What is lithium precipitation? What is the effect of lithium precipitation on lithium batteries?
During the charging process of lithium ion battery, the lithium ion will be de-embedded from the positive electrode into the negative electrode. But when some abnormal conditions occur and cause lithium ions that are deintercalated from the positive electrode to be unable to embed the negative electrode, the lithium ion can only precipitate on the surface of the negative electrode, thus forming a gray material, which is called lithium evolution. lithium precipitation is a loss condition of lithium ion battery.
According to the general direction of lithium precipitation it can be divided into five categories: lithium precipitation caused by insufficient negative electrode allowance; lithium precipitation caused by charging mechanism; lithium precipitation caused by abnormal lithium intercalation path; lithium precipitation caused by abnormal main material; Fixed position lithium analysis caused by special reasons.
Lithium precipitation not only reduces the battery performance, greatly shortens the cycle life, but also limits the fast charging capacity of the battery, and may cause catastrophic consequences such as combustion and explosion.
