NOVELTY - A crosslinker compound is new.    USE - Used for a gel polymer electrolyte used in a gel polymer electrolyte film or solid polymer electrolyte used in a solid polymer electrolyte film, useful for an electrochemical cell (claimed) i.e. small lithium polymer secondary cells used in portable information terminals, e.g. cell phones and notebook computers, and all kinds of electronic equipments e.g. camcorders, and large capacity lithium polymer secondary cells used in power storage systems for power equalization and electric vehicles.    ADVANTAGE - (1) Is capable of resolving the electrochemical instability and the instability towards lithium salts and offers high ionic conductivity; does not have an easily attacked nitrogen or oxygen atom in the middle of a compound as in aza-ether compounds or polyalkylene oxide; and can be easily approached by bulky and soft anion such as trifluoromethane sulfone imide since the center of the nitrogen atom is exposed, thus dissociation of lithium salt is promoted, and the complex can be formed more effectively. The solid polymer electrolyte composition has excellent mechanical properties such as drawing and bending properties. The electrolyte thin film has good film-forming properties and electrochemical stabilities.    DETAILED DESCRIPTION - A crosslinker compound of formula =C(R9)-C(=O)-O-R10-v(H2C)-(R7)Si(R7)-O((R7)Si(R11)-O)u-((R7)Si((CH2)3-R8)-O)t-((R7)Si((CH2)3-N(R1)-R2)-O)n-((R7)Si((CH2)3-R3)-O)o-((R7)Si((CH2)2-Y-R4)-O)p-((R7)Si((CH2)3-Z-(CH2C(R5)HO)r-(CH2C(R6)HO)s-CH3)-O)q-(R7)Si(R7)-(CH2)v-R10-O-C(=O)-C(=)-R9 (1) is new.    R1, R2=H atom or electron withdrawing functional group consisting -SO2CF3 -CN, -F, -Cl, -COCF3, -BF3, or -SO2CN, but do not both simultaneously represent H atom;    R3=H atom or cyano group;    R4=H atom or compounds of formula (1a) or (1b);    R5, R6, R9=H atom or Me group;    R7=alkyl, alkenyl, alkyl halide, alkenyl halide, alkanol, halo, H atom, or hydroxyl group;    R8=alkyl, alkenyl, alkyl halide, alkenyl halide, or =C(R9)-C(=O)-O-(CH2-CH2-O)w-;    R10=-CH2-, Ph, or =CH-C(=O)-O-C(CH2-)H-CH2-O-;    R11=alkyl, alkenyl, alkyl halide, or alkenyl halide;    Y, Z=-O-, -S-, -CO-, -OCO-, -OCOO-, or -COO-;    n=1-100;    o, p, q, t, u=0-100;    r, s=0-20;    r+s=greater than or equal to1;    v=1-6; and    w=0-4.    INDEPENDENT CLAIMS are included for:    (1) a gel or solid polymer electrolyte comprising (1); and    (2) an electrochemical cell comprising an anode, a cathode, and electrolyte.    DESCRIPTION OF DRAWING(S) - The figure is a graph showing a property of ionic conductivity of the solid polymer electrolytes.