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Spatial structure and reaction principle of lithium iron phosphate battery

by:dcfpower     2021-03-28
For LiFePO4 cathode materials, the source of raw materials is relatively wide, the cycle life is long, the safety index is also high, and the environmental pollution is small. It has very strong comprehensive performance in many cathode materials, and it has always been the preparation of lithium ion battery cathodes. Hot spot materials. With the development in recent years, LiFePO4 cathode materials have reached a practical level, and have even begun to be used in formal commercial applications. LiFePO4 has an olivine structure. The spatial structure is shown in Figure 1. Its theoretical specific capacity is 170mAhh. When a lithium ion battery is charged, an oxidation reaction occurs. The lithium ion FeO6 is released between the layers, flows into the electrolyte, and finally reaches the negative electrode. In the external circuit, the electrons reach the negative electrode at the same time, and iron will change from divalent iron ions to trivalent iron ions. , An oxidation reaction occurs. The discharging process is opposite to the charging process, and a reduction reaction occurs. u003cpu003eFigure 1 Spatial structure of LiFePO4u003c/pu003eu003c/pu003e
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