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What is the Difference Between Lithium Batteries and Lithium Iron Phosphate Batteries?

May. 14, 2020

At present, there are two mainstream battery technology routes in new energy vehicles, lithium iron phosphate batteries and ternary lithium batteries. Although these two batteries compete in many application fields, competition in the field of new energy vehicles is the main line, because This is the largest lithium battery application scenario in the country. Since there is competition, there must be a comparison. The comparison of battery cost performance can be carried out through the price of the car. From the performance comparison, it is better to compare the ternary lithium battery and the lithium iron phosphate battery. By setting the conditions, the actual parameters of the two batteries are explained. According to the experiment of Power Tool Batteries Exporter, although each test inevitably has subtle differences in specific parameters, the judgment of the performance of the two batteries tends to be consistent. To this end, we take representative parameters for comparison.

LiFePO4 Battery

LiFePO4 Battery

1. Choose BYD for buses and Tesla for cars. This is the difference in volume between the two. From the current technology point of view, the energy density of ternary lithium batteries is generally 200Wh / kg, and may reach 300Wh / kg in the future; while lithium iron phosphate batteries currently basically hover at 100 ~ 110Wh / kg, and some can reach 130 ~ 150Wh / kg, but it is very difficult to break through 200Wh / kg. Therefore, the ternary material power battery can provide twice as much space as lithium iron phosphate, which is very important for cars with limited space. Tesla produces ternary lithium batteries, and BYD produces lithium iron phosphate batteries, so it is said that "passengers choose BYD for buses, and Tesla for cars".

2. Also because of the high energy density, the weight is also much smaller, the light weight and the small footprint determine that the ternary lithium battery new energy vehicles consume less electricity, so the speed is faster and the endurance is stronger. Therefore, the use of ternary lithium batteries for cars can run farther, and lithium iron phosphate new energy vehicles are still basically used for city buses, because a battery life is not far away, and a charging pile can be charged within a short distance.

3. Of course, the core of passenger buses using lithium iron phosphate batteries is based on safety considerations. There are more than one Tesla car fire accidents, the reason is: Tesla's battery pack is composed of about 7000 18650 ternary lithium batteries. If these units or the entire battery pack are internally short-circuited, an open fire will occur and encounter extreme In the collision accident, the short circuit caused a fire. The material of lithium iron phosphate will not burn when it encounters a short circuit, and its high temperature resistance is much better than that of a ternary lithium battery.

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