Cross-linked solid-polymer electrolytes, methods of making same, and uses thereof

A solid-polymer electrolyte comprising a cross-linked polymer network, the cross-linked polymer network comprising:

• a plurality of cross-linked difunctional polyether groups independently chosen from:
• wherein in n is 0 to 250,
• a plurality of one or more non-crosslinked group(s), individual non-crosslinked group(s) having at least one terminal group not covalently bound to the cross-linked polymer network and the individual non-crosslinked group(s) covalently bonded to the cross-linked polymer network via a group comprising a thioether group;
• a plurality of cross-linked difunctional ionic groups(s) and/or one or more liquid electrolyte(s), and
• a plurality of cross-linked multifunctional crosslinker groups independently chosen from:
• wherein n is independently at each occurrence 0 to 250,
• wherein individual cross-linked difunctional polyether groups and/or individual cross-linked difunctional ionic groups(s) and individual cross-linked multifunctional crosslinker groups are covalently bonded by at least one crosslinking group comprising a thioether group, wherein each thioether group comprises a carbon-carbon bond to a cross-linked difunctional polyether group.