What are the advantages and disadvantages of ternary lithium ion batteries and lithium iron phosphate batteries?
1. Advantages of ternary lithium ion battery: Lithium ternary battery has higher energy density and better cycle performance than ordinary lithium cobalt. At present, with the continuous improvement of the formula and structure, the nominal voltage of the battery has reached 3.7V, and the battery capacity has reached or exceeded the level of lithium cobalt acid batteries. Compared with ternary lithium-ion batteries, lithium iron phosphate batteries have greater advantages in terms of cycle life. The remaining capacity of the lithium-iron-phosphate battery is 84% (5000 cycles) and 66% (3900 cycles).
2. The battery house used the remaining capacity/initial capacity=80% as the end of the test. The 1C cycle life of the lithium phosphate battery laboratory is greater than 3500 times, about 5000 times, and the 1C cycle life of the ternary lithium ion battery laboratory is about 2500 times. At this point in the cycle life, the actual life of a lithium iron phosphate battery pack is much longer than that of a ternary lithium ion battery. Under the same number of cycles, the remaining capacity of a lithium iron phosphate battery is much greater than that of a ternary lithium ion battery.
3. Comparison of the safety of lithium ternary batteries: From the perspective of the material system, the decomposition temperature of the positive electrode material for lithium iron phosphate batteries is about 700 ℃, and the decomposition temperature of the positive electrode material for lithium ternary batteries is about 200 ℃.
4. In the laboratory test environment, the short-circuit lithium iron phosphate battery cell will not catch fire. However, ternary lithium-ion batteries are different, and they are more likely to ignite. Therefore, ternary lithium-ion batteries have higher requirements for thermal management, and lithium iron phosphate batteries are more adaptable to temperature and safer.
Comparison of energy density of ternary lithium-ion batteries and lithium iron phosphate batteries.
Under normal circumstances, the energy density of a ternary lithium-ion battery is greater than that of a lithium iron phosphate battery, that is, the capacity of a battery made of ternary materials with the same volume is larger than that of a lithium iron phosphate battery.