| 摘要 |
PROBLEM TO BE SOLVED: To make binders abundant on an interface with a current collecting body in active material layers, and realize high capacity and high energy density by arranging a part in which a binder quantity is less than the interface with the current collecting body in at least one active material layer of a positive electrode and a negative electrode. SOLUTION: A negative electrode 3 is formed as a layer structure that first, second and third negative electrode active material layers 7a, 7b and 7c are layered in order on a current collecting body 6. In the first negative electrode active material layer 7a, a negative electrode active material and a binder are mixed together in the ratio of 85:15 in the weight ratio, and a thickness is set to 10μm. In the second negative electrode active material layer 7b, a negative electrode active material and a binder are mixed together in the ratio of 90:10 in the weight ratio, and a thickness is set to 20μm. In the third negative electrode active material layer 7c, a negative electrode active material and a binder are mixed together in the ratio of 95:5 in the weight ratio, and a thickness is set to 70μm. Therefore, a rate of active materials occupied in the active material layers of the electrode is increased, and a battery on which high capacity and high energy density are realized can be obtained. |
