What are the main reasons for the self-discharge of lithium-ion batteries?

The physical micro-short circuit is the direct cause of the low voltage of the lithium-ion battery, which directly indicates that the battery voltage is lower than the normal cut-off voltage after the battery has been stored at room temperature and high temperature for a period of time. Compared with self-discharge caused by chemical reverberation, self-discharge caused by physical micro-short circuit will not cause irreversible loss of lithium-ion battery capacity. 2. Chemical reverberation a. Moisture causes the electrolyte to resolve and releases a large amount of electrons. The electrons are then embedded in the anode oxidation layout, which causes the anode potential to drop, resulting in low voltage; in addition, moisture is a catalyst in the entire battery, which will generate a lot of The strong Lewis acid continuously corrodes the SEI film and consumes the lithium source and causes low battery voltage. b. Electrolyte solvents Some electrolyte solvents will cause the voltage of the lithium-ion battery to drop too fast. The general mechanism: these solvents are not resistant to oxidation and produce dull chemical reactions during the storage process, which will deplete the capacity and cause the voltage to drop. c. The SEI film is not formed well. During the storage process, because the inn has a certain temperature, it causes the SEI film to fall off and reverberate, resulting in flatulence and low pressure in the lithium ion battery. d. Poorly packaged tab position is too sealed, which may cause the tab to corrode and consume the low voltage of the lithium source; in other positions, the electrolyte may penetrate the CPP layer to corrode the aluminum foil, causing the aluminum-plastic film to perforate and enter the moisture to cause low pressure flatulence. 3. Temperature conditions The higher the temperature, the higher the activity of the electrochemical materials of the lithium-ion battery. The positive electrode material, negative electrode material, electrolyte, etc. of the lithium-powered lithium battery will have more violent repercussions. During the communication period, Cause more capacity loss. The chemical self-discharge of lithium-ion batteries is more pronounced at high temperatures, and high-temperature storage is used to determine that the self-discharge of lithium-powered lithium batteries is more effective. 4. The amount of charge is to compare the impact of the charge of the lithium-ion battery on the self-discharge rate. The overall trend is that the higher the charge of the lithium-ion battery, the higher the self-discharge rate. That is, the higher the charge of the lithium ion battery, the higher the positive electrode potential, the lower the negative electrode potential. 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: Can lead-acid batteries be used in parallel with lithium-ion batteries?