| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery, having a high energy density, a proper cycle characteristic, and high safety. SOLUTION: In a nonaqueous electrolyte secondary battery, wherein a substance, for doping/dedoping a lithium ion, is adopted as a negative electrode 1, and a lithium composite oxide is adopted as a positive electrode 2; a nonaqueous electrolyte secondary battery is constituted by using LixMO2 as positive electrode active material, also phosphoric acid lithium hexafluoride, or boric acid lithium tetrafluoride as an electrolyte, and also adding a boric acid lithium of 0.1wt.% or more, 5.0wt.% or less, into the positive electrode. In the constitution of the LixMO2 , M: transition metals composed of one kind or more, x: 0.05 or more, and 1.10 or less; and moreover transition metals: one kind in a group, composed of the element of Co, Ni, Mn, and Fe, or the mixture of these elements. |
