Kwanza, foil ya alumini ya betri has good conductivity, soft texture and low price. Kama sisi sote tunajua, the working principle of lithium battery is an electrochemical device that converts chemical energy into electrical energy. Katika mchakato huu, we need a medium to transfer the electrical energy converted by chemical energy. Hapa, we need conductive materials. Among ordinary materials, metal materials have the best conductivity, while among metal materials, copper foil and aluminum foil are cheap and have good conductivity. Wakati huo huo, in lithium batteries, we mainly have two processing methods: winding and lamination.
Compared with the winding, the pole piece used to prepare the battery needs to have certain flexibility to ensure that the pole piece will not break during winding. Among the metal materials, copper aluminum foil is also a soft metal. Hatimaye, the battery preparation cost is considered. Relatively speaking, the price of copper and aluminum foil is relatively cheap, and the world is rich in copper and aluminum resources.
Pili, copper aluminum foil is also relatively stable in air. Aluminum easily reacts with oxygen in the air, forming a dense oxide film on the aluminum surface layer to prevent further reaction of aluminum, and this thin oxide film also has a certain protective effect on aluminum in the electrolyte. Copper itself is relatively stable in air and does not react in dry air.
Cha tatu, the positive and negative potential of lithium battery determines that aluminum foil is used for the positive electrode and copper foil is used for the negative electrode, rather than vice versa. With high positive potential, copper foil is easy to be oxidized at high potential, while aluminum has high oxidation potential, and there is a dense oxide film on the surface of aluminum foil, which also has a good protective effect on the internal aluminum.
Ikiwa unataka kununua foil ya alumini ya betri, tafadhali wasiliana nasi.