Does cell phone battery also hibernate in winter?

Many people have encountered the problem that the battery is particularly not durable when using the mobile phone in winter or in a cold environment. The original mobile phone can be used for 8 hours but can only be used for six hours in winter. The main reason is that lithium batteries have lower performance in low temperature environments and smaller capacity.

Recently, yokii had the same problem, but in the spirit of the mobile phone expert, he decided to figure it out.

Through testing the data and the battery, we found a little secret about the battery of the mobile phone - in a cold environment, the capacity of the battery is reduced!

This is not a fantasy, it is true. Generally, the capacity of the battery marked by our mobile phone, such as 3000mAh, is only a theoretical value, and it is generally the result measured under ideal conditions in a 25 ° C environment.

But in fact, the capacity of the battery is greatly affected by the temperature.

At present, the mobile phone battery we use is generally a lithium battery, which is internally composed of a positive electrode, a negative electrode and an electrolyte between the positive and negative electrodes. When the battery is discharged, the negative electrode precipitates lithium ions by chemical reaction and moves to the positive electrode through the dielectric. At this time, the positive electrode is in a lithium-rich state, and the negative electrode is in a lithium-depleted state. During the process of lithium ion activity, the generated electron motion generates a current.

The temperature affects the speed of the chemical reaction of the battery. The too low temperature causes the chemical reaction of the lithium battery to be sluggish, so the current of the discharge becomes small, which directly leads to a decrease in the usable capacity of the battery.

Therefore, many times we mistakenly believe that the speed of the lithium battery in the winter is accelerated. In fact, the essence is that the battery capacity of the lithium battery itself is reduced.

Is there any way to restore the battery's power to normal levels, and at the same time, what skills can yokii use to regain your lifeless phone? If you find that your phone is out of power, you can take it indoors or put it in the room. In the warmth of the clothes, it is necessary to warm it up again, so that the mobile phone can be used again, or a simpler method is to remove the lithium battery and rub the cloth to make the temperature of the battery reach the normal temperature, so that the battery is re-powered. Put on your phone and you can use it again.

Through the study of the charging and discharging behavior of lithium batteries at different temperatures, it is found that the charging performance of lithium batteries is also significantly deteriorated with the decrease of temperature, the constant current charging time is shortened and the constant voltage charging time is increased. With the decrease of temperature, the discharge performance of lithium battery is significantly reduced, the discharge platform is significantly reduced, and the discharge capacity is significantly reduced.

The reason is that the conductivity and the ion diffusion ability of polar materials, which are not good at all, decrease with the decrease of temperature. The decrease of electrolyte conductivity at low temperature and the decrease of SEI membrane ionic transport capacity on polar material surface also lead to the increase of internal resistance of lithium battery, the decrease of lithium battery capacity in low temperature environment, the decrease of discharge voltage platform, and the decrease of output power at the same rate.

The page contains the contents of the machine translation.