Why does lithium-ion battery wear out? How to fix it

Lithium-ion batteries begin to wear out from the moment they leave the factory. This is due to the chemical properties of lithium-ion batteries, that is, the internal active materials will continue to reduce their activity over time, and the parts that gradually become inactive will be lost. The purpose of storing electric energy. The reason for the attenuation of lithium-ion batteries is that lithium will react with the electrolyte during the moving process, so lithium is necessary to be lost. Of course, the performance of lithium-ion batteries will decrease with the number of charging and discharging, which is normal. Self-discharge refers to the natural loss of battery capacity in the unused state. The first is reversible capacity loss, which means that the lost capacity can be recovered during charging; the opposite is the irreversible capacity loss. The positive and negative electrodes may be Electrolyte side reactions occur, lithium insertion and extraction occur. The lithium insertion and extraction of the positive and negative electrodes is only related to the lithium in the electrolyte. Therefore, the capacity of the positive and negative electrodes is unbalanced, and this part of the capacity loss cannot be recovered during charging. Lithium-ion batteries move in different directions during charging and discharging. Lithium releases electrons when it moves, and current occurs, but lithium will react with the electrolyte during the movement, so lithium will be depleted. As the number of charging and discharging increases, the amount of lithium will decrease, and the performance of the battery will decrease. If the attenuation problem of lithium-ion batteries is to be solved, a new electrolyte must be developed to prevent lithium from reacting with the electrolyte. If the lithium ion battery is not used, the battery itself will consume power, and this process will also cause aging and oxidation, which will increase the internal resistance. In addition, the battery itself is relatively sensitive to the external environment. Temperature, humidity, changes in its own power, and degree of oxidation will all cause changes in internal lithium. As long as it is not in a completely static state, the loss is certain. Can lithium-ion battery wear be repaired? The low temperature can change the electrolyte inside the lithium-ion battery and promote the chemical reaction of the battery that has just been frozen. Put the lithium-ion battery in a low-temperature environment, the microstructure of the lithium-ion membrane on the surface of the lithium-ion battery and the electrolyte, as well as their interface will change significantly, resulting in temporary inactivity inside the battery and reduced leakage current, so after recharging The standby time will be added. Wrap the old mobile phone lithium-ion battery that will automatically shut down with plastic wrap, and try to be as compliant as possible when wrapping it. There are three layers inside and outside to ensure that the battery is in a vacuum state. Then, wrap three layers of newspapers outside the plastic wrap to completely seal the lithium-ion battery. Put it into the freezer layer of the refrigerator. After 48 hours, take out the batteries, and remove the six layers of paper film wrapped one by one. The lithium-ion battery does not cause surface expansion or deformation due to freezing. After cooling for a period of time, then charge. Lithium-ion batteries that are nearly scrapped are completely discharged and then recharged to activate the battery. The specific method is to deeply discharge the mobile phone and achieve a deeper recharge by depleting the internal power. Use a specific device to connect the mobile phone to a low-voltage light bulb, battery The internal power will be transferred to the small bulb until it is all discharged. Under normal circumstances, if the mobile phone is connected to the rated voltage of less than 3.6 volts, it will automatically shut down, and the battery of the mobile phone that is recharged after discharge can be used for a longer time. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Briefly describe the precautions for charging lithium-ion battery electric vehicles