How long is the service life of lithium battery

　　"Lithium battery" is a kind of battery with lithium metal or lithium alloy as anode material and non-aqueous electrolyte solution. In 1912, lithium metal batteries were first proposed and discussed by Gilbert N. Lewis. In the 1970s, M.S. Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and application of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium battery has become the mainstream.

　　Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain metallic lithium and can be recharged. Lithium metal battery, the fifth generation of rechargeable battery, was born in 1996. Its safety, specific capacity, self-discharge rate and performance-price ratio are better than lithium ion battery. Due to its own high technical requirements, only a few companies in several countries are producing this lithium metal battery.

　　1. How to charge a new battery

　　In the use of lithium battery, it should be noted that the battery will enter the sleep state after being placed for a period of time. At this moment, the capacity is lower than the normal value, and the use time will also be shortened. However, lithium battery is easy to activate, as long as it passes 3-5 times of normal charging and discharging

　　The electric cycle can activate the battery and restore the normal capacity. Because of its own characteristics, lithium battery has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process. Not only in theory, but from my own practice, it is the best to use the "natural activation" method of charging in a standardized way from the beginning.

　　As for the "activation" of lithium batteries, many people say that the charging time must be more than 12 hours and repeated three times in order to activate the battery. The statement that "the first three times of charging should be more than 12 hours" is obviously a continuation of nickel batteries (such as nickel cadmium and nickel hydrogen). Therefore, this statement can be said to be false at the beginning. The charging and discharging characteristics of lithium batteries and nickel batteries are very different, and I can tell you clearly that all the strict official technical data I have reviewed emphasize that overcharge and overcharge will cause great damage to lithium batteries, especially liquid lithium ion batteries. Therefore, it is better to charge according to the standard time and standard method, especially do not charge for more than 12 hours. Generally, the charging method described in the mobile phone clarification book is the standard charging method suitable for the mobile phone.

　　2. When to start charging in normal operation

　　In our forum, we often see this statement. Because the number of charging and discharging is limited, we should recharge the cell phone battery as much as possible. However, I found a test table about the charge-discharge cycle of lithium-ion batteries. The data about the cycle life is listed as follows:

　　Cycle life (10% DOD):>1000 times

　　Cycle life (100% DOD):>200 times

　　DOD is the abbreviation of discharge depth. It can be seen from the table that the number of rechargeable times is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that at 100% DOD. Of course, assuming that the relative total capacity of the actual charge is 10% * 1000=100100% * 200=200, the complete charge and discharge of the latter is still better, but the previous netizen's statement needs to be corrected: under normal circumstances, you should charge the battery according to the principle of recharging after the remaining battery power is used up, but assuming that your battery can't hold the whole day on the second day, you should start charging in time, Of course, if you are willing to carry a charger to the office, that's another matter.

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