NOVELTY - A lithium-ion battery consists of negative electrode (1) containing negative electrode active material (3) including graphite and/or carbon, electroconductive auxiliary (12) including graphite and binder (11), nonaqueous electrolyte solution (9), and positive electrode (7) including positive electrode active material (5). The negative electrode active material is spherical-shaped or aggregate-shaped, and electroconductive auxiliary is sheet-shaped. The portion of edge surfaces of electroconductive auxiliary contacts the surface of negative electrode active material.    USE - Lithium-ion battery is used for electric vehicle, hybrid motor vehicle, and power supply of mobile telephone.    ADVANTAGE - The lithium-ion battery has excellent charge/discharge characteristics at low-temperature environment, and durability.    DETAILED DESCRIPTION - A lithium-ion battery consists of negative electrode containing negative electrode active material including graphite and/or amorphous carbon, electroconductive auxiliary containing graphite and binder, nonaqueous electrolyte solution, and positive electrode containing positive electrode active material which can store and release lithium. The negative electrode active material is spherical-shaped or aggregate-shaped, and the electroconductive auxiliary is sheet-shaped. The portion of edge surfaces of electroconductive auxiliary contacts the surface of negative electrode active material. The nonaqueous electrolyte solution contains solvent and additive that undergoes reductive decomposition at a voltage lower than reduction voltage of solvent.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of lithium-ion battery. (Drawing includes non-English language text)    Negative electrode (1)    Sheet-shaped electroconductive auxiliary (2)    Negative electrode active material (3)    Positive electrode active material (5)    Positive electrode (7)    Electrolyte solution (9)    Additive (10)    Binder (11)    Electroconductive auxiliary (12)