Comparative analysis of the advantages and disadvantages of lithium iron phosphate batteries and ternary lithium ion batteries

There are two important new energy vehicle battery technologies currently in use, lithium iron phosphate batteries and ternary lithium ion batteries. Although these two batteries can be replaced in many places, most of them are still new energy vehicles. The country’s largest lithium-ion battery application range, so it is necessary to make a comparison. Compared with the price of the car, the battery performance can be compared functionally. Which one is better for the ternary lithium-ion battery and the iron phosphate lithium-ion battery? Set the conditions and conclude that the actual data of the two batteries are clear. According to related laboratories, the experimental results of new energy vehicle manufacturers and power lithium battery manufacturers show that although there are inevitably subtle differences in detailed parameters for each test, the difference in the pros and cons of the two battery functions tends to be different. Yu unanimous. To this end, we replace the table parameters for comparison. The difference between ternary lithium ion battery VS lithium iron phosphate battery and ternary lithium ion battery 1. BYD is a passenger car, and Tesla is a passenger car. This is the difference in volume. According to current technology, the energy density of ternary lithium-ion batteries is generally 200Wh/kg, and may reach 300Wh/kg in the future. At present, lithium iron phosphate batteries are basically hovering at 100~110Wh/kg, and some can reach 130~150Wh/kg, but it is difficult to exceed 200Wh/kg. 2. Moreover, due to the high energy density, the weight is much smaller. Light weight and small footprint determine the low power consumption, high speed and strong endurance of new energy vehicles with ternary lithium-ion batteries. Therefore, cars using ternary lithium-ion batteries can go farther, while lithium iron phosphate new energy vehicles are basically still used on urban buses, because the time range is not far, and short-distance charging is required in the charging pile. 3. Of course, for safety reasons, it is more necessary to use lithium iron phosphate batteries on passenger buses. More than one fire accident has occurred in Tesla Motors. The reason is that Tesla’s battery pack is composed of approximately 7,000 18650 ternary lithium-ion batteries. If the batteries of these units or the entire battery pack are internally short-circuited, it will cause an open flame. Moreover, the lithium iron phosphate material will not burn in case of a short circuit, and its high temperature resistance performance is far better than that of a ternary lithium ion battery. 4. Lithium iron phosphate batteries are resistant to high temperatures, but ternary lithium-ion batteries have good low-temperature resistance. It is an important technical route. The production of lithium-ion batteries at a low temperature of -20C, ternary lithium-ion batteries can release 70.14% of the output. , And the lithium iron phosphate battery can only release 54.94% of the capacity, and due to low temperature conditions, the ternary lithium ion battery discharge platform starts much faster than the voltage platform of the lithium iron phosphate battery. 5. The charging efficiency is high, and the ternary lithium ion battery is higher. Lithium-ion battery charging uses a current-limiting voltage method, that is, constant current charging is performed in the first stage. At this time, the current is large and the efficiency is high. After the constant current charging reaches a certain voltage, it enters the second stage of constant voltage charging. At this time, the current is small and the efficiency is low. Therefore, in order to measure the charging efficiency of the two, the ratio of the constant current charging capacity to the total battery capacity is used, which is called the constant current ratio. Experimental data shows that when charging under 10C conditions, the difference between the two is not much, but there will be a difference of more than 10C. When charging at 20C, the constant current ratio of the ternary lithium-ion battery is 52.75%, and the constant current ratio of the lithium iron phosphate battery is 10.08%, the former is 5 times that of the latter. 6. In terms of cycle life, lithium iron phosphate batteries are superior to ternary lithium ion batteries. The theoretical life of ternary lithium-ion batteries is 2000 times that of ordinary lithium-ion batteries. Even the best brand in the industry, Tesla, can only maintain 70% of the power after 3000 times, while the lithium iron phosphate battery can still maintain 80% of the power after the same cycle. The comparison of the above six aspects can roughly conclude that the comparative advantages of the two can help answer the question of which is better, ternary lithium ion battery or lithium iron phosphate battery: lithium iron phosphate battery is safe and has a long life. , High temperature resistance; Ternary lithium-ion battery has light weight, high charging efficiency and low temperature resistance. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the important disadvantages of lithium iron phosphate batteries?