Five major defects that cannot be ignored in lithium iron phosphate batteries

Lithium iron phosphate batteries also have their shortcomings: for example, poor low-temperature performance, low vibration density of the positive electrode material, and the same capacity of lithium iron phosphate batteries are larger than lithium cobalt oxide and other lithium batteries, so there is no advantage in micro batteries. When used in power lithium-ion batteries, lithium iron phosphate batteries are the same as other batteries and have to face the same battery problems. Defects Whether a material has development potential, in addition to paying attention to its advantages, it is more important that the material has fundamental defects. At present, lithium iron phosphate is widely used as the cathode material of power lithium batteries in China. Market analysts from the government, scientific research institutions, companies and even securities companies are optimistic about this material and regard it as the starting direction of power lithium batteries. Analyzing the reasons, there are two important points: First, affected by the Ru0026D direction of the United States, its valence and A123 first chose to be the cathode material for lithium iron phosphate batteries. Secondly, there is currently no lithium manganese oxide material that can be used for dynamic lithium batteries in my country. However, lithium iron phosphate also has basic defects that cannot be ignored, which are summarized as follows: 1. In the sintering process for preparing lithium iron phosphate, iron oxide may be reduced to elemental iron in a high-temperature recycling atmosphere. Simple iron will cause the short circuit of the battery and is the most taboo material in the battery. This is the first reason why Japan did not use this material as a positive electrode material for dynamic lithium batteries. 2. Lithium iron phosphate has functional defects such as low vibration density and compaction density, resulting in low energy density of lithium batteries. The low temperature function is poor, even the nano-carbon coating does not solve this problem. When Dr. Don Hillebrand, director of the Energy Storage System Center of Argonne National Laboratory, talked about the low-temperature function of lithium iron phosphate batteries, he used terrible words. They checked the results of lithium iron phosphate batteries and found that lithium iron phosphate batteries cannot drive electric vehicles at low temperatures (below 0°C). Although some manufacturers claim that lithium-iron phosphate batteries can still maintain their capacity well at low temperatures, the discharge current at this time is low, and the discharge cut-off voltage is also low. In this case, the device cannot start the job at all. 3. The material preparation cost is higher than the battery manufacturing cost, and the battery yield rate is low. Although the nanometerization and carbon coating of lithium iron phosphate improve the electrochemical performance of the material, it also brings about problems such as energy density reduction, cost increase, poor electrode production quality, and environmental requirements. Lithium iron phosphate is rich in chemical elements such as lithium, iron, and phosphorus, and the cost is low, but the cost of products for preparing lithium iron phosphate is not low. Even if the initial development cost is removed, the technical cost of materials and the higher cost of battery preparation, the cost of unit energy storage is still very high after all. 4. The difference in product homogeneity. At present, there is no lithium iron phosphate material factory in my country that can solve this problem. From the perspective of material preparation, the composition of lithium iron phosphate is a chaotic heterogeneous reaction, consisting of solid phosphate, iron oxide and lithium, carbon precursor and recovered gas phase. In this chaotic process, it is difficult to guarantee the uniformity of the reaction. 5. The issue of intellectual property rights. At present, the basic patent of lithium iron phosphate is held by the University of Texas, and the carbon coating patent is applied by Canadians. These two basic patents cannot be bypassed. If the cost of using the patent is included, the cost of the product will be further increased. In addition, from the relevant experience in the development and processing of lithium batteries, Japan is the first country to commercialize lithium batteries and has always occupied the high-end lithium battery market. Although the United States has conducted various pre-emptive researches, it has not yet been able to process an important lithium battery. Therefore, it is more reasonable for Japan to choose modified lithium manganate as the negative electrode material for power lithium batteries. Even in the United States, the manufacture of lithium iron phosphate and lithium manganate as the negative electrode material of the lithium battery statement: Some pictures and content of the articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous article: Portable UPS power system protection needs attention what?