Analysis of the use and advantages of aluminum foil in lithium batteries

The use of aluminum foil in lithium batteries is lithium iron phosphate coated on aluminum foil, but lithium iron phosphate is preferred. The negative electrode is copper foil coated with graphite or lithium titanate. There is a separator between the positive and negative foils, which are wound together. Put the wound positive and negative sheets (including the diaphragm) into the battery case together, inject the electrolyte, and then vacuum package to complete the single battery processing. Copper foil is not only the carrier of the negative electrode active material in the lithium battery, but also the collector and conductor of the negative electrode electrons. Therefore, it has special technical requirements, that is, it must have good conductivity and the surface can be evenly coated with the negative electrode material. It falls off and has good corrosion resistance. In order to ensure that the negative electrode material coated on the electrolytic copper foil does not fall off, a suitable binder must be added during preparation. With the rapid development of the lithium battery market, the industry predicts that the amount of aluminum foil for lithium batteries will reach about 80,000 tons by 2020. Lithium battery aluminum foil can be divided into power lithium-ion battery foil, consumer battery foil, and energy storage battery foil. Among them, power lithium-ion battery foil currently has the largest demand, accounting for more than 50%, while the consumer battery aluminum foil market is basically saturated. The industry believes that the demand for aluminum foil for power lithium-ion batteries will increase in the future, and aluminum foil for energy storage batteries will gradually increase. Advantages of aluminum foil in the field of lithium batteries 1. Extend the service life of lithium batteries. Because special aluminum foil has better physical functions, the cycle function of lithium batteries has been significantly improved. 2. Improve the consistency of the lithium battery. The use of special aluminum foil can not only reduce the internal resistance, but also improve the consistency of the internal resistance. 3. Improve the rate discharge function of the battery. After the special aluminum foil is selected, the rate function of the lithium battery advances significantly, especially in the case of a large rate (greater than 3C), the rate discharge capacity advances above 15%, perhaps in the case of the same rate Below, special aluminum foil can travel the energy density of lithium batteries. The advantages of carbon-coated aluminum foil in the use of lithium batteries: inhibit battery polarization, reduce thermal effects, improve rate performance; reduce battery internal resistance, and clearly reduce the dynamic internal resistance increase in the cycle process; improve consistency, and add lithium battery cycling Life; improve the adhesion of the active material and the current collector, reduce the manufacturing cost of pole pieces; protect the current collector from corrosion by the electrolyte; improve the production performance of lithium iron phosphate and lithium titanate materials. The performance advantages of carbon-coated aluminum foil/copper foil: Significantly improve the consistency of the battery pack, greatly reducing the cost of the battery pack; improve the adhesion of the active material and the current collector, the material is soft, easy to produce, and the pole piece manufacturing cost is reduced; Polarization, increase the rate and gram capacity, improve the performance of lithium batteries; protect the current collector, and extend the service life of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.