| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery enhancing a yield and reliability, and capable of charging at high voltage of 4.4-4.6 V vs. lithium, and to provide its charging method. <P>SOLUTION: In the nonaqueous electrolyte secondary battery equipped with a positive electrode 11 having a positive active material, a negative electrode 12 having a negative active material, and a nonaqueous electrolyte having a nonaqueous solvent and an electrolyte salt, the positive active material is comprised of a lithium cobalt composite oxide to which at least zirconium and magnesium are added and a lithium nickel manganese composite oxide having layer structure. The potential of the positive active material is 4.4-4.6 V vs. lithium. The content of each iron, chromium, copper and zinc as impurity elements contained in the positive electrode mix is respectively 10ppm or less. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
