A brief history of the development of lithium iron phosphate batteries. Compared with ternary lithium batteries, lithium iron phosphate batteries were used in new energy vehicles earlier. However, due to the low energy density of the battery, lithium iron phosphate batteries were replaced by ternary lithium batteries. Lithium batteries have almost completely replaced them. Nine out of ten new energy vehicles are equipped with ternary lithium batteries, and the installed volume far exceeds that of lithium iron phosphate batteries. This has ushered in the spring for ternary lithium companies such as LG and CATL. At the beginning of 2021, BYD, which has been focusing on the research and development of lithium iron phosphate batteries, made a major breakthrough, which greatly improved the energy density of lithium iron phosphate batteries. In addition, there are more and more cases of spontaneous combustion of ternary lithium batteries, and everyone is paying more attention to the safety of the batteries. , lithium iron phosphate batteries have once again entered people's field of vision. BYD's Fudi Battery, AVIC Lithium Battery, Guoxuan Hi-Tech, and Yiwei Lithium Energy are shining brightly. LG and CATL have also joined the camp of lithium iron phosphate batteries.
Advantages and Disadvantages of Lithium Iron Phosphate Batteries The reason why new energy vehicles were initially equipped with lithium iron phosphate batteries is because the cost of this type of battery is not high, its service life is long and its safety is good. Now Lithium iron phosphate batteries also maintain these advantages. Today's new energy subsidies have declined significantly compared to a few years ago. The production costs of new energy vehicles have been passed on to consumers more, and many people cannot afford such high costs. Therefore, current car companies are more inclined to replace lithium iron phosphate batteries to reduce the price. For example, Tesla's standard range version, the guide price of the 2020 model using ternary lithium batteries reaches more than 290,000, and the 2021 model replaces it with lithium iron phosphate batteries. The guide price of lithium iron phosphate batteries is only over 250,000. The biggest disadvantage of lithium iron phosphate batteries seems to be low energy density, but now that technology has made breakthroughs, there seems to be no shortcomings... There are still disadvantages. The lithium ions in the cathode material of lithium iron phosphate batteries are in the electrolyte The free amount in the battery will be affected by low temperature. Simply put, if the temperature is too low, the capacity of the lithium iron phosphate battery will decrease. The capacity at 0°C is only about 65% of the normal capacity, and the capacity at -10°C is only about 65% of the normal capacity. Below 50 or so, the impact is quite large.
Does lithium iron phosphate battery spontaneously ignite? Battery spontaneous combustion is actually a very complex problem. In addition to the reaction of some chemical substances inside the battery itself that can cause spontaneous combustion, battery leakage or some other conditions may also cause spontaneous combustion. BYD's blade battery, for example, was able to neither smoke, explode nor generate heat or catch fire in a pinprick test, but it still spontaneously ignited after a crash test by a certain media. Not to mention electric vehicles, fuel vehicles also occasionally spontaneously ignite, so this thing cannot be avoided. After all, there are bound to be risks with this thing. All car companies can do is try to reduce the risk of spontaneous combustion of the battery and ensure that it will not suddenly catch fire while driving normally on the road. Judging from the trend, the low cost advantage of lithium iron phosphate batteries has formed a six-for-four situation with ternary lithium. However, some companies are already working on solving the problem of spontaneous combustion of ternary lithium batteries. We will introduce it in the next article. , if you are interested, you might as well click to take a look. Advantages and disadvantages of ternary lithium batteries, why it is not recommended to fully charge ternary lithium batteries