Why are lithium-ion batteries becoming less and less useful?

The mobile phone lithium-ion battery is weak, and you just lose a game. The electric car owner next door is even worse than you. After buying a car for less than two years, the battery life has dropped from 400 to 300, and you can easily lose it. Trembling. Lithium-ion batteries can win the Nobel Prize, but why can't the battery capacity decline be solved? The lithium-ion battery we have seen is like this, so there is still this, but to study the reasons for the attenuation, we take the TA off and restore the most basic structure. In a lithium-ion battery, the basic structure is composed of positive and negative electrodes, electrolyte, and a separator. The positive and negative materials are responsible for storing and releasing lithium ions. The electrolyte transports lithium ions. The separator separates the positive and negative electrodes and only allows lithium ions to pass through. . When a lithium ion battery is discharged, the graphite negative electrode releases the stored lithium ions into the electrolyte. The concentration of lithium ions on the negative electrode side increases. At this time, the lithium ions will move to the positive electrode side with low concentration, and the excess lithium ions are absorbed by the positive electrode. The internal balance of the lithium-ion battery is restored again. If it is charging, the process is reversed. In theory, as long as this process has been repeated, lithium-ion batteries can be used indefinitely. But the reality is cruel. As long as the lithium-ion battery starts to charge and discharge, the positive and negative electrodes and electrolyte will be stimulated to cause chemical reactions and be consumed. The positive electrode ruptures, the negative electrode collapses, the electrolyte decomposes, and there are fewer materials for storing and transporting lithium ions. And it cannot be replenished, and the available capacity of the lithium-ion battery is reduced. Capacity decay is like long wrinkles. Under normal conditions, it is slower. We need to be more vigilant about when it will accelerate aging. The most suitable operating temperature for lithium-ion batteries is 15-35°C. If this temperature range is exceeded, the capacity decay will be greatly accelerated. In winter in the north, the temperature of lithium-ion batteries can be as low as -10°C, while in summer, the temperature and lithium-ion battery heat are dual-purpose, and the temperature of lithium-ion batteries can reach up to 60°C. According to the experimental report, the same lithium iron phosphate battery, working continuously at 55°C, has a life span of only 1/7 of that at 25°C, while at -10°C, the life span is only 1/10. Lithium-ion battery itself is a consumable, afraid of cold and heat, so when we buy an electric car, we have to choose a model with air-conditioning for the lithium-ion battery. The scientific name of this device is a thermal management system. It’s okay to choose a brand’s models with your eyes closed. In addition, if the lithium-ion battery is often used too lightly or overcharged, the capacity decay will be greatly accelerated. According to research, the current ternary lithium-ion battery is charged and discharged at room temperature (10- The cycle life of 90% cycle) is more than 3 times that of full charge (0-100%). Lithium-ion batteries are also afraid of being hollowed out. Then when we use the car, we charge 10% and stop when we charge it to 90%, so that the life of the lithium-ion battery can be greatly extended. 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 post: What are the working principles of lithium titanate batteries and lithium ion batteries?