO_(4)(LFP)|Li电池在0.5 C电流下经过300个循环后比容量为142 mAh g^(-1),循环稳定性良好.该工作为设计下一代安全可靠的有机-无机复合固态电解质膜提供了新思路.

关 键 词：solid-state lithium metal batteries solid-state electrolytes polymer electrolytes LAGP structure design ultra-thin electrolyte membrane 

分 类 号：TM912[电气工程—电力电子与电力传动]