Non-aqueous freestanding ion conductive gel for electrolyte of lithium secondary battery and preparation method thereof

A non-aqueous freestanding ion conductive gel comprising:

• a matrix comprising a hydrophobic polymer including repeating units derived from a monomer having an unsaturated double bond;
• a domain dispersed in the matrix and comprising a hydrophilic ionic liquid;
• and
• a surface active layer comprising an ionic liquid having surface activity, wherein a portion of a hydrophobic segment in a chain of the ionic liquid having surface activity is positioned in the matrix, and a portion of a hydrophilic segment in the chain is positioned in the domain,
• wherein the non-aqueous freestanding ion conductive gel is a bi-continuous structure in which the matrix is a continuous phase and the domain is a continuous phase,
• wherein the monomer having an unsaturated double bond is represented by Structural Formula 1 below,
• in Structural Formula 1,
• R1 is a C3-C20 linear or branched alkylene group and R2 is each independently a hydrogen atom or a C1-C3 linear or branched alkyl group,
• the hydrophobic polymer comprises a C3-C20 linear or branched alkylene group, and
• wherein the ionic liquid having surface activity comprises at least one selected from the group consisting of imidazolium-based ionic liquid, pyridinium-based ionic liquid, piperidinium-based ionic liquid, pyrrolidinium-based ionic liquid, phosphonium-based ionic liquid, and sulfonium-based ionic liquid.