摘要
Solid polymer electrolyte is one of the most promising avenues to construct next-generation energy storage systems with high energy density,high safety,and flexibility,yet the low ionic conductivity at room temperature and poor high-voltage tolerance have limited their practical applications.To address the above issues,we design and synthesize a highly crystalline,vinyl-functionalized covalent organic framework(V-COF)rationally grafted with ether-based segments through solvent-free in situ polymerization.V-COF can afford a fast Li+conduction highway along the one-dimensional nanochannels and improve the high-voltage stability of ether-based electrolytes due to the rigid and electrochemically stable networks.The as-formed solid-state electrolyte membranes demonstrate a superior ionic conductivity of 1.1×10^(−4)S cm^(−1)at 40℃,enhanced wide electrochemical window up to 5.0 V,and high Young's modulus of 92 MPa.The Li symmetric cell demonstrates ultralong stable cycling over 600 h at a current density of 0.1 mA cm^(−2)(40℃).The assembled solid-state Li|LiFePO4 cells show a superior initial specific capacity of 136 mAh g^(−1)at 1 C(1 C=170 mA g^(−1))and a high capacity retention rate of 84%after 300 cycles.This study provides a novel and scalable approach toward high-performance solid ether-based lithium metal batteries.
基金
Shanghai Science and Technology Commission,Grant/Award Numbers:21010503100,20ZR1438400,22ZR1443900
National Natural Science Foundation of China,Grant/Award Numbers:51971146,5191147,21905174
Shanghai Outstanding Academic Leaders Plan
Innovation Program of Shanghai Municipal Education Commission,Grant/Award Number:2019-01-07-00-07-E00015
Shanghai Rising-Star Program,Grant/Award Numbers:20QA1407100,21QA1406500。
