Three-Dimensional Fiber Network Structure-Reinforced Composite Solid-like Electrolyte for Lithium-Metal Batteries

Solid-like electrolytes (SLEs) based on metal–organic frameworks (MOFs) have attracted much attention due to their combination of the advantages of solid electrolytes and liquid electrolytes (LEs). Most MOF-based electrolytes using organic LEs cannot fundamentally solve the safety problems of lithium-metal batteries (LMBs), and the ionic conductivity (IC) and mechanical properties of the electrolytes should be improved. In this paper, Li-containing ionic liquids-impregnated polyvinylidene fluoride-hexafluoropropylene fiber network-loaded ZIF-8 nanoparticle electrolyte film was designed. The SLEs have excellent properties such as an IC of 2.94 × 10–3 S cm–1 at 30 °C, electrochemical stability window (5.37 V), Li+ transference number (0.56), and mechanical strength. In addition, the LFP/Li battery assembled with this electrolyte has a capacity retention rate of 93.03% after 200 cycles at 0.2C. The assembled Li symmetrical battery exhibits excellent Li plating/stripping performance for 2000 h at 0.2 mA cm–2/0.1 mA h cm–2.