Patent ID: 7767339

Claim:
A method for producing a non-aqueous electrolyte secondary battery comprising the steps of: (i) mixing 100 parts by weight of a lithium-containing transition metal oxide, 0.24 to 1.5 parts by weight of a binder A comprising at least one selected from the group consisting of polyvinylidene fluoride, modified polyvinylidene fluoride, and polytetrafluoroethylene, and a dispersion medium to prepare a paste A; (ii) preparing a paste B, independent of paste A, by mixing 0.9 to 3.5 parts by weight of carbon black, 0.24 to 1.5 parts by weight of a binder B comprising at least one selected from the group consisting of hydrogenated nitrile rubber, polyacrylonitrile, a polymer including an acrylonitrile unit and a —(CH 2 ) n — structure (wherein 6<n), and an acrylic resin having a hydroxyl group, and a dispersion medium; (iii) mixing said paste A and said paste B to prepare a positive electrode material paste C, wherein, agglomerated particles of the carbon black contained in the paste C have a bulk density of not less than 0.1 g/ml and not more than 0.5 g/ml; (iv) applying said positive electrode material paste C onto a positive electrode core member and rolling and drying the resultant member to prepare a positive electrode; and (v) fabricating a battery using said positive electrode, a negative electrode and a non-aqueous electrolyte, wherein contact angle θ A between said non-aqueous electrolyte and said binder A and contact angle θ B between said non-aqueous electrolyte and said binder B satisfy the formula (1): θ B −θ A ≧15°.