| 摘要 |
PURPOSE: To provide an electrochemical secondary battery with high energy density by a method wherein a charge and discharge mechanism relies on intercalation or deintercalation between Li<+> ions in a positive and negative electrode material, and wherein an electrode structure ensures high cycle stability and good chemical resistance to an electrolyte. CONSTITUTION: A positive electrode mostly composed of lithium manganese spinel represented by LiqMxMnyOz (0<x<0.6, 14<y<2.0) can contain, for example, up to 30% Co as a metal M together with Mn. A negative electrode basically consists of carbon products, manufactured from organic compound by heat decomposition, as host material of Li<+> ions. A density of Li in a spinel grid is limited in such a manner that the value of a parameter (q) is in the range of 0 to 1.3, thus producing lithium manganese spinel having a low lithium content as positive electrode material. At the time of discharging a secondary battery, this spinel discharges most of its battery capacity at a battery voltage of 3V or more, and contributes to high cycle stability. |
