Are ternary lithium batteries more likely to spontaneously combust than lithium phosphate batteries?

At present, there are two main forms of power battery packs, one is ternary lithium battery and the other is lithium iron phosphate battery. At present, ternary lithium battery is indeed more prone to spontaneous combustion than lithium phosphate battery.

So why are ternary lithium batteries more likely to spontaneously combust than lithium phosphate batteries? The first reason is that the ignition point of ternary lithium batteries is lower than that of lithium phosphate batteries. The spontaneous combustion temperature of ternary lithium batteries is 200°C, and the spontaneous combustion temperature of lithium phosphate batteries is 500-800°C. The spontaneous combustion temperature of ternary lithium batteries is significantly lower. Therefore, if the battery pack temperature rises due to collision or other unexpected circumstances, the ternary lithium battery will spontaneously combust faster than the lithium phosphate battery.

Furthermore, the energy density of the ternary lithium battery, which consists of four parts: positive electrode material, negative electrode material, separator and electrolyte, is greater than that of the lithium phosphate battery. Therefore, the ternary lithium battery pack with a higher energy density will be more active than the lithium phosphate battery, so if the temperature rises or encounters other situations, it is more likely to spontaneously combust.

Although ternary lithium batteries are indeed more prone to spontaneous combustion than lithium phosphate batteries, ternary lithium battery packs are small in size, light in weight, charge quickly and are durable. In addition, the current BMS system is relatively advanced, so ternary lithium batteries will remain the mainstream power battery pack for a long time to come.