| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-aqueous electrolyte secondary battery which has a high capacity, superior cycle characteristics, and superior safety at high temperature. <P>SOLUTION: The non-aqueous electrolyte secondary battery has a structure in which a positive electrode active material is a mixture of a lithium cobalt composite oxide represented by Li<SB>a</SB>Co<SB>1-x-y-z</SB>Zr<SB>x</SB>Mg<SB>y</SB>M<SB>z</SB>O<SB>2</SB>(wherein M is at least one of Al, Ti, and Sn; 0<a≤1.1; 0.0001≤x; 0.0001≤y; and x+y+z≤0.03) with a lithium nickel manganese composite oxide having a lamellar structure represented by Li<SB>b</SB>Mn<SB>s</SB>Ni<SB>t</SB>Co<SB>u</SB>X<SB>v</SB>O<SB>2</SB>(wherein X is at least one of Zr, Mg, Al, Ti, and Sn; 0<b≤1.1; 0.1≤s≤0.5; 0.1≤t≤0.5; v=0 or 0.0001≤v≤0.03; and s+t+u+v=1), a potential of the positive electrode active material is 4.4 to 4.6 V based on lithium, an air permeability of a separator is ≥60 seconds/100 ml and ≤400 seconds/100 ml, and a porosity is less than 60%. <P>COPYRIGHT: (C)2010,JPO&INPIT |
