| 摘要 |
Diaphragm paper, and a preparation method and an application thereof. The diaphragm paper comprises a first layer, a second layer, and a third layer, wherein the second layer is located between the first layer and the third layer; the first layer and the third layer are loose layers, of which the average aperture is larger than 10 μm and the basis weight is 5 to 30 g/m2; and the second layer is a compact layer, of which the average aperture is smaller than 5 μm and the basis weight is 2 to 15 g/m2. The compact layer has small aperture and good insulating performance, and is capable of effectively insulating a positive electrode and a negative electrode. The loose layers have good liquid permeability and electrolyte absorptivity, and can guarantee the discharge performance of a battery. The material is further advantageous in having good dimensional stability and being thin, so that a battery can achieve high capacity. |
| 主权项 |
1. A diaphragm paper, comprising a first layer, a second layer and a third layer, the second layer is located between the first layer and the third layer; wherein, the first layer and the third layer are loose layers, with an average pore size greater than 10 μm and a basis weight of 5 to 30 g/m2, each independently contains one or more materials selected from the group consisting of polyvinyl alcohol fiber, formalized polyvinyl alcohol fiber, polypropylene fiber, polyethylene fiber, ethylene-vinyl alcohol copolymer fiber, composite fiber, natural plant fiber, viscose fiber, aramid fiber and poly(p-phenylene-2,6-benzoxazole) fiber; the second layer is a compact layer, with an average pore size lesser than 5 μm and a basis weight of 2 to 15 g/m2, contains one or more materials selected from the group consisting of polyvinyl alcohol fiber, polypropylene fiber, polyethylene fiber, ethylene-vinyl alcohol copolymer fiber, composite fiber, natural plant fiber, viscose fiber, aramid fiber and poly(p-phenylene-2,6-benzoxazole) fiber having a fineness above 0.5 dtex, and fibrillated fiber. |
