Analysis of Electrical Properties and Physicochemical Properties of Electrode Materials for Lithium Iron Phosphate Batteries Used in Electrochemical Energy Storage Power Stations
In order to optimize the operation and maintenance strategy of battery charging and discharging in energy storage power stations,the charging and discharging performance of lithium iron phosphate battery used in energy storage power station are tested under constant power P,2P and 4P.After disassembly,the electrode materials are tested by scanning electron microscopy,X-ray diffraction and inductively coupled plasma spectrum.The results show that with the increase of charging and discharging power,the cycle time of charging and discharging becomes shorter,the internal resistance becomes larger,and the effective charging and discharging capacity of the battery becomes smaller.At 4P power,there are obvious cracks in the lithium iron phosphate particles in the positive electrode of the battery,and the mass fraction of Fe,P,S and other elements on the surface of the negative electrode is relatively high.After a certain number of cycles of charging and discharging,the battery begins to age and FePO4 phase appears.High power charging and discharging can increase the mass fraction of lithium in the negative electrode material,while the mass fraction of lithium in the positive electrode is inversely proportional to power,which accelerates the aging of the battery.In the actual operation and maintenance of an energy storage power station,low-power charging and discharging strategies should be adopted for the battery,which can effectively improve the service life and safety reliability of the battery.
energy storage power stationlithium iron phosphate batteryelectrode materialbattery capacitance
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