Tetragonal Li 7 La 3 Zr 2 O 12 solid electrolyte was incorporated into a PEO matrix. The highest ionic conductivity was found at an optimum composition (LLZO 52.5%). Synergetic effect on ionic conductivity was realized by combining LLZO and PEO. A LLZO solid electrolyte in PEO matrix acts as both conducting-channel and filler. a b s t r a c t The lithium ion conductivities of as-prepared composite membranes consisting of a polyethylene oxide (PEO) matrix with various contents of tetragonal Li 7 La 3 Zr 2 O 12 (LLZO) were evaluated, and the optimum composition (52.5% LLZO) was determined by performing AC impedance measurements. The ionic conductivities of the composite membranes pass through a maximum as the LLZO content varies. Therefore, the hybridization of the organic and inorganic components of these membranes results in synergetic effects on their lithium ionic conductivity. In addition, tests of Li/composite membrane/ LiNi 0.6 Co 0.2 Mn 0.2 O 2 half-cells found that their charge/discharge properties are better than those of a PEO-only membrane and a membrane containing 52.5% Al 2 O 3 instead of LLZO.
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