Electrospinning of PVdF-HFP: novel composite polymer electrolytes (CPES) with enhanced ionic conductivities for lithium-sulfur batteries

A method of preparing a lithium ion conducting composite polymer electrolyte separator, comprising:

• preparing a solution, comprising:
• a polymer having one or more polar halogen groups;
• a lithium-containing solid or liquid electrolyte;
• and
• from 10 to 20 weight percent of nanoparticle filler based on total weight of the lithium ion conducting composite polymer electrolyte separator, comprising fumed silica, nanoparticle silicon dioxide, and one or more of nanoparticle titanium dioxide, nanoparticle vanadium oxide, and nanoparticle boron trioxide;
• electrospinning the solution;
• forming electrospun nanofibers;
• forming a nanofiber mat comprising multiple layers of the electrospun nanofibers;
• and
• activating the nanofiber mat comprising soaking the nanofiber mat in an activation solution comprising a liquid electrolyte.