NOVELTY - A non-aqueous electrolytic solution secondary battery comprises a positive electrode (23); a negative electrode (24); and a non-aqueous electrolytic solution containing a halide of an element selected from zirconium (Zr) and Group 5, Group 6 and Groups 12-15 of the Periodic Table.    USE - As a portable power source for electronics devices such as camcorders, digital still cameras, cellular phones, personal digital assistants and notebook computers.    ADVANTAGE - The non-aqueous electrolytic solution secondary battery provides reduced expansion under a high-temperature atmosphere while keeping good cycle characteristics. In the non-aqueous electrolytic solution secondary battery, generation of a gas to be caused due to a reaction of an electrolytic solution and a battery active substance is suppressed due to the matter that a halide of a specified element to be contained in the electrolytic solution is decomposed on the surface of the electrode at the time of initial charge to form a protective coating of a lithium halide. Thus, the expansion of the battery at the time of high-temperature storage can be suppressed, and excellent charge-discharge efficiency can be kept.    DETAILED DESCRIPTION - A non-aqueous electrolytic solution secondary battery comprises a positive electrode (23); a negative electrode (24); and a non-aqueous electrolytic solution containing a halide of an element selected from zirconium (Zr) and Group 5, Group 6 and Groups 12-15 of the Periodic Table (preferably Group 6 and Group 13 of the Periodic Table, especially molybdenum). In the battery, a concentration of the halide in the non-aqueous electrolytic solution is 0.02-0.5 wt.%. The non-aqueous electrolytic solution further contains a carbonic ester. The positive and negative electrodes and the non-aqueous electrolytic solution are contained in an exterior member made of a laminated film. The battery contains a high-molecular compound which is swollen by the non-aqueous electrolytic solution. The halide is a chloride. An INDEPENDENT CLAIM is included for a non-aqueous electrolytic solution comprising a halide of an element selected from the group consisting of Zr and Group 5, Group 6 and Groups 12-15 of the Periodic Table.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a wound electrode body of the non-aqueous electrolytic solution secondary battery.    Positive electrode (20)    Positive electrode collector (23A)    Positive electrode active substance layer (23B)    Negative electrode (24)    Negative electrode collector (24A)    Negative electrode active substance layer (24B)    Separator (25)    Electrolyte layer (26)    Protective tape. (27)