金属有机框架/聚甲基丙烯酸二甲氨基乙酯凝胶电解质的辐射合成及其锂金属电池性能研究OA

Metal-organic frameworks(MOFs),as crystalline nanoporous materials,have great potential for applications in energy and separation fields.Herein,a UiO/PDME-Li composite gel electrolyte was synthesized via γ-ray radiation using dimethylaminoethyl methacrylate as the monomer,polyethylene glycol dimethacrylate as the crosslinker in the 1 mol/L LiTFSI commercial electrolyte,and the MOF material UiO-66 as an additive.The resultant composite gel electrolyte achieved an ionic conductivity of(4.65±0.10)mS/cm and exhibited good mechanical properties,with maximum compressive strain,maximum compressive stress,and compressive modulus of(60.9±1.2)％,(63.0±7.0)kPa,and(0.180±0.002)kPa,respectively.The addition of only 0.1％UiO-66 increased the Li+transference number of the electrolyte to 0.59.A Li ‖ LiFePO4 lithium metal battery assembled with the composite gel electrolyte retained a discharge specific capacity of 129 mAh/g after 200 cycles at 0.5 C,corresponding to a capacity retention rate of 95.5％.Furthermore,a pouch battery of Li4Ti5O12 ‖ UiO/PDME-Li ‖LiFePO4 fabricated via radiation-induced in-situ preparation maintained a capacity retention rate of 77.3％after 150 cycles.The Li ‖ LiFePO4 pouch battery containing the UiO/PDME-Li electrolyte continued to work normally and powered an LED bulb even after undergoing 100 cycles of 180° bending and shear damage over 50％of its area,demonstrating excellent safety performance.