What are the reasons why the capacity decline of ternary lithium-ion batteries is important?

Ternary lithium-ion batteries are the fastest growing secondary batteries after nickel-cadmium batteries and nickel-hydrogen batteries. The application of lithium-ion batteries is very popular depending on the invariance of its charge and discharge cycle. In communication with other secondary batteries, lithium-ion batteries are unprepared for capacity decay during the cycle. High-rate charging and discharging will also cause the capacity loss of ternary lithium-ion batteries. This is because the positive and negative electrodes will shrink and expand in volume during the charging and discharging process. The greater the charge and discharge current, the more violent the contraction and expansion, and the greater the stress. The particles of the negative electrode are more likely to be split during rapid changes in volume and may be peeled from the current collector, resulting in accelerated cycle attenuation. Temperature is definitely one of the key factors affecting the life of ternary lithium-ion batteries. Too high temperature or too low temperature in cities causes a decrease in active lithium ion content, thereby eliminating lithium-ion battery life. The essence that affects the capacity degradation of ternary lithium-ion batteries is the low content of lithium ions that can be extracted. The main factors are the crushing or deactivation of the positive and negative materials, the analysis of electrolyte, the abuse of lithium-ion batteries, and so on. The charging and discharging process of the battery is a huge electrochemical process, and the factors that cause the battery capacity decay are not single, and the deterioration of one aspect may stimulate other factors to coordinate the influence of the battery's capacity, cycle performance, energy density, etc. The theoretical life of ternary lithium-ion batteries is about 800 cycles, which is medium among commercial rechargeable lithium-ion batteries. The lithium iron phosphate battery is about 2,000 times, and the lithium titanate is said to be able to reach 10,000 cycles. At present, mainstream battery manufacturers in the specifications of the ternary battery cells produced more than 500 times (charge and discharge under standard conditions), but after the batteries are assembled into lithium-ion battery packs, due to consistency issues, the most important thing is voltage It can't communicate completely with internal resistance, and its reincarnation life is about 400 times. The manufacturer recommends that the SOC use window is 10%~90%, and deep charging and discharging are not initiated, otherwise it will cause irreversible damage to the positive and negative electrode layout of the battery. If shallow charge and shallow discharge are used, the cycle life will be at least 1000 times. According to the current skill level of the ternary lithium-ion battery, if used properly, it can be used on electric vehicles for at least 5 years. If used improperly, the life of the lithium-ion battery will decay in 2-3 years. The so-called proper use, it is important to see whether the ternary lithium-ion battery can comply with the principle of shallow charge and shallow discharge, and not to use it too much. The life of a ternary lithium-ion battery, theoretically speaking, the life of a ternary lithium-ion battery is 2000 cycles of charging and discharging, and we count it as one charge per day, which can last for more than 5 years. However, the actual use is different from the theory as usual. If 1,000 charge-discharge cycles are held, the ternary lithium-ion battery has actually attenuated by 50%, which means that it can only run half of the original mileage if it is fully charged. 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: What is the difference between energy storage lithium-ion battery pack and power lithium-ion battery?