| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery that is good in battery characteristic, especially in high-temperature cycle characteristic, by composing an adhesive high-polymer of fluororesin having a specific molecular weight and crystallizing temperature in a specific temperature range. SOLUTION: An adhesive high-polymer is a fluororesin where molecular weight is more than 2.5×105, crystallizing temperature is higher than 120 deg.C and lower than 170 deg.C. An exterior material 1 surrounds and seals an electrode group. The electrode group has a structure where a laminate comprising positive electrode 12, separators 3, and negative electrodes 13 is wound in a compressed shape. In the laminate, the separator 3, a positive electrode 12 having a positive electrode material layer 4, a positive electrode collector 5, and the positive electrode material layer 4, the separator 3, a negative electrode 13 having a negative electrode material layer 6, a negative electrode collector 7, and the negative electrode material layer 6, the separator 3, a positive electrode 12 having the positive electrode material layer 4, the positive electrode collector 5, and the positive electrode material layer 4, the separator 3, and a negative electrode 13 having the negative electrode material layer 6, the negative electrode collector 7, and the negative electrode material layer 6 are sequentially laminated. The inner surface of the exterior material 1 is adhered to an adhesive portion 8. |
