Crosslinked polymer electrolyte compositions

A solid polymer electrolyte composition comprising:

• a crosslinked solid ionically conductive polymer having urethane groups, urea groups, thiocarbamate groups, or combinations thereof;
• nanoparticles, wherein at least 50% of the nanoparticles have a smallest dimension less than about 50 nm;
• and
• a salt;
• wherein the crosslinked solid ionically conductive polymer is prepared from at least one polymer having a weight average molecular weight of no greater than about 300,000 and at least one polymer having a weight average molecular weight of at least about 300,000;
• with the proviso that at 20° C. there is less than about 1 wt-% liquid present in the electrolyte composition;
• and
• wherein the solid polymer electrolyte composition has an ionic conductivity of at least about 1×10−4 S/cm at 60° C.

A solid polymer electrolyte composition comprising:

• a crosslinked solid ionically conductive polymer comprising a poly(alkylene oxide) polymer having urethane groups;
• at least about 0.5 wt-% hydroxyl-functional inorganic oxide particles;
• and
• a salt;
• wherein the crosslinked solid ionically conductive polymer is prepared from at least one polymer having a weight average molecular weight of no greater than about 300,000 and at least one polymer having a weight average molecular weight of at least about 300,000;
• with the proviso that at 20° C. there is less than about 1 wt-% liquid present in the electrolyte composition;
• and
• wherein the solid polymer electrolyte composition has an ionic conductivity of at least about 1×10−4 S/cm at about 60° C.

A solid polymer electrolyte composition comprising:

• a crosslinked solid ionically conductive polymer comprising a poly(alkylene oxide) polymer having urethane groups, wherein the solid ionically conductive polymer is prepared from a polyisocyanate, a poly(alkylene oxide) polymer having an equivalent weight of about 1,000 to about 100,000, and a poly(alkylene oxide) polymer having an equivalent weight of about 150,000 to about 500,000;
• at least about 3 wt-% hydroxy-functional inorganic oxide particles;
• and
• a lithium salt;
• with the proviso that at 20° C. there is less than about 1 wt-% liquid present in the electrolyte composition;
• and
• wherein the solid polymer electrolyte composition has an ionic conductivity of at least about 1×10−4 S/cm at about 60° C.

A solid polymer electrolyte composition comprising:

• a crosslinked solid ionically conductive polymer prepared from a polymer of the formula A-(alkylene oxide)n-A, wherein A is —OH, —NH2, or —SH, and n is at least about 10, and a molar excess of a compound of the formula Z—R—T, wherein T is an organic group comprising a vinyl group, R is a divalent organic group, and Z is a functional group capable of reacting with —OH, —NH2, or —SH;
• at least about 0.5 wt-% hydroxyl-functional inorganic oxide particles;
• and
• a lithium salt;
• wherein the crosslinked solid ionically conductive polymer is prepared from at least one polymer having a weight average molecular weight of no greater than about 300,000 and at least one polymer having a weight average molecular weight of at least about 300,000;
• with the proviso that at 20° C. there is less than about 1 wt-% liquid present in the electrolyte composition;
• and
• wherein the solid polymer electrolyte composition has an ionic conductivity of at least about 1×10−4 S/cm at about 60° C.