Which of the ternary lithium battery and the lithium iron phosphate battery is safer?

Lithium iron phosphate battery refers to a lithium battery that uses lithium iron phosphate as a positive electrode material. The characteristic of this type of battery is that it does not contain precious metal elements (such as cobalt, etc.). Because it does not contain precious metal materials, the raw material cost of lithium iron phosphate batteries can be compressed very low. In actual use, lithium iron phosphate batteries have the advantages of high temperature resistance, strong safety and stability, low price and better cycle performance. Unlike lithium iron phosphate, the ternary lithium battery has a high voltage platform, which means that the specific energy and specific power of the ternary lithium battery are greater under the same volume or weight. In addition, ternary lithium batteries also have great advantages in terms of high-rate charging and low-temperature resistance. Lithium iron phosphate batteries have advantages in terms of safety. At present, the energy density of a single unit has been increased to 160,170 kWh per kilogram. For example, buses use lithium iron phosphate batteries. In passenger cars, I know that many excellent companies have done a lot on the safety of ternary material batteries. Our judgment on battery safety should be based on whether it can meet the safety requirements, not the material. Ternary material lithium batteries have various formulas, and different companies have different safety standards. It cannot be simply said that ternary materials are not safe. The cell system design of ternary lithium battery and lithium iron phosphate battery is definitely different. But for the same ternary lithium battery, it is unrealistic to only strengthen the system design for poor-quality batteries. The source of safety accidents is still in the single unit, which is not enough, and it is impossible to rely on system design to ensure it. Of course, the situation of various car companies is different. Some car companies directly purchase systems from battery companies, but automakers with strong design capabilities generally do their own design. From the perspective of safety, lithium iron phosphate batteries have more advantages. For example, the nickel-cobalt-aluminum ternary material 18650 battery in the ternary material that has experienced accidents will self-heat above 180 degrees Celsius, which is difficult to control after a fire, while lithium iron phosphate The material will not release heat until 250 degrees Celsius or more. Therefore, lithium iron phosphate batteries are used in commercial vehicles, especially urban buses and buses. This is a correct choice for the development of domestic electric vehicles, and it is a good choice for people’s lives. Property safety is more guaranteed. The safety of lithium iron phosphate batteries is high, because the thermal runaway temperature of lithium iron phosphate batteries is generally above 500 degrees, and the temperature of ternary lithium batteries is less than 300 degrees. Some high nickel batteries have thermal runaway temperatures even lower than 200 degrees. In contrast, phosphoric acid The risk of spontaneous combustion of iron-lithium batteries during high-speed driving and fast charging of vehicles is low. 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 article: How to distinguish the types of batteries?