NOVELTY - Linear polyalkylene oxide compound having an amine substituted with electron withdrawing group, is new.    USE - In an electrolyte e.g. nonaqueous liquid electrolyte, gel polymer electrolyte and solid polymer electrolyte useful in an electrochemical cell (claimed).    ADVANTAGE - The compounds enhance ionic conductivity and cation transference number of electrolytes, thus increasing the electrochemical stability of alkali metal batteries using the electrolytes. The compounds resolve the electrochemical instability and the instability towards lithium salts, and offer enhanced ionic conductivity as they do not have an easily attackable nitrogen atom in the middle of a compound as in aza-ether compounds. The compounds thus replace the polyalkylene oxide type plasticizer.    DETAILED DESCRIPTION - Linear polyalkylene oxide compound having an amine substituted with electron withdrawing group, X-(CH(R3))m-CH(R3)(O-CH(R4)CH2)n-O-(CH(R3))m-CH(R3)-N(R1)(R2) (I), is new.    R1 and R2=H, or electron withdrawing functional group selected from -SO2CF3, -CN, -F, -Cl, -COCF3, -BF3 and -SO2CN;    R3 and R4=alkyl, alkenyl (both optionally halogenated), alkanol, halo, H or OH;    X=CH3O- or -N(R1)(R2);and    m and n=0-20.    Provided that, both of R1 and R2 are not simultaneously H, and both R3 and X do not simultaneously represent H. INDEPENDENT CLAIMS are included for the following:    (1) a nonaqueous liquid electrolyte comprising as anion receptor the compound (I); a nonaqueous solvent; and an alkali metal ion containing substance;    (2) a gel polymer electrolyte comprising as anion receptor the compound (I); a polymer matrix; a nonaqueous solvent; and an alkali metal ion containing substance;    (3) a solid polymer electrolyte, comprising as anion receptor the compound (I); a polymer compound selected from network-structured polymer, comb-shaped polymer, branched polymer, or crosslinkable polymer; and an alkali metal ion containing substance;    (4) an electrochemical cell comprising an anode, a cathode and the electrolyte;    (5) a gel polymer electrolyte film manufactured using the gel polymer electrolyte; and    (6) a solid polymer electrolyte film manufactured using the solid polymer electrolyte.