NOVELTY - A non-aqueous electrolyte secondary battery (10) comprises electrode body containing separator interposed between negative electrode (84) which has negative electrode active material and positive electrode (64) which has positive electrode active material, non-aqueous electrolyte, and battery case (15) which accommodates electrode body and electrolyte. A film containing phosphorus and/or boron is formed on surface of negative electrode active material, and copper(I) chloride-pyridine complex is supported as gas-adsorption agent (90) by the separator.    USE - A non-aqueous electrolyte secondary battery for motor vehicle e.g. hybrid vehicle, electric vehicle, and fuel cell electric vehicle.    ADVANTAGE - Battery performance is excellent, the defined shape of battery case is maintained by suppressing increase in internal pressure of battery case, and assembled battery formed by connecting greater than or equal to 2 batteries in series can be constructed stably.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) manufacture of non-aqueous electrolyte secondary battery which involves preparing negative electrode which has negative electrode active material and positive electrode which has positive electrode material, making separator support copper(I) chloride-pyridine complex by immersing separator in solution containing the copper(I) chloride-pyridine complex as gas-adsorption agent, interposing separator between positive electrode and negative electrode to form electrode body which produces the assembly accommodated in the battery case, injecting non-aqueous electrolyte containing oxalate complex compound which contains phosphorus and/or boron as constituent element and non-aqueous solvent in the battery case, and discharging to a prescribed discharge voltage after charging to a prescribed charge voltage with respect to the assembly; and    (2) a cell which is an assembled battery of non-aqueous electrolyte secondary battery used as driving power supply of a vehicle to which it is electrically connected.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional diagram of non-aqueous electrolyte secondary battery in II-II line.    Non-aqueous electrolyte secondary battery (10)    Battery case (15)    Positive electrode (64)    Negative electrode (84)    Gas-adsorption agent (90)