Gentle Haulers of Lithium-Ion–Nanomolybdenum Carbide Fillers in Solid Polymer Electrolyte

Nanomolybdenum carbides with different morphologies and structures are inorganic fillers in solid polymer electrolytes. The matrices were polyvinylidene fluoride (PVDF) and polyvinylidene fluoride–hexafluoropropylene (PVDF–HFP). Nanomolybdenum carbides (Mo2C) reduced the energy barrier of lithium-ion transfer. The nanofiller Mo2C with a hexagonal system built the carrier channel by charge intervention for good dynamic behavior. More effective carriers between the electrode and electrolyte interface were conducive to a uniform charge distribution and even deposition of lithium ion. The ionic conductivity of the polymer electrolyte was 7.27 × 10–4 S cm–1 at room temperature with an electrochemical stability window of 4.23 V and a lithium-ion transference number of 0.63. Solid-state batteries performed 500 cycles at a high current density of 2 C, with a capacity retention rate of 51.6%, including dendrite-free lithium anodes and stable SEI films.