| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve both high energy density and high durability against high temperature when a positive electrode active material containing an iron lithium phosphate compound is used. <P>SOLUTION: A lithium secondary battery 10 includes: a positive electrode sheet 13 in which a positive electrode active material 12 is formed in a current collector 11; a negative electrode sheet 18 in which a negative electrode active material 17 is formed on a surface of the current collector 14; and a nonaqueous electrolytic solution 20 to fill between the positive electrode sheet 13 and the negative electrode sheet 18. As for this lithium secondary battery, the iron lithium phosphate compound is contained in the positive electrode active material 12, and in the negative electrode active material 17, amorphous carbon (for example, easily-graphitizable carbon) is contained within a range of 20 wt.% or more and 40 wt.% or less, and graphite is contained within a range of 80 wt.% or less and 60 wt.% or more. The specific surface area A of the negative electrode active material 17 is formed by 2.38 m<SP>2</SP>/g or more and 3.40 m<SP>2</SP>/g or less. <P>COPYRIGHT: (C)2011,JPO&INPIT |
