Two-dimensional silica enhanced solid polymer electrolyte for lithium metal batteries  

作　　者：Zhihong Luo Weiyong Li Chong Guo Ya Song Mingxia Zhou Yan Shi Jing Xu Long Li Bin Shi Quansheng Ouyang Jiao-jing Shao Guangmin Zhou 

机构地区：[1]School of Materials and Metallurgy,Guizhou University,Guiyang,550025,China [2]State Key Laboratory of Advanced Chemical Power Sources,Zunyi,563003,China [3]Graphene Materials Engineering Research Center of Guizhou Colleges and Universities,Guiyang,550025,China [4]Tsinghua-Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate Schoo,Tsinghua University,Shenzhen,518055,China

出　　处：《Particuology》2024年第2期146-154,共9页颗粒学报（英文版）

基　　金：supported by National Natural Science Foundation of China(grant Nos.52062004 and 51972070);Guizhou Provincial High Level Innovative Talents Project(grant No.QKHPTRC-GCC[2022]013-1);Guizhou Provincial Science and Technology Projects(grant Nos.QKHJC[2020]1Z042,QKHJC[2020]1Y230 and QKHZC[2021]YB317);Cultivation Project of Guizhou University(grant No.GDPY[2019]01).

摘　　要：Solid polymer electrolytes(SPEs)are promising substitutes for current flammable liquid electrolytes to achieve high-safety and high-energy-density lithium metal batteries.Polyethylene oxide(PEO)based solid polymer electrolytes have attracted increasing attention because of their excellent flexibility,manufacturability,light weight,and low-cost processing,while they often suffer from low ionic con-ductivity at room temperature,low lithium transference number and unsatisfactory interfacial resis-tance,which largely restrain their practical application.Herein,two-dimensional holey silica nanosheets(2D-HSN)as the fillers,together with LiNO_(3) as the electrolyte additive,are introduced in a PEO/poly(-vinylidene fiuoride-co-hexafluoropropylene)(PVDF-HFP)blended polymer matrix to obtain a SPE.The incorporation of HSN filler creates supplementary channels for lithium ion migration and lowers the crystallinity of the polymer,thereby facilitating the movement of lithium ions.The HSN-based SPE demonstrates higher ionic conductivity up to 3.7 x 10-4 S cm-1 at 30℃,larger Li+transference number close to 0.34,and more stable lithium plating/stripping than that without the fillers,and HSN can promote the formation of more stable solid electrolyte interphase(SEI)layer.The as-assembled LiFePO4||Li batteries deliver a high specific capacity of 159 mA h g-1 with the capacity retention of 95.5%after 200 cycles at 30℃,as well as superior rate performance and cycling stability compared to that using the blank SPE.

关 键 词：Vermiculite nanosheets Two-dimensional silica Solid polymer electrolytes FillersLithium metal batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]