Why do we need to dehumidify when manufacturing lithium batteries?
Lithium batteries are a type of battery that uses bai lithium metal or lithium alloy du as the negative electrode material and uses a non-aqueous electrolyte solution. Because the chemical properties of lithium metal are very active, dao makes the production, storage and use of lithium metal very demanding on the environment. Lithium, plutonium and other high-energy metals will cause fire and cause harm when the moisture in the atmosphere makes them corrode. In the current manufacturing process, the dew point of the controlled environment of the processing workshop of the lithium battery manufacturer is usually within the range of -35℃~-40℃. However, there are a large number of workers on the battery processing line, and the moisture they emit must be removed with dry gas in time. Therefore, we must continue to blow the processing area with a gas that accurately controls the dew point of -50°C to -60°C. sweep. Rotary dehumidifiers can control the relative humidity of a large number of processing areas below 1%, so that lithium batteries can be manufactured in large quantities and are no longer expensive. Rotary dehumidifier has incomparable superiority in lithium battery dehumidification. Advanced technology can solve high temperature and high humidity air. The general operating temperature range of the equipment is -20℃~50℃, and the relative humidity range is 1%~100%; at the same time; It can solve the low temperature and low humidity air that cannot be solved by cooling and dehumidification; the biggest difference between lithium batteries and traditional batteries is that its electrolyte is a non-aqueous organic electrolyte. It is the particularity of the electrolyte composition that has brought a revolutionary leap to the battery performance, but it also puts forward more stringent requirements on the processing conditions of the battery, because the electrochemical stability and electrochemical window of water are smaller than that of organic solutions. It is very easy to react with the active material of the electrode, and electrochemical side reactions will occur at the two poles when the battery is discharged. Therefore, once water is mixed into the battery, whether it is air infiltration or moisture impurities in the electrolyte solution, it will affect the active material of the battery. The stability of the battery and even the overall performance of the battery are greatly damaged. Lithium batteries generally require moisture below 104%RH, and for long-life batteries, the moisture must be lowered below 3?0-5%RH1. Excessive moisture can cause damage to battery performance. Common problems include swelling, internal micro short circuit, decreased charge and discharge performance, and shortened life. This phenomenon is common to all lithium batteries that use non-aqueous electrolytes. Therefore, the battery manufacturing process requires The control of the water-free environment during the processing is particularly strict, especially the deep dehumidification of the ambient air during the liquid filling and packaging procedure. For example, one of the quality assurance conditions of the Sony battery factory in Japan is stable working conditions and advanced environmental dehumidification and deep dehumidification technology. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: 18650 lithium battery production process