Electrolyte, electrode assembly, and battery comprising same

A method for preparing an electrolyte, the method comprising:

• (S1) preparing a mixture comprising a polymer mixture including a polyethylene(PEO)-based copolymer containing crosslinkable functional groups and a non-crosslinkable PEO-based copolymer, and a ceramic compound;
• (S2) performing a crosslinking reaction of the PEO-based copolymer containing crosslinkable functional groups included in the mixture such that at least some of the crosslinkable functional groups of the PEO-based copolymer form crosslinks with each other;
• and
• (S3) vapor-depositing a polar compound onto the result product formed in (S2) including the crosslinked PEO-based copolymer such that the polar compound is contained in the polymer mixture.

A method for preparing an electrolyte, the method comprising the steps of:

• (S1) preparing a mixture comprising a polyethylene oxide-based copolymer containing a crosslinkable functional group, a crosslinking agent, and a ceramic compound, wherein the mixture comprises a weight ratio of crosslinking agent to polyethylene oxide-based copolymer expressed as:
• f
• XL
• =
• W
• XL
• W
• P
• ,
• wherein WXL is the weight of the crosslinking agent, WP is the weight of the polyethylene oxide-based copolymer, and fXL is 0.07 to 0.19;
• (S2) polymerizing the mixture, wherein the polymerization comprises at least a portion of the crosslinkable functional groups forming crosslinks with the crosslinking agent, and the resulting polymer is in the form of a network structure;
• and
• (S3) vapor-depositing a polar solvent onto the polymer prepared in steps (S1)-(S2).