-(6)What is a lithium iron phosphate battery? A simple understanding of lithium iron phosphate batteries

(6)What is a lithium iron phosphate battery? A simple understanding of lithium iron phosphate batteries
author:enerbyte source:本站 click382 Release date: 2023-09-05 14:12:15
abstract:
three The preparation cost of materials is relatively high compared to the manufacturing cost of batteries, resulting in low battery yield and poor consistency. Although the nanomaterialization and carbon coating of lithium iron phosphate have improved the electrochemical pe...

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The preparation cost of materials is relatively high compared to the manufacturing cost of batteries, resulting in low battery yield and poor consistency. Although the nanomaterialization and carbon coating of lithium iron phosphate have improved the electrochemical performance of the material, they have also brought other problems, such as reduced energy density, increased synthesis costs, poor electrode processing performance, and strict environmental requirements. Although the chemical elements Li, Fe, and P in lithium iron phosphate are abundant and the cost is relatively low, the cost of preparing lithium iron phosphate products is not low. Even if the initial research and development costs are removed, the process cost of the material, combined with the higher cost of preparing batteries, will result in a higher cost per unit of energy storage.

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Poor product consistency. At present, there is no domestic lithium iron phosphate material factory that can solve this problem. From the perspective of material preparation, the synthesis reaction of lithium iron phosphate is a complex multiphase reaction, consisting of solid phosphate, iron oxide, and lithium salt, carbon precursor, and reducing gas phase. It is difficult to ensure the consistency of the reaction in this complex reaction process.

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Intellectual property issues. The earliest patent application for lithium iron phosphate was obtained by FXMITTERMAIER&SOEHNEOHG (DE) on June 25, 1993, and the application results were announced on August 19 of the same year. The basic patent for lithium iron phosphate is owned by the University of Texas in the United States, while the carbon coating patent is applied for by Canadians. These two fundamental patents cannot be bypassed, and if patent usage fees are included in the cost, the product cost will further increase.

In addition, based on the relevant experience in research and development and production of lithium-ion batteries, Japan was the earliest country to commercialize lithium-ion batteries and has always occupied the high-end lithium-ion battery market. Although the United States is leading in some basic research, there is currently no large lithium-ion battery production company in the country. Therefore, Japan's choice of modified lithium manganese oxide as the positive electrode material for power lithium-ion batteries is more reasonable. Even in the United States, half of the manufacturers use lithium iron phosphate and lithium manganese oxide as positive electrode materials for power lithium-ion batteries, and the federal government also supports the research and development of both systems. Given the aforementioned issues with lithium iron phosphate, it is difficult to obtain widespread application as a positive electrode material for power type lithium-ion batteries in fields such as new energy vehicles. If the problem of poor high-temperature cycling and storage performance of lithium manganese oxide can be solved, with its advantages of low cost and high rate performance, its application in power lithium-ion batteries will have enormous potential.

In the metal trading market, cobalt (Co) is the most expensive and has limited storage capacity. Nickel (Ni) and manganese (Mn) are cheaper, while iron (Fe) is the cheapest. The price of positive electrode materials is also consistent with the price trend of these metals. Therefore, lithium-ion batteries made of LiFePO4 cathode material should be the cheapest. Another characteristic of it is that it has no pollution to the environment.

As a rechargeable battery, the requirements are: high capacity, high output voltage, good charging and discharging cycle performance, stable output voltage, high current charging and discharging capacity, electrochemical stability performance, safety in use (not causing combustion or explosion due to improper operation such as overcharging, overcharging, and short circuit), wide working temperature range, non-toxic or less toxic, and no pollution to the environment. The lithium iron phosphate ion battery using LiFePO4 as the positive electrode has good performance requirements, especially in high discharge rate discharge (5-10C discharge), stable discharge voltage, safety (non combustion, no explosion), lifespan (number of cycles), and no pollution to the environment. It is currently the best high current output power lithium battery.

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