Ternary lithium-ion battery, the theoretical cycle life is about 1500 times, in actual use, the full charge and discharge cycle is more than 800 times, and the control battery discharge in the state of 25%-75%, the actual use can reach more than 1200 times. Lithium iron phosphate battery charging and discharging cycle life can generally reach more than 2000 times, even for the car with a battery life of only 70 kilometers, 2000 cycles can also support pure electricity driving 140,000 kilometers, the only disadvantage is low energy density, low temperature attenuation is more obvious, 0 ° C capacity will be reduced by about 10%, and -20 ° C capacity will be reduced by about 30%.
The theoretical life of ternary lithium-ion batteries is about 800 cycles, which is medium in commercial rechargeable lithium-ion batteries. Lithium iron phosphate is about 2,000 cycles, while lithium titanate is said to reach 10,000 cycles. At present, the mainstream battery manufacturers promise more than 500 times in the ternary cell specifications they produce (charge and discharge under standard conditions), but after the cell is made into a battery pack, due to consistency problems, it is important that the voltage and internal resistance can not be exactly the same, and its cycle life is about 400 times.
1, ternary lithium-ion battery material cycles of about 800 times.
2, lithium iron phosphate battery cycles of about 2500 times.
3, there is a difference between the number of cycles of genuine batteries and defective batteries, genuine batteries are designed and produced according to the number of cycles in the battery manufacturer's specifications, and the number of cycles of defective batteries may sometimes be less than 50 times.
Now 3.7V 18650 general cycle life can reach 500~1000 times, 3.2V 18650 general life can reach more than 2000, of course, the premise is that the regular manufacturer of qualified batteries, if it is defective or counterfeit batteries, the life will be very short.
With the continuous development of the current ternary lithium-ion battery industry technology, the application field of lithium battery is becoming wider and wider. In the battery industry, ternary lithium-ion batteries quickly occupied the market with many advantages and gradually replaced traditional lead-acid batteries. For traditional batteries, ternary lithium-ion batteries have the advantages of long life, energy saving and environmental protection, low maintenance cost, complete charge and discharge, light weight and so on, and are loved by customers.
The remaining capacity of the lithium iron phosphate battery is 84 percent for 5000 cycles, and the remaining capacity of the terpolymer lithium ion battery is 66 percent for 3900 cycles. Compared with the cycle life, the advantages of the lithium iron phosphate battery pack are more obvious. If the remaining capacity/initial capacity =80% is taken as the end point of the test, the current 1C cycle life of the lithium iron phosphate battery laboratory is more than 3,500 times, and some reach 5,000 times, while the ternary lithium ion battery laboratory 1C cycle life is about 2,500 times.
At the point of cycle life, lithium iron phosphate battery packs have a much longer life than ternary lithium ion batteries. Under the same number of cycles, the remaining capacity of lithium-ion iron phosphate batteries is also much more than that of ternary lithium-ion batteries, in addition to the cycle life of the two batteries have a large gap, in terms of safety performance, the two are also different.
Compared from the material system, the decomposition temperature of the positive electrode material of the lithium iron phosphate battery pack is about 700 degrees Celsius, and the decomposition temperature of the positive electrode material of the ternary lithium ion battery is about 200 degrees Celsius. In the laboratory test environment, the short-circuited lithium-ion iron phosphate battery monomer will basically not catch fire. The ternary lithium-ion battery is not the same, it will be more prone to fire, so the ternary lithium-ion battery has higher requirements for thermal management, and the lithium iron phosphate battery pack has higher adaptability to temperature and is safer.
