NOVELTY - A nonaqueous organic electrolyte has positive electrode (11) comprising positive electrode active material (11B) which can occlude and discharge lithium ion, negative electrode (12) comprising negative electrode active material (12B) which can occlude and discharge lithium ion, separator which separates positive electrode and negative electrode, and electrolyte solution comprising liquid mixture of organic solvent and lithium salt electrolyte (13). The counter charge capacity ratio of positive electrode and negative electrode is 1.1-1.35.    USE - Nonaqueous organic electrolyte is used for secondary battery e.g. lithium-ion secondary battery, for power supply of electric vehicle, fuel cell electric vehicle, and hybrid electric vehicle.    ADVANTAGE - The secondary battery formed using the nonaqueous organic electrolyte has excellent discharge capacity, and cycle characteristics.    DETAILED DESCRIPTION - A nonaqueous organic electrolyte has positive electrode comprising positive electrode active material which can occlude and discharge lithium ion, negative electrode comprising negative electrode active material which can occlude and discharge lithium ion, separator which separates positive electrode and negative electrode, and electrolyte solution comprising liquid mixture of organic solvent and lithium salt electrolyte. The counter charge capacity ratio of positive electrode and negative electrode is 1.1-1.35. The counter charge capacity ratio is calculated using the relation: (A/C = beta x (negative electrode charge capacityx alpha )/(positive electrode charge capacityx eta x T)), where alpha is the electrode surface area coefficient obtained by dividing negative electrode surface area/positive electrode surface area, which is equal to greater than 1, beta is a design coefficient, which is 0.85-1.15, and eta is the charge-discharge efficiency ratio which is the ratio of charge-discharge efficiency at 25 degrees C to charge-discharge efficiency at 55 degrees C, and T is the temperature characteristic coefficient, which is the ratio of charge capacity at 55 degrees C to charge capacity at 25 degrees C.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of lithium-ion secondary battery.    Battery element (10)    Positive electrode (11)    Positive electrode active material layer (11B)    Negative electrode (12)    Negative electrode active material layer (12B)    Electrolyte (13)