| 摘要 |
PURPOSE:To prevent passing of zinc electrochemically deposited on a negative electrode through a microporous film and to increase cycle performance by making the pore size on the surface of the microporous film smaller than that on its inside. CONSTITUTION:The pore size on the surface of a microporous film is made smaller than that on its inside to prevent the contact of zinc electrochemically deposited along the pores with a positive electrode. In addition, since the pore size only on the surface is made small and that on its inside is made large, decrease in ion conductivity is extremely low. Effect on preventing dendrite growth is increased, decrease in ion conductivity is made small, and drop in mechanical strength of the microporous film is also prevented. Passing of zinc electrochemically deposited through the microporous film is prevented and cycle life is remarkably increased. |
