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The formation of lithium dendrite is a technical problem that cannot be avoided by the lithium battery industry at present. As long as the lithium ion battery is charged and discharged, lithium dendrite will be formed when the lithium ion is reduced. And after a long time of accumulation, when the lithium dendrite grows to a certain length, it will pierce the diaphragm and cause a short circuit inside the lithium ion battery. Once the short circuit occurs inside the lithium ion battery, the lithium ion battery will be scrapped, and in serious cases, it will also threaten life safety.

In addition to process and natural factors, lithium dendrite formation can also be caused by other human factors during use

1) Technological problems: when the coating of a single motor is uneven, the weight difference between the two poles is large, or the active substance contains too many impurities, which are conducive to the formation of lithium dendrites.

2) Due to artificial over-discharge, the number and diffusion capacity of lithium ions received by the negative electrode are limited. During deep discharge, the remaining lithium ions will dissociate from the surface of the negative electrode and form lithium dendrites.

3) Natural reaction: during discharge, lithium ion is separated from the positive material, passes through the electrolyte and diaphragm, and embedded into the negative electrode. Charging will reverse this process. When the lithium ion in the negative electrode returns to the positive electrode, the negative electrode will have a local stroke space charge and lithium dendrites will appear.

Lithium dendrite is a major killer of the life of lithium-ion batteries. At present, there is no way to prevent its appearance. How to slow down the appearance of lithium dendrite when using lithium-ion batteries.

1) Good lithium-ion battery charging habits: regular, and good lithium-ion battery charging habits can slow down the occurrence of lithium dendrites. When the charge of lithium-ion battery is less than 50%, it can be considered to charge the battery. When charging, using reasonable current as much as possible will also help to slow down the occurrence of lithium dendrites. Why does fast charging accelerate the aging of lithium-ion batteries? The important thing is that high current charging will accelerate the reaction of lithium ions and the growth of lithium dendrites. Although the growth of lithium dendrite may eventually pierce the diaphragm, once it grows to a certain extent, it will increase the resistance of lithium ion batteries and affect the storage capacity of batteries.

2) Prevention of excessive discharge: For example, the lithium ion battery of mobile phones or electric vehicles, all lithium ion batteries should be prevented from using less than 20% of the power. Excessive discharge will accelerate the appearance of lithium dendrites and accelerate the aging of batteries.

3) Store in a dry and cool environment: If lithium-ion batteries need to be stored for a long time, the storage environment is also very important. Too high temperature will accelerate the aging of batteries, and storage is no exception.

In the long-term cycle of charging and discharging, the formation of lithium dendrite is one of the inevitable links of lithium ion batteries used in our daily life, and also limits the application of lithium ion batteries in many occasions. Therefore, the correct and reasonable use of lithium-ion batteries is the knowledge that all users of lithium-ion batteries should master.

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