EV battery

Reasons for the decrease of lithium battery capacity

by：Vglory 2021-03-19

The capacity of the lithium battery will decrease after a certain number of cycles, and the internal resistance will increase at the same time. What caused this? Reasons for the decrease in the capacity of lithium batteries 1) Each charge and discharge will cause a part of the lithium ions to coat the surface of the negative electrode, hindering the normal insertion of lithium ions. After many cycles, it will accumulate more and more. The capacity began to drop significantly. 2) The metallic lithium formed between the negative electrode and the separator will block the pores of the separator and increase the internal resistance of the battery. 3) The inert substances produced by the electrochemical reaction inside the lithium battery will destroy the capacity balance between the electrodes, resulting in capacity loss. This loss is usually irreversible. 4) Self-discharge. Self-discharge refers to the natural loss of electric capacity when the battery is not in use. The sluggish state of the lithium battery due to storage will also cause the capacity to decrease, but this can be charged and discharged to restore the battery capacity. 5) Electrode instability. The positive electrode active material will oxidize the electrolyte and decompose in the charged state, causing capacity loss. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. How to repair lithium battery bulge?

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