NOVELTY - The assembly (10) has a unit cell (7a) provided with an anode (5a) and a cathode (1a). A first separator (3a) is located between the anode and the cathode. A second separator (9a) is positioned at a side of the unit cell. The first separator is coated with first binder. The second separator is coated with second binder. Content of the first binder is greater than that of the second binder. An organic-inorganic porous coating layer is formed in a side of a porous base material that is arranged with pores. The porous base material comprises a mixture of binder polymer and inorganic particle.    USE - Stack-folding-type electrode assembly for use in an electrochemical device i.e. secondary lithium battery (all claimed), that is utilized as an energy source of an electric vehicle and an electronic device e.g. mobile phone, camcorder and notebook computer.    ADVANTAGE - The gas generated during driving of a battery due to side reaction can be effectively prevented so as to improve operating performance of the battery and avoid deformation of the battery due to impact.    DETAILED DESCRIPTION - The first and second binders are polyvinylidene fluoride-hexafluoro lochia propylene, polyvinylidene fluoride-trichloroethylene, polymethyl methacrylate, polyacrylonitrile, polyvinyl pyrrolidone, polyvinylacetate, ethylene-vinyl acetate copolymer, polyethylene oxide, cellulose acetate, cellulose acetate butylate, cellulose acetate propionate, cyanoethyl polyvinylalcohol, cyanoethylcellulose, cyanoethyl sucrose, carboxyl methyl cellulose, acrylonitrile styrene butadiene copolymer or polyimide. The porous base material is polyolefin, PET, polybutyleneterephthalate, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyethersulfone, poly phenylene oxide, polyphenylenesulfide or polyethylenenaphthalete. An INDEPENDENT CLAIM is also included for an electrochemical device.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a stack-folding-type electrode assembly.    Cathode (1a)    First and second separators (3a, 9a)    Anode (5a)    Unit cell (7a)    Stack-folding-type electrode assembly (10)