| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery using a plurality kinds of positive electrode active materials having different particle size distributions with high safety at overcharging, yet with large initial capacity, excellent in charge and discharge characteristics, and with little generation of gas. <P>SOLUTION: The nonaqueous electrolyte secondary battery uses as a positive electrode active material a mixture of large-diameter positive electrode active material particles with a mean particle size in an arithmetic average particle size distribution D<SB>50</SB>of 15 to 30 μm and small-diameter positive electrode active material particles with a mean particle size in an arithmetic average particle size distribution D<SB>50</SB>of 1 to 8 μm, and that, with peaks of 5% or more in relative particle volumes in a particle distribution within ranges of particle diameters of 15 to 30 μm and 1 to 8 μm, respectively, and with 1, 3-dioxane, vinylene carbonate compound, and further, at least a kind of aromatic compound selected from a cyclo alkylbenzene compound and a compound having quaternary carbon adjoining a benzene ring made contained in the nonaqueous electrolyte. <P>COPYRIGHT: (C)2010,JPO&INPIT |
