The influence of battery external use conditions on the service life of lithium-ion battery

Charging and discharging methods: At present, most of the research on charging methods of lithium-ion batteries is carried out based on the Maas theory, that is, to make the charging current as close as possible to the 'best charging curve' of the Maas theory, so as not to cause harm to the battery. Some researchers have made a comprehensive comparison of several common charging methods and found that the constant current and constant voltage charging and the stepped constant current charging method overcome the shortcomings of constant current charging and constant voltage charging. This charging method has the lowest damage to the battery. widely used. Charge-discharge rate, charge-discharge cut-off voltage: Under different charge-discharge rates, after the lithium-ion battery is cycled for the same time, the capacity attenuation loss rate of the lithium-ion battery is different. After changing the charge-discharge cut-off voltage, it is found through testing that the structure of the electrode material has also changed. The change in the structure of the positive electrode material and the thickening of the negative electrode surface film will cause a decrease in the number of lithium ions and blockage of the diffusion channel, which will cause the battery capacity to decline. Operating temperature: Different lithium-ion batteries have different optimal operating temperatures. Excessively high or low temperatures will affect the service life of the battery. Studies have shown that the capacity decay of cycling batteries at room temperature is relatively slow, while at high temperature conditions of 55°C and 65°C, the battery exhibits rapid failure behavior. When the temperature is lower than -10°C, the capacity of the battery decreases sharply. At the same time, the performance of the lithium-ion battery will deteriorate at low temperature, which is related to the decrease of the ionic conductivity of the electrolyte and the electrode material. Shelving conditions: When the lithium-ion battery is left unused, self-discharge, passivation of positive and negative materials, and decomposition of electrolyte will occur due to the nature of the battery itself. The instability of the negative electrode SEI performance will cause the negative electrode active material to rapidly decline, and it is easy to produce lithium metal precipitation. At the same time, different electrolyte components have different degrees of influence on the decline of the electrode material. 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. Previous article: Assembling lithium-ion batteries, which issues should be paid attention to!