[abstract]:the capacity attenuation mechanism of 18650 commercial lithium ion battery at room temperature was studied. The results show that the capacity decay rate of 18650 cylindrical cellsis 12.91% after 500 cycles. XRD, SEM, EIS and CV were used to characterize the cells after circulation. The electro chemical impedance diagrams show that the resistance of the battery, especially the charge transfer resistance, increases with the cycle. At the same time, cyclic voltammetry test shows that the reversible performance of lithium ion removal decreases in the later stage of the cycle, leading to capacity attenuation. This is because electrolyte and electrode material side reactions occur at the interface between positive and negative electrode materials, repeatedly forming solid electrolyte interface film. At the same time, some of the side reaction products are deposited on the membrane, blocking the membrane hole, preventing the flow of lithium ions. Therefore, the movement resistance of lithium ions between positive and negative electrodes increases, leading to the capacity attenuation and potential attenuation of the battery.

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