I. Material properties determine the safety bottom line
Ternary lithium and lithium iron phosphate are like brothers with very different personalities: the former has a high energy density but a quick temper, while the latter is stable but a bit cumbersome. The cathode material (nickel-cobalt-manganese or nickel-cobalt-aluminum) of ternary
lithium batteries is more likely to release oxygen at high temperatures, just like passing a fuel to the flame. The olivine structure of lithium iron phosphate is inherently stable. Even if it is punctured, it can remain calm. This material difference directly sets the safety starting line.
Ii. Differences in critical Points of thermal runaway
Laboratory data shows that ternary lithium batteries may start to "go wild" at around 200℃, while lithium iron phosphate batteries will not "lose their temper" until 800℃. This is like two POTS of water: one boils at 80℃, while the other waits until it reaches 100℃. However, it should be noted that in actual use, the battery management system (BMS) acts like a calm butler, capable of keeping both types of batteries within the safe zone through means such as temperature monitoring and current control.
Iii. Risk Balance of Application Scenarios
Electric vehicles that pursue long range prefer ternary lithium, while energy storage power stations that focus on safety mostly choose lithium iron phosphate. This is like choosing between a sports car and an off-road vehicle - there is no absolute good or bad, only suitability or not. In daily commuting, the probability of ternary lithium batteries catching fire is actually much lower than that of mobile phone charging explosions. However, lithium iron phosphate may also "break down" in extreme environments (such as continuous fast charging at 40℃ high temperature). The key lies in the usage method and protective measures.
