What is lithium battery aging? Causes of aging of lithium batteries

Lithium battery aging generally refers to the placement of the battery after the first charge after the packaging is completed. It can be room temperature aging or high temperature aging. All functions are to stabilize the performance and composition of the SEI film formed after the initial charge. The aging temperature at room temperature is 25°C, and high-temperature aging plants are different, some are 38°C and 45°C. There are two cases of aging between 48 and 72 hours and separate sealing: Regarding the battery that forms the opening, the relative humidity is controlled below 2% at room temperature, and the sealing effect is better after aging. Regarding high temperature aging, the sealing aging effect is better. But what is certain is that there are electrochemical dynamic changes during the aging process, which is of great help to the stability of the SEI and can promote the stability of the electrochemical system. The purpose of aging is actually the principle. One of the reasons is to fully infiltrate the electrolyte, and the other is that certain active components of the living cathode material can make the performance of the entire battery more stable through certain deactivation reactions. The process is faster. High temperature aging is used. High temperature aging should pay attention to the control time and temperature. However, due to high temperature aging, the degradation effect of living substances exceeding the normal temperature aging can occur. It is well controlled and the effective ingredients are fully reflected. The battery characteristics are stable and the control is not Good, so the electrical performance is reduced, the output is low, the addition of infrared, even leakage and other conditions are very likely to make the battery performance more stable after high temperature aging. In the processing process of most lithium battery manufacturers, high-temperature aging operations are used. The temperature is 45~50℃, and the battery ages for 1~3 days. After high-temperature aging, the potential undesirable phenomena of the battery will be exposed: voltage changes, thickness changes, internal resistance changes, etc. are all comprehensive indicators for directly testing the safety and electrochemical performance of this batch of batteries. At present, most battery companies use domestic low-quality separators for mass production. High temperature aging has also become an unwritten rule for safety testing of battery internal structure. High temperature aging is only to shorten the entire processing cycle of the battery. Players enter the battery only at high temperature to accelerate the chemical reaction. The battery is not more than the benefits that may damage the battery, it is best to incubate at room temperature for more than three weeks, we are negative, the separator, sufficient electrolyte balance and other chemical reactions, and then the battery performance is more realistic. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.