Comparison of charge and discharge efficiency between ternary lithium battery an
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2022/06/23 10:33:48
Comparison of charge and discharge efficiency between ternary lithium battery and lithium iron phosphate battery. At present, the domestic power battery is mainly divided into two factions, according to the different cathode materials into lithium iron phosphate and ternary materials. Ternary lithium batteries also have great advantages in large charging rate and low temperature resistance.
Comparison of charge and discharge efficiency between ternary lithium battery and lithium iron phosphate battery
In addition to endurance, charging is also an important part of the actual use of electric vehicles. Ternary lithium batteries have great advantages over lithium iron phosphate batteries in charging efficiency.
At present, the most common charging method in the market is constant current and constant voltage charging. In general, constant current charging is used at the beginning of charging. At this time, the current is larger and the charging efficiency is higher. There is no significant difference in constant current ratio between ternary lithium battery and lithium iron phosphate battery when charging below 10C. When the charging rate is greater than 10C, the constant current ratio and charging efficiency of the lithium iron phosphate battery decrease rapidly.
At present, the efficiency of using better charging equipment to charge ternary lithium battery is about 95%, and the efficiency of lithium battery itself is about 99.5%. If the loss of discharge is taken into account, the efficiency of the whole charge-discharge process is about 90%. The actual use efficiency will be low.
The charge and discharge efficiency of lithium iron phosphate battery is high, which can reach more than 90% under the condition of multiple discharge. Lithium iron phosphate battery has the advantages of high efficiency output, fast charging, no pollution to the environment and so on.
Comparison of performance between lithium iron phosphate lithium battery and ternary lithium battery
● Energy density
The energy density of lithium iron phosphate battery is much different from that of ternary lithium battery. The energy density of lithium iron phosphate battery is usually between 90-120Wh/kg, while the energy density of ternary lithium battery can reach about 200Wh/kg. It can be seen that the energy density advantage of ternary lithium battery is relatively clear.
Low security
As we know, in terms of material system, the decomposition temperature of the cathode material of ternary lithium battery is about 200℃, and that of lithium iron phosphate battery is about 700℃. In the laboratory test environment, short circuit lithium iron phosphate battery monomer, basically does not appear fire, ternary lithium battery is not, in the use of ternary lithium battery, especially to put forward higher requirements for thermal management.
● Low temperature performance
Although lithium iron phosphate battery is resistant to high temperature, ternary lithium battery has better low temperature resistance, which is the main technical route for manufacturing low-temperature lithium battery. At minus 20°C, ternary lithium battery can release 70.14% capacity, while lithium iron phosphate battery can only release 54.94% capacity. The discharge platform of ternary lithium battery is much higher than that of lithium iron phosphate battery and the voltage platform starts faster.
Summary: The above is the charge and discharge efficiency comparison of three lithium battery and lithium iron phosphate battery, whether three lithium battery or lithium iron phosphate battery, each has good or bad, we can choose according to their own actual situation.
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