How to maintain the mobile phone lithium battery to be considered correct?

The positive electrode material of lithium battery is usually composed of lithium active compound, while the negative electrode is carbon with a special molecular structure. The most important component of the common positive electrode material is LiCoO2. When charging, the electric potential applied to the two poles of the battery forces the compound of the positive electrode to release lithium ions, which are embedded in the carbon in which the negative electrode molecules are arranged in a sheet structure. During discharge, lithium ions are precipitated from the carbon of the sheet structure and recombine with the compound of the positive electrode. An electric current appears in the movement of lithium ions. Although the chemical reaction principle is very simple, in actual industrial processing, there are many practical problems to be considered: the positive electrode material needs additives to maintain the activity of multiple charging and discharging, and the negative electrode material needs to be designed at the molecular structure level. To accommodate more lithium ions; the electrolyte filled between the positive and negative electrodes must not only remain stable, but also have good conductivity to reduce the internal resistance of the battery. Although lithium batteries rarely have the memory effect of nickel-cadmium batteries, the principle of the memory effect is crystallization, and this reaction hardly occurs in lithium batteries. However, the capacity of lithium batteries will still decrease after repeated charging and discharging, and the reasons are complex and diverse. The most important thing is the change of the positive and negative materials. From the molecular level, the hole structure on the positive and negative electrodes will gradually collapse and block; from the chemical point of view, it is the active passivation of the positive and negative materials, and the side reactions appear to be stable. Other compounds. Physically, the positive electrode material will gradually peel off. In short, the number of lithium ions that can move freely during the charge and discharge process is ultimately reduced. Overcharge and overdischarge will cause permanent damage to the positive and negative electrodes of the lithium battery. From the molecular level, it can be intuitively understood that overdischarge will cause the negative electrode carbon to excessively release lithium ions and cause its sheet structure to collapse. Charging will force too much lithium ions into the carbon structure of the negative electrode, and some of them will no longer be able to be released. This is the reason why lithium batteries are usually equipped with charge and discharge control circuits. Unsuitable temperature will trigger other chemical reactions inside the lithium battery to generate compounds that we don't want to see. Therefore, a protective temperature-controlled diaphragm or electrolyte additive is installed between the positive and negative electrodes of many lithium batteries. When the battery heats up to a certain level, the membrane pores of the composite membrane are closed or the electrolyte is denatured, the internal resistance of the battery increases until it is disconnected, and the battery no longer heats up to ensure that the battery charging temperature is normal. And can deep charging and discharging increase the actual capacity of lithium batteries? Experts clearly told me that this is meaningless. They even said that the so-called use of the first three full charge and discharge activations, in the knowledge of their two doctors, can't figure out what is necessary. But why do many people change the indicated capacity in BatteryInformation after deep charging and discharging? Will be mentioned later. Lithium batteries generally have a management chip and a charging control chip. Among them, there are a series of registers in the management chip, which store values u200bu200bsuch as capacity, temperature, ID, charging status, and discharge times. These values u200bu200bwill gradually change during use. I personally think that the use of the instructions in the instructions should be fully charged and discharged once a month or so. The important purpose should be to correct the inappropriate values u200bu200bin these registers so that the battery charging control and the nominal capacity match the actual situation of the battery. The charging control chip is critical to control the charging process of the battery. The charging process of a lithium battery is divided into two stages, the constant current fast charging stage (when the battery indicator is yellow) and the constant voltage current decreasing stage (the battery indicator flashes green. In the constant current fast charging stage, the battery voltage gradually rises to The standard voltage of the battery is then transferred to the constant voltage stage under the control chip, the voltage is no longer increased to ensure that it will not be overcharged, and the current gradually decreases to 0 as the battery power rises, and the charging is finally completed. Some pictures and content of the published article are from the Internet, if there is any infringement, please contact to delete the previous article: Introduction to the advantages of lithium iron phosphate power lithium ion battery