About the decomposition of lithium iron phosphate batteries and ternary lithium batteries

Lithium iron phosphate battery: refers to a lithium battery that uses lithium iron phosphate as the positive electrode material. Its characteristics are that it does not contain precious elements such as cobalt, the price of raw materials is low, and the content of phosphorus and iron are abundant in the earth, so there will be no supply problems. Its working voltage is moderate (3.2V), large capacity per unit weight (170mAh/g), high discharge power, fast charging and long cycle life, and high stability in high temperature and high heat environment. Advantages Compared with the more common lithium cobalt oxide and lithium manganese oxide batteries currently on the market, lithium iron phosphate batteries have at least the following five advantages: higher safety, longer service life, and no heavy metals and rare metals ( The cost of raw materials is low), fast charging is supported, and the operating temperature range is wide. Disadvantages Lithium iron phosphate has some performance defects, such as low tap density and compaction density, resulting in low energy density of lithium batteries; material preparation costs and battery manufacturing costs are high, battery yield is low, and consistency is poor ; Poor product consistency; intellectual property issues. Ternary polymer lithium battery: A lithium battery using lithium nickel cobalt manganese oxide (Li (NiCoMn) O2) ternary cathode material as the cathode material. According to Ouyang Minggao of Tsinghua University, the ternary material mentioned in this survey refers to the ternary power lithium-ion battery in the common saying that the positive electrode is ternary and the negative electrode is graphite. In actual Ru0026D applications, there is another type of positive electrode that is ternary and the negative electrode is lithium titanate. It is usually called lithium titanate. Its performance is relatively safe and its life is relatively long. Advantages The ternary lithium battery has high energy density and better cycle performance than normal lithium cobalt oxide. At present, with the continuous improvement of the formula and the perfect structure, the nominal voltage of the battery has reached 3.7V, and the capacity has reached or exceeded the level of lithium cobalt oxide batteries. Disadvantages Ternary material power lithium batteries include nickel-cobalt-aluminate batteries, nickel-cobalt-manganese lithium batteries, etc. Due to the unstable high-temperature structure of nickel-cobalt-aluminum, the high-temperature safety is poor, and the pH value is too high, which will easily cause the monomer to swell. This leads to danger, and the current cost is relatively high. In comparison, the ternary polymer lithium battery does have better characteristics than the lithium iron phosphate battery, but why its development has been hindered? The key to the development of new energy vehicles is also the development of the key battery that plagues mobile digital products. How to ensure that battery technology can meet the growing needs of consumers under safe conditions is not only the pursuit of automotive technology-related industry personnel, but also scientific research workers in the entire range. When it comes to buying new energy vehicles, most consumers probably think of preferential policies for the first time. Although this is a bit embarrassing, it is indeed a very real reason. In the domestic sales environment, the need for new energy vehicles to open up is not only because of the long-term mission of environmental protection. The advantages of new energy vehicles in terms of selling price and maintenance costs have indeed attracted the love of most consumers who are still focusing on vehicle cost at this stage. Ternary polymer lithium batteries, however, some consumers may temporarily stop their curiosity about new energy vehicles for some reasons. This is because there will be lingering fears about the spontaneous combustion of new energy vehicles. And this is exactly why the author writes this article today. It is necessary to know that if you don't know the basics of new energy vehicles-the pros and cons of energy modules, and don't know what to pay attention to during use, it is actually no different from buying a timely bomb and putting it around. Lithium iron phosphate battery: mature but not enough. Lithium iron phosphate electrode material is currently the safest cathode material for lithium batteries. In addition, its cycle life reaches more than 2000 times. Standard charging (5 hours rate) can reach 2000 cycles. Sexual characteristics, coupled with the technological threshold and decline in technology brought about by the maturity of the industry, make many manufacturers adopt lithium iron phosphate batteries for various reasons. It can be said that the rise of new energy vehicles has an inseparable relationship with lithium iron phosphate batteries. However, lithium iron phosphate batteries have a fatal shortcoming, that is, poor low-temperature performance, even if they are nano-sized and carbon coated, this problem is not solved. The study stated that if a battery with a capacity of 3500mAh is operated at -10°C, after less than 100 charge-discharge cycles, the power will decay sharply to 500mAh, which is basically scrapped. This is indeed not a good thing in terms of our country's vast territory and the fact that there are more low temperatures in winter. In addition, the cost of material preparation and the cost of battery manufacturing are relatively high, the battery yield is low, and the consistency is poor, which is also an important reason why many pure electric vehicles cannot reach the nominal value. Therefore, we can see that many domestic new energy vehicles (whether pure electric or hybrid electric), or some relatively cheap new energy vehicles, will choose lithium iron phosphate batteries for different reasons. It can be said that the use of lithium iron phosphate batteries has an indelible foundation for the mass production and promotion of new energy vehicles. 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: Introduction to lithium battery customization skills