NOVELTY - A linear siloxane compound having an amine substituted with electron withdrawing group or at least one of polyalkylene oxide group, cyano group and propylene carbonate group as side branch in addition to the amine substituted with electron withdrawing group is new.    USE - In an electrolyte e.g. non-aqueous liquid electrolyte, gel polymer electrolyte and solid polymer electrolyte; in electrochemical cell, gel polymer electrolyte film and solid polymer electrolyte film (claimed); as an additive for enhancing lithium cycling performance and efficiency of liquid electrolytes for high-capacity lithium-ion batteries and cells; in small lithium polymer secondary cells used in portable information terminals e.g. cell phones, notebook computers and electronic equipments e.g. camcorders and large capacity lithium polymer secondary cells for power storage systems used in power equalization and electric vehicles.    ADVANTAGE - The compound is a potent anion receptor which when added to the electrolyte enhances ionic conductivity and cation transference number of electrolytes thereby increasing electrochemical stability of alkali metal batteries. The compound is capable of resolving the electrochemical instability and the instability towards lithium salts and offers enhanced ionic conductivity by designing compound, which does not have an easily attackable nitrogen atom in the middle of a compound as in aza-ether compounds.    DETAILED DESCRIPTION - A linear siloxane compound of formula (I) having an amine substituted with electron withdrawing group or at least one of polyalkylene oxide group, cyano group and propylene carbonate group as side branch in addition to the amine substituted with electron withdrawing group is new.    R1 and R2=H or an electron withdrawing functional group selected from -SO2CF3, -CN, -F, -Cl, -COCF3 and -SO2CN;    R3=H or CN;    R4=H, (1,3)dioxolan-2-one-4-yl or (1,3)dioxan-2-one-4-yl;    R5 and R6=H or methyl;    R7=alkyl, alkenyl, alkyl halide, alkenyl halide, alkanol, halogen, hydrogen or hydroxy;    R8=alkyl, alkenyl, alkyl halide or alkenyl halide;    Y and Z=O, S, CO, OCO, OCOO or COO;    n=1 - 1000;    o, p, q and t=0 - 1000;    r and s=0 - 20;    r+s=at least 1.    Provided that: both R1 and R2 are not simultaneously H. INDEPENDENT CLAIMS are included for the following:    (1) an electrolyte comprising the compound (I);    (2) a non-aqueous liquid electrolyte comprising: the anion receptor of the compound (I); a nonaqueous solvent; and an alkali metal ion containing substance;    (3) a gel polymer electrolyte comprising: the anion receptor of the compound (I); a polymer support; a nonaqueous solvent; and an alkali metal ion containing substance;    (4) a solid polymer electrolyte (E1) comprising: the anion receptor of the compound (I); a polymer compound selected from net-shaped polymers, comb-shaped polymers and branched polymers, or a crosslinkable polymer; and an alkali metal ion containing substance;    (5) an electrochemical cell comprising: cathode, anode and the electrolyte containing the compound (I);    (6) a gel polymer electrolyte film manufactured using the gel polymer electrolyte; and    (7) a solid polymer electrolyte film manufactured using the solid polymer electrolyte.