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The reasons for the aging of lithium-ion batteries

Aging generally refers to the placement of the battery after the first charge after assembly, which can be either room temperature aging or high temperature aging. All functions are to ensure the stability of the performance and composition of the SEI film formed after initial charging.

The aging temperature at room temperature is 25 ℃, and high-temperature aging plants vary, with some ranging from 38 ℃ to 45 ℃. Time between 48 and 72 hours

There are two situations: aging and split sealing:

Regarding batteries that form openings, the relative humidity should be controlled below 2% at room temperature for better sealing after aging.

Regarding high-temperature aging, sealing aging has a better effect.

But it can be certain that there are electrochemical dynamic changes during the aging process, which greatly helps to improve the stability of SEI and can promote the stability of the electrochemical system.

The purpose of aging

In fact, one of the reasons is to fully immerse the electrolyte, and the other is that some active components of the active cathode material undergo certain deactivation reactions, making the overall performance of the battery more stable. Many companies adopt high-temperature aging to make this process faster. High temperature aging should pay attention to controlling time and temperature. However, due to the fact that high-temperature aging can cause degradation effects of living substances that exceed normal temperature aging, good control is necessary, The effective ingredients fully reflect the stable and poorly controlled characteristics of the battery, resulting in a decrease in electrical performance, low production, increased infrared radiation, and even leakage and other conditions, which are very likely

The performance of the battery becomes more stable after high-temperature aging. In the production process of most lithium-ion battery manufacturers, high-temperature aging is adopted. Temperature: 45-50 ℃, battery aging for 1-3 days. After high-temperature aging, potential adverse phenomena of the battery will be exposed, such as voltage changes, thickness changes, internal resistance changes, etc., which are comprehensive indicators for directly testing the safety and electrochemical performance of this batch of batteries.

At present, most battery companies use domestically produced low-quality separators for mass production, and high-temperature aging has become an unwritten rule for internal structural safety testing of batteries

High temperature aging is just to shorten the entire production cycle of the battery. Players can only enter the battery at high temperatures to accelerate chemical reactions, which may not exceed the benefits that may damage the battery. It is best to incubate the battery at room temperature for more than three weeks. We have negative separators, sufficient electrolyte balance, and other chemical reactions, and then the battery performance will be more realistic.

Lithium ion batteries are usually in this situation because their charging and discharging times are limited, so you should try to fully charge your phone's battery as much as possible. But I found an experimental table about the charging and discharging cycles of lithium-ion batteries, and the data on cycle life is as follows:

Cycle life: 10% DOD>1000 times, 100% DOD cycle life:>200 times, where DOD is the abbreviation for discharge depth. From the table, it can be seen that the charging time is related to the discharge depth, and the cycle life of 10% DOD is much longer than that of 100% DOD. Of course, if it is reduced to the actual total charging capacity: 10% * 1000=100100% * 200=200.

The latter is still relatively better for complete charging and discharging, but some corrections should be made to the ideas in front of netizens: under normal circumstances, you should have an appointment, according to the principle, the remaining battery charge should be used up before charging. However, if your battery is expected to last for the entire day on the second day, you should start charging in a timely manner. Of course, if you are willing to bring a charger to the office when you are willing to use BieLun again.

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