| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion polymer secondary battery having excellent adhesion and conductivity between a positive electrode collector and a positive electrode active material or a negative electrode collector and a negative electrode active material, capable of enhancing cycle capacity maintaining characteristics. SOLUTION: This improved lithium ion polymer secondary battery is equipped with a positive electrode structured by forming a positive electrode active material layer on the surface of a positive electrode collector layer, a negative electrode structured by forming a negative electrode layer on the surface of a negative collector layer, and a polymer electrolyte layer interposed between the surface of the positive electrode active material layer of the positive electrode and the surface of the negative electrode active material layer of the negative electrode, and a first closely adhering layer is interposed between the positive electrode collector and the positive electrode active material and a second closely adhering layer is interposed between the negative electrode collector and the negative electrode active material. The feature of its structure is that first and second conductive materials contained in the first and second closely adhering layers are made of a metal or a partial metal oxide having a particle diameter of 1-20 μm, and the weight ratio of a first binder to the first conductive material and that of a second binder to the second conductive material are 13/87-75/25 for each. |
