NOVELTY - A lithium ion secondary battery (20) comprises a positive electrode (22), a negative electrode (23), and a non-aqueous electrolyte solution (26). The positive electrode consists of a positive electrode active material. The negative electrode consists of a negative electrode active material comprising lithium containing transition metal nitride. The non-aqueous electrolyte solution is interposed between the positive and the negative electrode. The electrolyte solution is obtained by dissolving electrolyte containing lithium, and anion compound (1) in an organic solvent.    USE - Lithium ion secondary battery is used as power supply for electric vehicle, hybrid electric vehicle, portable terminal, portable electronic device and electric power storage apparatus.    ADVANTAGE - The lithium ion secondary battery has excellent charging/discharge characteristics.    DETAILED DESCRIPTION - A lithium ion secondary battery comprises a positive electrode, a negative electrode, and a non-aqueous electrolyte solution which conducts a lithium ion. The positive electrode consists of a positive electrode active material. The negative electrode consists of a negative electrode active material comprising lithium containing transition metal nitride. The positive electrode active material and negative electrode active material occlude and discharge lithium ion. The non-aqueous electrolyte solution is interposed between the positive electrode and the negative electrode. The non-aqueous electrolyte solution is obtained by dissolving electrolyte containing lithium, and anion compound (1) in an organic solvent.    M=transition element of group XIII, group XIV or group XV in periodic table;    b=1-3;    m=1-4;    n=0-8;    q=0 or 1;    R1=1-10C alkylene, 1-10C halogenated alkylene, 6-20C arylene, or 6-20C halogenated arylene, where alkylene and arylene optionally have substituent and hetero atom in the structure;    R2=halo, 1-10C alkyl, 1-10C alkyl halide, 6-20C aryl, 6-20C halogenated aryl, or -X3R3, where alkyl and aryl optionally have substituent and hetero atom in the structure;    X1-X3=O, S, or NR4;and    R3,R4=H, 1-10C alkyl, 1-10C alkyl halide, 6-20C aryl, or 6-20C halogenated aryl.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the lithium ion secondary battery.    Lithium ion secondary battery (20)    Positive electrode (22)    Negative electrode (23)    Non-aqueous electrolyte (28)