The energy density of ternary lithium batteries has greater development possibilities than lithium iron phosphate batteries

The energy density of ternary lithium batteries has always been more advantageous than lithium iron phosphate batteries. Although lithium iron phosphate batteries have a longer cycle life, the shortcomings of lithium iron phosphate batteries in energy density are still very obvious. At present, the capacity density of lithium iron phosphate batteries is generally around 150Wh/kg, even if done better, it is still around 160Wh/kg. Compared with the 200Wh/kg energy density of ternary batteries, there is a big gap. The reason why the ternary lithium battery is so popular is that it has a high energy density, and the cycle performance and consistency are better than that of the lithium iron phosphate battery. The energy density of ternary lithium batteries has greater development potential than lithium iron phosphate batteries. The energy density of lithium iron phosphate batteries is far less than that of ternary lithium batteries, but its safety is generally considered to be better than that of ternary lithium batteries. Let me talk about energy density first. At present, the subsidy standard for new energy vehicles depends on the energy density of the battery system. The specific policy is that when the energy density of the battery system exceeds 120Wh/kg, you can enjoy 1.1 times the subsidy, which is between 90Wh/ Only 1 times subsidy can be enjoyed between kg and 120Wh/kg. It is understood that it is not difficult for the current lithium iron phosphate batteries on the market to reach 90Wh/kg after improvement, but there are very few companies that can achieve 120Wh/kg. At present, the energy density of lithium iron phosphate batteries is generally around 150Wh/kg. Even if it is done better, it is still around 160Wh/kg. Compared with the 200Wh/kg energy density of ternary batteries, there is a big gap. The 32131 high-energy density cylindrical lithium iron phosphate battery to be produced has a single energy density of 180Wh/kg. Passenger cars using this battery can have a cruising range of more than 300km. At present, the energy density of domestic mainstream lithium iron phosphate batteries is only about 150Wh/kg. According to the analysis of domestic battery industry experts, the hope that the energy density of lithium iron phosphate batteries can reach 300Wh/kg in the next few years is very slim. High energy density is the biggest advantage of ternary lithium batteries, so a battery pack with the same weight has a larger battery capacity, and the car can run farther and faster. BYD's lithium iron phosphate battery has a single energy density of 150Wh/kg, and BYD's ternary lithium battery has an energy density of 200Wh/kg. It can be seen that the advantages of ternary lithium materials over lithium iron phosphate are still very obvious. Ternary lithium-ion power batteries have already seen the energy density of the 'ceiling'. The maximum energy density of lithium batteries with high nickel materials and carbon silicon anodes should be about 300Wh/kg, plus or minus no more than 20Wh/kg. The current single energy density of ternary lithium batteries is close to the limit, and it is difficult to make a major breakthrough. More and more domestic and foreign companies and research institutions are focusing on solid-state batteries. Taking BYD E5 as an example, the lithium iron phosphate battery version has a battery capacity of 52kWh, a weight of 517kg, and a battery life of 350 kilometers. After the replacement, the battery capacity of the ternary lithium battery reaches 61kWh, but the weight is reduced to 444kg, and the battery life is also increased to 400 kilometers. Compared with lithium iron phosphate batteries, the ternary lithium battery used in Tesla MODELS is much higher in weight energy density, about 200Wh/kg, which means that the ternary lithium battery of the same weight is higher than that of lithium iron phosphate. The battery has a longer range. However, its shortcomings are also obvious. When the temperature is 250-350°C, the internal chemical components begin to decompose. Therefore, extremely high requirements are placed on the battery management system, and a safety device must be installed for each battery. It is not difficult to find that although the lithium iron phosphate battery is slightly better in terms of high temperature resistance and cycle life, the ternary lithium battery has obvious advantages in energy density, cruising range, low temperature performance and charging efficiency, and has shown greater development. possibility. 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 are the current technical bottlenecks for power lithium battery packs?