Effect of physicochemical parameters of lithium iron phosphate battery raw materials on electrical properties
Lithium iron phosphate batteries are widely used in various fields because of their advantages of wide source of raw materials, good rate performance and excellent safety performance, and its friendly electrical properties come from the close monitoring of the physical and chemical parameters of various raw materials:
【 Cathode - lithium iron phosphate 】
Lithium iron phosphate (LiFePO4) is an olivine-type structure and is used as a cathode material in lithium batteries. The theoretical capacity is 170mAh/g, and the actual capacity is 130-145mAh/g. It has the advantages of low price, good electrochemical performance, environmental friendliness and no pollution.
【 Negative electrode - artificial graphite 】
Artificial graphite is a commonly used anode material for lithium-ion batteries, and its crystals are stacked with hexagonal mesh plane specifications composed of carbon atoms, with a layered structure.
Graphite has good conductivity and high crystallinity, and lithium ions are embedded in the graphite layer thickly, forming litechnic lixC6. When charging and discharging, the deintercalation reaction of lithium in graphite:
C6 + xLi++xe-=LixC6
【 Electrolyte 】
The electrolyte is an important component of the battery, which plays the role of conducting ions between the positive and negative electrodes of the battery, and is the bridge connecting the positive and negative electrode materials.
(To be continued)
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Article source: New Energy Era
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