NOVELTY - A coated active material (M1) comprises an active material that occludes and emits lithium ions; and a polymer compound that is bonded to the active material, where the polymer compound is selected from polymers having ether bonds.    USE - As coated active material in lithium ion secondary battery (claimed), where the battery is used as a battery for electric vehicle, as battery for hybrid electric vehicle in which both an engine and a secondary battery are mounted, or a plug-in hybrid electric vehicle that is directly charged from electricity delivered from an electrical grid. The lithium ion battery is also used for a stationary electric power storage system that stores power and supplies power at an emergency time when the electrical grid is blocked.    ADVANTAGE - The battery containing the material exhibits long lifetime and durability.    DETAILED DESCRIPTION - A coated active material (M1) comprises an active material that occludes and emits lithium ions; and a polymer compound that is bonded to the active material, where the polymer compound is at least of X1-(OCR2CR2)n-Y1-COO-Z (I), X1-(OCR2CR2)n-Y1-COO-Z (II), X2-(OCR2)n-Y2-COO-Z (III), or X2-(OCR2)n-Y2-COO-Z (IV).    X1=H, less than or equal to 3n hydrocarbyl, less than or equal to 3n halogenated hydrocarbyl, Z-OOC-Y1-, or Z-COO-Y1-;    X2=H, less than or equal to 2n hydrocarbyl, less than or equal to 2n halogenated hydrocarbyl, Z-OOC-Y2-, or Z-COO-Y2-;    Y1= less than or equal to 3n hydrocarbyl, less than or equal to 3n hydrocarbyl that includes an ester bond or a single bond;    Y2= less than or equal to 2n hydrocarbyl, less than or equal to 3n halogenated hydrocarbyl or single bond;    R=H or halo;    Z=an element that is present on a surface of the active material;    n= greater than or equal to 1.    INDEPENDENT CLAIMS are included for the following:    (1) a lithium ion secondary battery, comprising: a cathode that is capable of occluding and emitting lithium ions; an anode that is capable of occluding and emitting the lithium ions, where the cathode includes a cathode composite material, the anode includes an anode composite material, the cathode composite material contains a cathode active material, the anode composite material contains an anode active material, and the cathode active material or the anode active material is the coated active material (M1); and    (2) a method of manufacturing the lithium ion secondary battery involving: preparing slurry containing the coated active material and an acid anhydride of the polymer compound; and causing the coated active material and the acid anhydride to react with each other to form a bond with it; or preparing slurry containing the coated active material, and a salt of the polymer compound in which a carboxylic acid distal end of the polymer compound is set as an alkali metal or alkali earth metal salt; and forming a bond between the coated active material and the polymer compound.