Differences Between Lithium Iron Phosphate And Ternary Battery
Lithium iron phosphate battery, as one of the battery types of electric vehicles, is characterized by its relatively stable thermal stability, low production cost, long service life, and so on. However, its low temperature resistance is very low. Although the battery can be used normally at minus 10 ℃, the charging efficiency will be greatly reduced.
It is said that lithium iron phosphate is too bad in winter. In fact, lithium iron phosphate battery will attenuate more than ternary lithium battery at low temperature in winter, but not much. Under the same conditions, if the vehicle is equipped with a ternary lithium battery, the driving range will shrink by 25% due to low temperature in winter, while lithium iron phosphate is likely to reach 30%. The gap between the two is just that, not as big as the gap rumored by some people on the Internet. In addition, this gap is not entirely determined by the nature of the battery.
Differences between two type of battery:
Battery energy density is an index that affects the endurance performance of new energy vehicles. The energy density of lithium iron phosphate battery cell is only about 110Wh/kg, while that of ternary lithium battery cell is generally 200Wh/kg. That is to say, with the same weight of battery, the energy density of the ternary lithium battery is 1.7 times that of the lithium iron phosphate battery, and the ternary lithium battery can bring longer endurance for new energy vehicles.
Lithium iron phosphate battery is the power battery with the best thermal stability at present, and has absolute advantages over ternary lithium battery in terms of safety. The electrothermal peak of lithium iron phosphate battery is up to 350 ℃, and the chemical composition inside the battery needs to reach 500~600 ℃ before it starts to decompose; The thermal stability of the ternary lithium battery is very general, and it will start to decompose at about 300 ℃.
3. Charging efficiency
Ternary lithium battery has higher efficiency. The experimental data shows that there is little difference between the two when charging under 10 ℃, but the distance will be drawn when charging above 10 ℃. When charging at 20 ℃, the constant current ratio of ternary lithium battery is 52.75%, and that of lithium iron phosphate battery is 10.08%. The former is five times of the latter
4. Cycle life
The cycle life of the lithium iron phosphate battery is better than that of the ternary lithium battery. The theoretical life of the ternary lithium battery is 2000 times, but the capacity is reduced to 60% basically by 1000 cycles. Even the best Tesla in the industry can only maintain 70% of the power after 3000 times, while the lithium iron phosphate battery can still have 80% of the capacity after the same cycle.
In contrast, lithium iron phosphate battery is safety, long life and high temperature resistant; The ternary lithium battery has the advantages of light weight, high charging efficiency and low temperature resistance. Therefore, the reason for their coexistence lies in their respective adaptability to time and place.