| 摘要 |
PURPOSE:To prevent a short circuit and to improve the discharge property by providing a negative electrode mainly of a hydrogen storage alloy shown as a specific general expression, a positive electrode mainly of a Ni compound, and a separator which consists of a specific nonwoven fabric. CONSTITUTION:A separator 3 consists of a dry nonwoven fabric made by laminating and integrating a parallel web and a cross web with the weight ratio of the parallel web 50 to 80%, and the weight per area 30 to 70mg/m<2>. As a result, the fiber weight per a specific area is made even, and clearances can be reduced. Consequently, in a secondary battery which consists of an electrode group having a negative electrode 1 mainly of a hydrogen storage alloy shown as a general expression LnNixMnyAZ (where Ln is an element of a rate earth elements including La, A is Al or Co, arid the atomic ratio is 4.8<=x+y+Z<=5.4), and a positive electrode 2 mainly of a Ni compound, the Mn separated in the charge and discharge cycle does not penetrate the separator 3, and an internal short circuit can be prevented. |
