| abstract |
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/m 2 ; 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/m 2 . 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. |