TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Material: The ion conductor structural body includes a retaining material comprising a powdery resin material, a powdery glass material, a powdery ceramic material, a nonwoven fabric, or a porous film. Preferred Composition: The retaining material is 1-50 wt.%.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The solvent is a nonprotic polar solvent from carbonates, nitrites, amides, esters, nitro compounds, sulfur compounds, or halogen compounds. The electrolyte is a lithium salt.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The solvent is a nonprotic polar solvent from ethers.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The solvent is a nonprotic polar solvent from carbonates, nitrites, amides, esters, nitro compounds, sulfur compounds, or halogen compounds. The electrolyte is a lithium salt.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The polymer matrix contains a segment of formula -(C(R3)H-(R4)C(B))- (2).R3, R4=H or less than or equal to 2C alkyl group;B=polar group from polyether group, cyano group, amino group, amido group, or carbonate group, preferably -(CH2-CH2-O)n-Z, -(CH2-CH(CH3)-O)n-Z, -(CH2-CH2-O)n-(CH2-CH(CH3)_O)n-Z, -(CH2-CH(CH3)-O)n-(CH2-CH2-O)n-Z, -(CH2-CH2-O)k-(CH2-CH(CH3)-O)n-(CH2-CH2-O)n-Z, or -(CH2-CH(CH3)_O)k-(CH2-CH2-O)n-(CH2-CH(CH3)-O)n-Z;k, m=positive integer;n=positive integer, preferably 2-100;Z=H or 1-4C alkyl. Preferred Definitions:    R3=6-22C straight chain alkyl group or alkyl benzyl group having 6-22C straight chain alkyl group, preferably 8-18C straight chain alkyl group;    A=group from -(CH2-CH2-O)-, -(CH2-CH(CH3)-O)n, or -(CH2-CH2-O)m -CH2-CH(CH3)-O)n, preferably -(CH2-CH2-O)n;    m=positive integer;    n=2-100, preferably 5-30.    The ratio between the polyether group of A and the alkyl group of R3 is 0.1-1. A ratio between the group -(CH2-CH2-O)n of a and the alkyl group of R3 is 0.05-10, preferably 0.5-5 in terms a ratio of the number of carbon of the alkyl group of R3/the number of the n of the group -(CH2-CH2-O)n- of A.    EXAMPLE - 5 parts of n-dodecylpolyethyleneglycol acrylate having 12C alkyl whose side chain having an alkyl group and a polyether group, 6 parts of polyethyleneglycol methylmethacrylate, and 0.2 part of polyethyleneglycoldimethacrylate were added to an electrolyte solution obtained by mixing 61 parts of propylene carbonate, 61 parts of ethylene carbonate and 13 parts of lithium tetrafluoroborate to obtain a mixture. The resultant mixture was heated to 40degreesC and well agitated so that the ingredients were homogenously dissolved in the solution to obtain a mixture solution. 0.002 part of azobisisobutylonitrile was added to the mixture solution. Then the mixture solution was introduced into a cell. The cell was heated at 70degreesC for 1 hour where the mixture solution in the cell was subjected to a polymerization treatment by way of polymerization reaction, where a polymerized product was afforded in the cell. The polymerized product was taken out from the cell to obtain a film-like ion conductor structural body having a size of 6 cm (width)x10 cm (length)x50 microns (thickness).