核壳纤维结构PEO-LiTFSI-SiO_(2)复合固体电解质  

PEO-LiTFSI-SiO_(2) composite solid electrolyte with core-shell fiber structure

作　　者：杜玉霖 郭祖民 庞越鹏 DU Yulin;GUO Zumin;PANG Yuepeng(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《有色金属材料与工程》2024年第6期16-23,共8页Nonferrous Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(52171218)。

摘　　要：聚合物基固体电解质有望率先应用于固态电池,如何有效成膜并抑制枝晶的生长意义重大。通过同轴静电纺丝方法制备了PEO-LiTFSI-SiO_(2)复合固体电解质(composite solid electrolyte,CSE),研究了该CSE的离子电导率、锂枝晶的抑制能力。结果表明,其离子电导率达到1.4×10^(-4) S/cm,抗拉强度为5.64 MPa,锂对称电池的循环寿命在电流密度为0.1 mA/cm^(2)时显著延长至900 h,而且组装的LiFePO_(4)||Li固态电池在0.2 C时的首圈放电比容量为149 mA·h/g,200圈循环后的容量保持率为95%。说明同轴静电纺丝方法用于生产CSE具有明显优势,能够显著提升其离子传导性能,并能有效预防锂枝晶的.形成。Polymer-based solid electrolytes are expected to be the first to be applied in solid-state batteries,in which effective film formation and inhibit the growth of dendrites are of great significance.A PEO-LiTFSI-SiO_(2) composite solid electrolyte(CSE)was prepared using the coaxial electrospinning method.The ionic conductivity and inhibition ability of lithium dendrites of the CSE were investigated. The results showed that the ionic conductivity reaches 1.4×10^(-4)/cm,with a tensile strength of 5.64 MPa.The cycle life of lithium symmetric cells is significantly extended to 900 h under a current density of 0.1 mA/cm^(2).Furthermore,the assembled LiFePO4||Li solid-state battery exhibited an initial discharge specific capacity of 149 mA·h/g at 0.2 C,with a capacity retention rate of 95%after 200 cycle.These findings demonstrate the significant advantages of coaxial electrospinning for producing CSE,which can markedly improve ionic conductivity and effectively prevent lithium dendrite formation.

关 键 词：复合固体电解质 固态电池 同轴静电纺丝 

分 类 号：TM912[电气工程—电力电子与电力传动]