Why does the capacity of the lithium battery become smaller as it is used?

In simple terms, the working principle of a lithium-ion battery is the intercalation and deintercalation of lithium ions between the positive electrode and the negative electrode during charging and discharging. u0026amp;lt;img srcu003d'uploads/allimg/200822/1633392057-0.jpg?sourceu003d1940ef5c' data-rawheightu003d'205' data-rawwidthu003d'300' classu003d'content_image' widthu003d'300'/u0026amp ;gt; For example, the anode material generally uses carbon materials such as layered graphite. With the progress of charge and discharge, the layered graphite structure will gradually collapse to a certain extent, resulting in the inability to fully intercalate or deintercalate active lithium ions, thus causing Decrease in battery capacity. The same is true for cathode materials, such as spinel lithium iron phosphate materials that are widely used commercially, and active lithium ions are lost during the cycle of lithium ions in and out of the lattice, resulting in capacity degradation. Therefore, in order to prolong the life of the lithium ion battery, when using the mobile phone, try to charge the lithium battery before the power is less than 15%, otherwise it will cause the negative carbon material to over-discharge, and then destroy the layered structure, resulting in a loss of capacity. Some pictures and content of articles published on the site are from the Internet. If there is any infringement, please contact to delete the previous article: What kind of charger is better for lithium battery electric bicycles?