What should be paid attention to when charging lithium-ion batteries

Regarding the activation of newly purchased lithium-ion batteries, many claims are: the charging time should be more than 12 hours, repeated three times in order to activate the battery. This statement that the first three charging takes more than 12 hours is obviously a continuation of the statement that nickel batteries (such as nickel-cadmium and nickel-metal hydride). So this statement can be said to be misinformation at the beginning. The charge and discharge characteristics of lithium-ion batteries and nickel batteries are very different, and it can be very clear to tell you that all serious official technical documents emphasize that overcharge and overdischarge will cause lithium-ion batteries, especially liquid lithium-ion batteries. Huge damage. Therefore, charge it in accordance with the standard time and standard method, especially do not charge for more than 12 hours. So does the battery need to be activated? The answer is yes, to activate! However, this process is completed by the manufacturer, has nothing to do with the user, and the user has no ability to complete it. The real activation process of lithium-ion battery is as follows: the lithium-ion battery shell is filled with electrolyte-sealed-formed, which is constant voltage charging and then discharging. After several cycles, the electrode is fully immersed in the electrolyte and fully activated until the capacity is reached. Until the requirement is met, this is the activation process-capacity division, which means that the lithium-ion battery has already been activated by the user after leaving the factory. In addition, the activation process of some of the batteries requires the battery to be in an open state, and then seal it after activation. Unless you have battery cell production equipment, how to complete it? But why is it written in the manuals of some products that users are advised to charge and discharge the phone for the first three use? Isn't this activation? In fact, the fact is that it will take a period of time, one month or several months, after the battery leaves the factory, is sold, and then reaches the user's hands. As a result, the electrode material of the battery will be passivated, and the capacity is lower than normal at this time. Value, the use time is also shortened. But lithium-ion batteries are easy to activate, as long as 35 normal charge and discharge cycles can activate the battery and restore normal capacity. Due to the characteristics of the lithium-ion battery itself, it is determined that it has almost no memory effect. Therefore, users do not need special methods and equipment during the activation process of new lithium-ion batteries. The hazards of overcharge and overdischarge: The rated voltage of lithium-ion batteries, due to changes in materials in recent years, is generally 3.7V, and lithium iron phosphate (hereinafter referred to as iron phosphorus) is 3.2V. The final charging voltage when fully charged is generally 4.2V, and ferrophosphorus is 3.65V. The termination discharge voltage of lithium-ion batteries is 2.75V～3.0V (the battery factory gives the working voltage range or the termination discharge voltage, the parameters are slightly different, generally 3.0V, and phosphorus iron is 2.5V). Continued discharge below 2.5V (phospho-iron 2.0V) is called overdischarge. Overdischarge at low voltage or self-discharge reaction will cause the decomposition and destruction of lithium ion active materials, which cannot be reduced. Any form of overcharging of lithium-ion batteries will cause serious damage to battery performance and even explosion. Lithium-ion batteries must be prevented from overcharging during the charging process. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.