What defects will be exposed if the battery is left on the internal pole piece for a long time?

In the battery field, the self-discharge of a battery is usually evaluated by storing it at room temperature. The high temperature storage method is used to evaluate the stability of the internal chemical system and the stability of the film formation, and the evaluation is carried out by reversible capacity loss, irreversible capacity loss, internal resistance change and thickness change. It represents the matching of the positive electrode data and the negative electrode data with the electrolyte, or the adaptability of the aging process. There may not be many reasons for spot-like defects on the film. I think there are the following points: 1. A large amount of gas appears during storage, and collection bubbles appear. In this case, black spots will appear after re-discharging and charging; 2. Storage The collection bubbles that appear at the time may react with the lithium embedded in the negative electrode, causing local SEI changes, or part of the lithium salt floating on the surface of the electrode plate, white spots appear, or lithium evolution after charging and discharging; 3. Some metal impurities in the positive electrode The upper surface is oxidized and separated again on the negative electrode, causing small pitting; 4. The defects of the chip processing generally do not change during the storage process, but there are some special defects that cannot be eliminated. During the continued placement process There are exceptions, but I haven't encountered them. The production process of lithium batteries is complicated and there are many abnormalities. 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: What is the best way to charge a mobile phone?