NOVELTY - The resin composition comprises modified polymeric compound containing resin with two or more repeating units contained in high molecular compound of binder (A) and/or (B) of lithium ion polymer secondary battery, as fundamental unit of trunk polymer, and modified substance having adhesion property is arranged as branch polymer of trunk polymer.    USE - For lithium ion polymer secondary batteries.    ADVANTAGE - The resin composition has excellent adhesivity, electroconductivity, cycle capacitance maintenance property, stability and durable preservability. The corrosion of the collector by strong acid such as hydrofluoric acid produced in battery is prevented.    DETAILED DESCRIPTION - The lithium ion polymer secondary battery has anode (11) comprising anode active material layer (13) formed on surface of anode collector (12) by binder (A), and cathode (14) comprising cathode active material layer (17) formed on surface cathode collector (16) using a binder (A) or (B). An electrolyte (18) is interposed between layers (13,17). An adherence layer (19) is formed between anode collector and anode active material layer, and an adherence layer (21) is formed between cathode collector and cathode active material using binder (C). The resin composition comprises modified polymeric compound containing resin with two or more repeating units contained in high molecular compound of binder (A) and/or (B) of lithium ion polymer secondary battery, as fundamental unit of trunk polymer, and modified substance having adhesion property is arranged as branch polymer of trunk polymer. The high molecular compound is functional unit for binder (A) and/or (B), and binder (C) contains resin composition. An INDEPENDENT CLAIM is included for lithium ion polymer secondary battery.    DESCRIPTION OF DRAWING(S) - The figure shows the partial cross-sectional block diagram showing electrode component of lithium ion polymer secondary battery. (Drawing includes non-English language text).    anode (11)    anode collector (12)    anode active material layer (13)    cathode (14)    cathode collector (16)    cathode active material layer (17)    electrolyte (18)    adherence layers (19,21)