Why is the capacity of the lithium battery lost?

1) The deposited lithium is coated on the surface of the negative electrode, blocking the insertion of lithium, and reducing the amount of recyclable lithium, resulting in a decrease in discharge efficiency and capacity loss. (2) Metal lithium is usually formed between the negative electrode and the separator, which may block the pores of the separator and increase the internal resistance of the battery. Fast charging, excessive current density, serious polarization of the negative electrode, and more distinct lithium deposition. (3) The emergence of electrochemical inert substances destroys the capacity balance between the electrodes, resulting in capacity loss, which is irreversible. (4) Self-discharge. Self-discharge refers to the natural loss of electric capacity when the battery is not in use. The capacity loss caused by the self-discharge of lithium batteries can be divided into two situations: one is the reversible capacity loss; the other is the irreversible capacity loss. Reversible capacity loss means that the lost capacity can be recovered during charging, while irreversible capacity loss is the opposite. The positive electrode and the solvent will self-discharge for micro-battery applications and cause irreversible capacity loss. (5) Electrode instability... The positive active material will oxidize the electrolyte analysis in the charged state and cause capacity loss. In addition, the factors affecting the dissolution of the positive electrode material are the structural defects of the positive electrode active material, the excessively high charging potential and the content of carbon black in the positive electrode material. Among them, the structural change of the electrode during the charge and discharge cycle is the most important factor. 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 are the advantages of lithium-ion batteries for electric vehicles compared with lead-acid batteries?