Lithium iron phosphate battery &; What are the advantages and disadvantages of mdash? Introduction to & ampmdash
Lithium iron phosphate battery refers to a lithium ion battery with lithium ferrous phosphate as cathode material. The cathode materials of lithium ion batteries generally include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium ferrous phosphate and so on. Among them, lithium cobalt oxide is the cathode material used in most lithium ion batteries. The performance of lithium-ion battery depends on the anode and cathode materials. As a lithium battery material, lithium ferrous phosphate only appeared in recent years. In July 2005, China developed a large-capacity lithium iron phosphate battery. Its safety factor and cycle life are unmatched by other materials, and these are the most important technical indicators of power batteries. 1C charge-discharge cycle life reaches 2000 times. The single battery will not burn when overcharged at 30V, and will not explode when punctured. Large-capacity lithium-ion batteries made of lithium ferrous phosphate cathode materials are easier to be used in series. So as to meet the requirements of frequent charging and discharging of electric vehicles. It has the advantages of non-toxicity, no pollution, good safety factor, wide source of raw materials, low price and long service life. It is an ideal cathode material for a new generation of lithium ion batteries.
Brief introduction of advantages and disadvantages of lithium iron phosphate battery
1. In the sintering process of preparing lithium ferrous phosphate, iron oxide can be reduced to elemental iron in high temperature reducing atmosphere. Pure iron will lead to micro-short circuit of the battery, which is the most taboo substance in the battery. This is also the key reason why Japan has not used this material as a negative electrode material for power lithium-ion batteries.
2. Lithium ferrous phosphate has performance defects such as low tap density and low compaction density, which affects the low energy density of lithium ion batteries. Poor low temperature performance, even nano-scale and carbon coating, has not solved this problem. Dr. Don Leibbrand, director of the Energy Storage System Center of Argonne National Laboratory, described the low-temperature performance of lithium iron phosphate battery as terrible. Their test results of lithium-ion batteries in Ferrous lithium phosphate showed that lithium iron phosphate batteries could not drive electric vehicles at low temperature (below 0℃). Although some manufacturers claim that lithium iron phosphate battery has good capacity maintenance rate at low temperature, under the conditions of low discharge current and low discharge cut-off voltage. In this case, the equipment can't start working at all.
3. The manufacturing cost of materials is higher than that of batteries, resulting in low yield and poor consistency of batteries. Although nano-LiFePO4 and carbon coating improve the electrochemical properties of the materials, they also bring some problems, such as low energy density, high synthesis cost, poor electrode production and processing performance, harsh environmental requirements and so on. Although the chemical elements in Ferrous lithium phosphate are rich in lithium, iron and phosphorus, and the cost is low, the cost of the prepared Ferrous lithium phosphate product is not low. Even if the previous research and development costs are removed, the process cost of this material plus the higher cost of preparing batteries will make the final unit energy storage cost higher.
4. Poor product consistency. At present, there is no lithium ferrous phosphate material factory in China that can solve this problem. From the point of view of material preparation, the synthesis of lithium ferrous phosphate is a complex multiphase reaction, including solid phosphate, iron oxide and lithium salt, carbon precursor and reducing gas phase. In this complicated reaction process, it is difficult to ensure the consistency of the reaction.
5. Questions about intellectual property rights. At present, the basic patent of lithium ferrous phosphate belongs to the University of Texas, while the carbon-coated patent is applied by Canadians. These two basic patents cannot be bypassed. If royalties are included in the cost, the product cost will further increase.
After reading it, do you know the advantages and disadvantages of lithium batteries in lithium ferrous phosphate? I think it is not difficult for friends to understand. Finally, I hope that the introduction of automobile system can solve the problem for friends.
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