Analyze the secrets of lithium battery aging

The secret of the aging of lithium batteries The range of use of batteries has always been a concern for researchers, because no matter how big the battery is, it does not make sense not to charge it multiple times. We all know that lithium batteries will reduce the capacity when in use, but no one knows why. Recently, the US Energy Agency discovered the cause of battery aging: nano-scale crystals. Scholars have carefully studied the positive and negative materials of modern batteries and found that these materials will be directly corroded during use, but the mechanism of corrosion is not clear. The Brookhaven National Laboratory team studied high-quality nickel-oxygen cathodes under a transmission electron microscope and recorded their changes during repeated charging and discharging. The more you use it, the less you use it. Experiments have shown that when lithium ions pass through the positive and negative electrodes, they get stuck in the ion channels and react with nickel oxide to form tiny crystals. These crystals change the internal structure of the battery so that other ions cannot react effectively, thereby reducing the battery's usable capacity. Surprisingly, this weakness is random, not regular. The reason why the lithium battery is not perfect is that its components are not perfect. No matter how much we pay attention to the structure of the anode and cathode, slight damage to the crystal will occur. Just like boiling water, the uneven surface makes hot water easier to foam. It can be considered that nanocrystals appear when there is a gap in the battery data. The more you use, the less you use. The arrow on the left refers to: lithium ion channel; atomic depletion layer is shown on the right. The US Energy Agency also launched a second study on the impact of charging speed on battery capacity. They found that modern batteries are getting smaller and smaller, which in turn shortens their lifespan. The larger the battery, the faster it is charged, and the slower the formation of nanocrystals. So what can we do to prevent the emergence of nanocrystals? At least let it slow down. There is a theoretical solution. The researchers found that by using atomic deposition, they can fill in the gaps in battery data, which can at least slow the development of nanocrystals. Although this approach can alleviate the pain, it can at least allow the battery to shrink without sacrificing capacity. Of course, scholars are also thinking of ways to break crystals and regenerate old batteries. This research may be more valuable than new battery capacity. Regarding hardware, the life of products depends on their charge and discharge times. Now, with many hardware using power systems that cannot be disconnected, this research may make us no longer power slaves. 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: Why doesn't Tesla use lithium iron phosphate batteries?