| 摘要 |
PURPOSE:To improve the performance of a nonaqueous electrolyte secondary battery. CONSTITUTION:In a nonaqueous electrolyte secondary battery using a spinel lithium manganese composite oxide as the main active material in a positive electrode, to improve the cycle performance, a solid lithium-ion conductor is contained in a positive electrode as an ion conductor auxiliary agent to the main active material. LixCo1-y NiyO2 (0<x<=1.0, 0<=y<=1) known as a good lithium ion conductor is effective as the ion conductor auxiliary agent, and by mixing 5 molar% or more the lithium ion conductor based on the mole of the positive main active material to the positive electrode, the cycle performance is substantially improved. When a carbonaceous material is used in a negative electrode, the relation of the number of moles of manganese (a), the sum of the number of moles of cobalt and that of nickel (b), and the number of moles of carbon (c) contained in a negative active material layer facing to the positive electrode is set in the range of 0.12<=(a+2b)/2c<=0.17 to ensure the safety in overcharge. |
