| 摘要 |
PURPOSE:To improve various characteristics by mixedly using sodium-lead alloys with multiple compositions for a negative electrode. CONSTITUTION:In a nonaqueous electrolyte secondary battery using a sodium- lead alloy, or a composite body of a sodium-lead alloy, a carbon material and a binder, or a composite body of a sodium-lead alloy, a conducting polymer material and a binder for a negative electrode, sodium-lead alloys with two different compositions: one having the sodium atomic ratio 2.5 or above against lead 1 and the other having the sodium atomic ratio less than 2.5 against lead 1, are mixedly used to form the negative electrode with the sodium atomic ratio 0-4.0 against lead 1. When this negative electrode is used, a secondary battery with improved characteristics such as high energy density, a long cycle life and a low self-discharge rate is obtained. |
