| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive lithium secondary battery having high energy density and high safety without easily causing capacity deterioration even in storing the battery in a high-temperature atmosphere. SOLUTION: This lithium secondary battery is provided with a negative electrode comprising copper foil and a negative electrode mix layer formed on the copper foil and having a density of 1.4-1.8 g/cm<3> , a positive electrode comprising aluminum foil and a positive electrode mix layer formed on the aluminum foil and having a density of 3.3-3.7 g/cm<3> , and a nonaqueous electrolyte. The negative electrode mix layer comprises graphite and graphatization retarding carbon. The positive electrode mix layer is formed of at least one kind selected from among a group comprising an active material (a) comprising LiMn2 O4 and LiNiO2 , an active material (b) formed of LiMnx Ni1-x O2 , an active material (c) comprising LiMn2 O4 , LiNiO2 and LiCoO2 , and an active material (d) formed of LiMny Niz Co1-y-z . |
