Enhancing Li-ion conduction and mechanical properties via addition of fluorine-containing metal–organic frameworks in allsolid-state cross-linked hyperbranched polymer electrolytes  

作　　者：Wen Wen Qinghui Zeng Pingping Chen Xin Wen Zhenfeng Li Yu Liu Jiazhu Guan Anqi Chen Wei Liu Liaoyun Zhang 

机构地区：[1]School of chemical sciences,University of Chinese Academy of Sciences,Beijing 100049,China [2]Research Institute of Petroleum Exploration&Development(RIPED),PetroChina,Beijing 100083,China

出　　处：《Nano Research》2022年第10期8946-8954,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52073285 and 11975238);the authors also express gratitude for the help from the analysis and testing center at the University of Chinese Academy of Sciences.

摘　　要：Poly(ethylene oxide)(PEO)-based solid polymer electrolytes(SPEs)are commonly used in lithium metal batteries(LMBs)for their good Li-salt solvating ability and easy processability.However,the relatively low Li-ion conduction ability hinders their further development.In this work,a novel hyperbranched-polyether-type composite solid polymer electrolyte(CSPE)is prepared via a quick cross-linking reaction between aldehyde-terminated polyethylene glycol(PEG)and hyperbranched poly(ethylene imine)(HPEI)in the presence of lithium salt and fluorine-containing Zr-based metal–organic framework(MOF)UiO-66-(F)_(4).The hydrogen bonds between the fluorine atoms and amino groups in the electrolyte help to the better dispersion of UiO-66-(F)_(4) in the polymer matrix,which is beneficial to solving the problem of aggregation of nanofillers.Besides,the CSPEs with the functional MOF fillers show improvements in both electrochemical and mechanical properties.Notably,the Li-ion transference number(t)is considerably enhanced from 0.23 to 0.54.All-solid-state LMBs based on the CSPE also present good cycling performances.A high specific discharge capacity of 141.4 mAh·g^(−1) is remained after 200 cycles at 0.2 C.This study not only provides an effective synthesis method of the cross-linked hyperbranched polymer electrolyte,but also puts forward a new strategy for uniform dispersion of inorganic fillers in CSPEs.

关 键 词：hyperbranched cross-linked polymer electrolyte ALL-SOLID-STATE metal-organic frameworks composite lithium metal batteries 

分 类 号：O63[理学—高分子化学]