原位制备含异氰基团的凝胶聚合物电解质以提升锂金属电池性能

he most promising solid polymer electrolytes are considered to be gel polymer electrolytes (GPE), and have both the high ionic conductivity of liquid electrolytes and the high safety of solid electrolytes. However, issues such as a narrow electrochemical window and poor stability continue to limit GPE\'s use in high energy density batteries. In this work, Ethoxylated trimethylolpropane triacrylate (ETPTA) and 2-Isocyanatoethyl methacrylate (IMA) was cross-linked on polyacrylonitrile (PAN) electrospun membranes to form GPE containing isocyanates. Not only does it exhibit a wide electrochemical window of 4.8 V, it also has a high ionic conductivity (σ) of 1.24 × 10-3 S cm-1 (25 ℃) and a lithium ion (Li+)In situ preparation of gel polymer electrolytes containing isocyanate groups to improve lithium metal battery performance transference number of 0.81. The presence of the isocyanic group can absorb the residual H2O and HF in the electrolyte, which can make the battery have a longer cycle life. The assembled Li||Li battery is able to operate stably for more than 2000 hours at a current density of 0.1 mA cm-2. The NCM811||Li battery still has 85% capacity retention after 300 cycles at 2C and even has a high reversible capacity of 148.3 mAh g-1 at 10C (25 C, 3~4.5 V). The GPE containing isocyanic group designed in this paper has great potential in the study of solid-state lithium batteries, making their large-scale commercial use possible.