NOVELTY - A composite polymer electrolyte (10) for lithium secondary battery, comprises a first polymer matrix (12) made of a first porous polymer with a first pore size; a second polymer matrix (14) comprising a second porous polymer with second pore size smaller than first pore size and lithium cationic single-ion conducting inorganic filler (16); and electrolyte solution (18) impregnated into the first and second polymer matrices.    USE - The composite polymer electrolyte is used for lithium secondary battery (claimed) used in electric, electronic, communication, and computer industries.    ADVANTAGE - The polymer electrolyte has excellent high rate discharge characteristics and high power characteristics by remarkably enhanced ionic conductivity, and strengthened mechanical properties. The polymer electrolyte can prevent erosion of a lithium anode and dendritic growth of lithium on a surface of the lithium anode by uniform electrolyte distribution in the second polymer matrix, thus preventing a battery short-circuit. Also, charge/discharge cycle performance and stability of a lithium metal polymer secondary battery can be remarkably enhanced. The polymer electrolyte can be manufactured in the form of an ultra-thin film. Post-injection of the electrolyte solution can simplify a manufacture process, thus increasing a process yield.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method of manufacturing a composite polymer electrolyte for a lithium secondary battery, comprising:    (1) forming a first polymer matrix made of a first porous polymer with a first pore size;    (2) synthesizing a lithium cationic single-ion conducting inorganic filler using an inorganic filler particle as a starting material;    (3) dissolving a second porous polymer with a second pore size smaller than the first pore size and the lithium cationic single-ion conducting inorganic filler in a co-solvent to prepare a mixed solution;    (4) coating the first polymer matrix with the mixed solution to form a second polymer matrix on the first polymer matrix; and    (5) impregnating the first polymer matrix and the second polymer matrix with an electrolyte solution.    DESCRIPTION OF DRAWING(S) - The figure illustrates a schematic structure of a composite polymer electrolyte for a lithium secondary battery.    Composite polymer electrolyte (10)    First polymer matrix (12)    Second polymer matrix (14)    Lithium cationic single-ion conducting inorganic filler (16)    Electrolyte solution (18)