Prospect analysis of lithium iron phosphate battery

by:CTECHi     2021-07-26

Introduction to lithium iron phosphate batteries: High-performance batteries are vital to the development of the new energy industry. Compared with lead-acid batteries, lithium-ion batteries have the advantages of higher specific energy and long cycle life. At present, lithium-ion batteries can be divided into two categories according to the different cathode materials. One is lithium cobalt oxide, lithium nickel cobalt manganese oxide and lithium manganese oxide batteries. The voltage of this type of battery is about 4V, and the specific energy can reach 140-150Wh. /Kg, but the safety of the battery is poor, which is determined by the chemical properties of the positive electrode material itself, and is only suitable for use as a small-capacity battery; the other type is lithium iron phosphate battery, the battery voltage platform is 3.2V, and the specific energy Slightly lower than the previous type of battery, but the outstanding advantages of this battery are good safety, long cycle life, low cost, and good environmental compatibility, so it is very suitable as a power source for various new energy electric vehicles and new energy storage. Lithium iron phosphate batteries can increase the energy storage efficiency of photovoltaic systems to 95%. Most current photovoltaic systems also use lead-acid batteries as energy storage devices, but in comparison, the replacement of lithium iron phosphate batteries can give full play to its advantages, including Improve energy storage efficiency, extend service life, reduce unit cost, and so on. This type of lithium battery is used as an energy storage device, which can increase the energy efficiency to 95%, far exceeding 70-80% of the traditional lead-acid battery, and has a service life of 2000 charge and discharge. The project is sponsored by the University of Southampton, UK by REAPsystems, and is led by Yue Wu, a student of the MSc School of Sustainable Energy Technology, and his supervisor, Dr. Carlos Ponce de Leon, Professor Tom Markvart, and Dr. John Low. The project specifically studied the use of lithium batteries as energy storage devices for photovoltaic systems. Student Yue Wu said, 'Lead-acid batteries are traditionally used in most photovoltaic systems as energy storage devices. However, as energy storage devices, lithium batteries, especially the LiFePO4 batteries we use, have more favorable characteristics.' To collect, it is necessary to connect the lithium iron phosphate battery and the photovoltaic system. The photovoltaic system is installed on the university building and uses a specially designed battery management system provided by REAPsystems. Yue added, “Research shows that this kind of lithium battery has 95% energy efficiency, while the current commonly used lead-acid battery is only about 80%. The weight of lithium battery is lighter, and it can be used longer than lead-acid battery. Life. The number of charge and discharge can reach 1,600 cycles, which means they do not need to be replaced frequently. 'Although the batteries need to be further tested before being put into commercial photovoltaic power generation systems. But research has shown that LiFePO4 batteries are expected to increase the efficiency of solar power generation systems and help reduce their installation and maintenance costs. Dr. CarlosPoncedeLeon and Dr. JohnLow are planning to do further project research with a group of new students. Dr. Dennis Doerffel, the founder of REAPsystems and a former researcher at the University of Southampton, said: “For various energy sources (renewable or non-renewable), energy storage devices, such as batteries, play an important role in energy utilization, unlike traditional lead-acid batteries. In comparison, LiFePO4 batteries have higher efficiency, longer service life, lighter weight and lower cost. We are expected to see this type of battery being widely used in photovoltaic systems and other renewable energy systems.' The acid and heavy metals such as lead and chromium in the production process of acid batteries and in old batteries after use have long-term damage to the human body and natural environment. At present, the random discarding of old lead-acid batteries is common, and the recovery rate is low. Developed countries such as the European Union and Japan have already implemented strict storage battery production license systems and manufacturer recycling systems, while in China, storage battery production license systems have also been launched since last year. The advantages of iron-lithium energy storage batteries can basically be summarized as: (1) Large specific energy (up to 150WH per kilogram, which is 3 times that of lead-acid batteries and hydrogen-nickel batteries); (2) Small size (compared to hydrogen-nickel batteries). Nickel batteries are 30% smaller); (3) light weight (70% lighter than traditional batteries); (4) long cycle life (cycles more than 2000 times); (5) low self-discharge rate (only self-discharge per month) 3%); (6) No memory effect (the depth of charge and discharge does not affect the capacity and life of the battery); (7) Non-toxic and pollution-free (the battery material does not contain toxic substances).

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