How long is the service life of lithium ion battery?

In the 1970s, M.S. Whittingham proposed and began to study lithium ion batteries. It is concluded that the chemical properties of lithium metal are very active, which is particularly prone to chemical reactions, so the processing, storage and use of lithium metal have very high environmental requirements. Similarly, the storage environment of lithium ion batteries greatly affects the performance and life of lithium ion batteries.

1. Self discharge of Li ion battery

As we all know, the life of lithium ion batteries is limited, usually 300-500 times. However, in fact, the life of a lithium-ion battery should be calculated from the moment it leaves the factory, not from the first use.

Lithium ion batteries are in the process of self discharge before use. The self discharge of lithium ion batteries is an unavoidable phenomenon for all lithium ion batteries. The self discharge of lithium ion battery is affected by the ambient temperature and humidity. High and low temperatures will accelerate the self discharge of the battery. It is recommended to store the battery in a dry environment of 0 ℃~20 ℃. The life of a lithium-ion battery depends on the production date on its package.

2. Chemical decomposition of lithium ion battery

Lithium ion battery is a complex chemical reaction system, which is mainly composed of positive and negative materials, electrolyte, diaphragm and other materials. In addition to the main reaction of lithium ion, there are also some other side reactions, such as electrolyte decomposition, active substance dissolution, etc. The internal balance of lithium-ion batteries that have been put aside for a long time will be affected.

Generally, do not mix the battery with metal objects to avoid metal objects touching the positive and negative electrodes of the battery, causing short circuit, damage to the battery and even danger. Lithium ion batteries should be stored in a ventilated and dry environment away from high temperatures and ignition sources to prevent high temperatures and humidity from affecting the performance of lithium ion batteries and corroding the surface.

In addition, most mobile phones or tablets only use a single battery instead of multiple battery packs, which also provides a wider acceptable range for battery performance, while some batteries with poor performance are ignored.

As with mechanical equipment that is overloaded, deep discharge will also reduce the number of battery cycles. Therefore, shortening the discharge time is conducive to prolonging the battery life. In addition, we should try our best to prevent full discharge or frequent charging of the battery. Incomplete discharge is beneficial to lithium ion batteries. Lithium ion batteries have no memory effect. Do not periodically discharge completely to prolong battery life. However, there are exceptions, such as fuel gauges or intelligent devices that need to be calibrated regularly.

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