NOVELTY - An anion exchange membrane comprises silica particles, polyvinylidene fluoride polymer, and divinylbenzene polymer obtained by reacting monomer with divinylbenzene crosslinking agent and initiator.    USE - An anion exchange membrane for non-aqueous redox flow batteries (claimed).    ADVANTAGE - When used together with silica particles, polyvinylidene fluoride polymer improves physical strength and thermal stability of organic polymers, and anion exchange membrane prepared using the polymer shows reduced change in shrinkage and swelling, providing excellent dimensional stability. The polyvinylidene fluoride polymer has good properties in terms of mechanical strength, heat resistance, and chemical resistance, while securing high coulombic efficiency and high voltage efficiency.    DETAILED DESCRIPTION - An anion exchange membrane comprises silica particles, polyvinylidene fluoride polymer of formula (1), and divinylbenzene polymer obtained by reacting monomer of formula (2) with divinylbenzene crosslinking agent and initiator.    l=5000-500000;    R1=1-6C alkyl amine cation optionally substituted by 1-6C alkyl and/or OH, 1-6C alkoxyalkyl amine cation optionally substituted by 1-6C alkyl and/or OH, 1-6C acetoxyalkyl amine cation optionally substituted by 1-6C alkyl and/or OH, and/or 5-20C heteroaryl cation substituted by 1-6C alkyl in which heteroaryl contains N, O, and/or S; and    R2=H or CH3.    INDEPENDENT CLAIMS are included for:    (1) preparation of anion exchange membrane which involves dispersing silica nanopowder in 1st solvent, adding polyvinylidene fluoride (PVDF) to obtain 1st polymer mixture solution, adding monomer, crosslinking agent, and initiator to 1st polymer mixture solution, stirring resulting mixture to obtain 2nd polymer mixture solution, casting 2nd polymer mixture solution to glass plate, thermally polymerizing at 500-1000 degrees C to obtain polymer membrane, and dipping polymer membrane in tertiary amine compound or alkyl compound; and    (2) non-aqueous redox flow battery comprising positive electrolyte, negative electrolyte, and anion exchange membrane which is disposed between positive electrolyte and negative electrolyte.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a semi-interpenetrating structure composed of polyvinylidene fluoride polymer and divinylbenzene polymer.