Competitive coordination enhancing the thermal stability of PDOL electrolytes for safe solid-state lithium metal batteries  

作　　者：Ying-Ying Pei Jiang-Kui Hu Hong Yuan Shi-Jie Yang Xi-Long Wang Zheng Liao Jia Liu Bo-Quan Li Jia-Qi Huang 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China [3]College of Materials Science and Technology,Beijing Forestry University,Beijing 100083,China

出　　处：《Nano Research》2025年第3期243-251,共9页纳米研究(英文版)

基　　金：funded by the Beijing Municipal Natural Science Foundation(No.L223009);the National Natural Science Foundation of China(Nos.22075029,22209014,and 22479012);the National Key Research and Development Program of China(No.2021YFB2500300);the Key Research and Development(R&D)Projects of Shanxi Province(No.2021020660301013);the Fundamental Research Funds for the Central Universities(No.2023CX01031).

摘　　要：Poly(1,3-dioxolane)(PDOL)-based solid electrolytes hold great potential for solid-state lithium(Li)metal batteries due to their superior ionic conductivity at room temperature.However,traditional PDOL electrolytes suffer from inferior thermal stability,which has hampered their practical application.In this work,a competitive coordination mechanism is proposed to strengthen vulnerable ether oxygen bonds in PDOL chains,thereby improving the thermal stability of PDOL electrolytes.The strong coordination of Lewis base ligands on Li_(6.75)La_(3)Zr_(1.75)Ta_(0.25)O_(12)(LLZTO)surface with Li ions weakens the ionic-dipolar interactions between PDOL chains and Li ions,conversely reinforcing the bond energy of ether oxygen bonds.Incorporating LLZTO into PDOL electrolytes effectively enhances the thermal decomposition temperature from 110 to 302℃.Li||LiFePO_(4)full cell with a 12μm ultrathin PDOL hybrid electrolyte delivers enhanced discharge capacity and extended cycling life for 100 cycles at an elevated temperature of 60℃.This work provides critical insights into the development of thermally stable PDOL electrolytes for safe solid-state Li metal batteries.

关 键 词：competitive coordination solid-state battery lithium metal safety electrolyte design 

分 类 号：TM912[电气工程—电力电子与电力传动]