Analysing the causes of lithium battery ageing

Causes of Lithium Battery ageing

Aging generally refers to the placement of the battery after the first charge after assembly, which can be normal temperature aging or high temperature aging, all functions are to make the performance and composition of the SEI film formed after the first charge stable.

The normal temperature aging temperature is 25℃, and the high temperature aging facilities are different, some have 38℃ and 45℃. Between 48 and 72 hours.

Aging, sealing two cases:

For batteries that form holes, the relative humidity is controlled below 2% at room temperature, and the sealing effect is better after aging.

For high temperature aging, the sealing aging effect is better.

However, it is certain that there are electrochemical dynamic changes in the ageing process, which is of great help to the stability of the SEI and can promote the stability of the electrochemical system.

Causes of lithium-ion battery ageing

Aging generally refers to the placement of the battery after the first charge after assembly, which can be normal temperature aging or high temperature aging, all functions are to make the performance and composition of the SEI film formed after the first charge stable.

The normal temperature aging temperature is 25℃, and the high temperature aging facilities are different, some have 38℃ and 45℃. Between 48 and 72 hours

Aging, sealing two cases:

For batteries that form holes, the relative humidity is controlled below 2% at room temperature, and the sealing effect is better after aging.

For high temperature aging, the sealing aging effect is better.

However, it is certain that there are electrochemical dynamic changes in the ageing process, which is of great help to the stability of the SEI and can promote the stability of the electrochemical system.

At present, most battery companies use domestic inferior diaphragms for mass production, and high-temperature aging has become an unwritten requirement for safety testing of battery internal structures.

High temperature aging is only to shorten the entire production cycle of the battery, the player only enters the battery at high temperature to accelerate the chemical reaction, the battery is not more than the benefits may damage the battery, it is best to incubate at room temperature for more than three weeks, we are negative, the separator, enough electrolyte balance and other chemical reactions, and then the battery performance is more real.

This is often the case with lithium-ion batteries because they can only be charged and discharged a limited number of times, so you should try to fully charge your phone's battery. However, I did find an experimental chart on the charge/discharge cycle of lithium-ion batteries, and the cycle life data is as follows

Cycle life :10%DOD>1000 times, 100%DOD Cycle life :>200 times, where DOD is the abbreviation for depth of discharge. As can be seen from the table, the rechargeable time is related to the depth of discharge, and the cycle life of 10%DOD is much longer than that of 100%DOD. Of course, when reduced to the actual total charge capacity: 10%*1000=100,100%*200=200.

The latter is still relatively good to fully charge and discharge, but before the idea to do some revision: under normal circumstances, you should have an appointment, according to the principle that the remaining battery power is used up before charging, but if your battery is not expected to stick to the whole day on the second day, you should start charging in time, of course, if you are willing to carry the charger back to BieLun The office.