Influence of the porosity degree of poly(vinylidene fluoride-co- hexafluoropropylene) separators in the performance of Li-ion batteries

Polyvinylidenedifluorideehexafluoropropylene, (P(VdFeHFP))-based polymer electrolytes, as separators for lithium batteries, were prepared through different polymer/solvent (N,N-dimethylformamide, DMF) ratios and physicochemically investigated. Scanning electron microscopy measurements have shown a homogeneously distributed porosity within the membranes, with moderately tortuous pathways, resulting in a liquid uptake up to 77 wt.% with respect to the overall weight and conduction values above 10-3 S cm-1 at room temperature. Prolonged cycling tests, performed on Li/SneC and Li/LiFePO4 half-cells based on P(VdFeHFP) polymer electrolyte separator membranes, have evidenced nominal capacities ranging from 70% to 90% of the theoretical value with very good capacity retention and charge/discharge efficiency close at 100% even at high current rates. A capacity decay is observed at high current regime, associated to the diffusion phenomena occurring within the electrode and the polymer electrolyte separator membrane