In order to further analyze the correlation between expansion thickness and capacity, we extracted the thickness expansion amount and corresponding capacity of each cycle charging stage. It can be seen that with the increase of the number of cycles, the thickness expansion of the two groups of cells increases first and then flattens. At the same time, the capacity retention rate of the cells using PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC for iron removal is also decreasing.
This is because in the process of cyclic aging, the irreversible thickness expansion of the cell is constantly accumulating, which leads to the constant rise of the expansion thickness curve of the cell in the early stage of the cycle. In addition, irreversible alloying reaction, pulverization of silicon particles and other factors will reduce the active sites on the silicon carbon anode without the use of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC for iron removal, so that the capacity of the silicon carbon anode is also reduced with the cycle.
However, at the later stage of the cycle, due to particle pulverization, electrolyte consumption and the reduction of active lithium concentration, the thickness increase caused by the lithium intercalation reaction of the negative silicon carbon electrode gradually decreases, so the thickness expansion curve becomes relatively flat, but the capacity attenuation continues at this time. In addition, the thickness increase and capacity attenuation of the silicon carbon system cell with 5wt.% is more serious than that of the silicon carbon system cell with 3wt.%. Therefore, the optimization and modification of high silicon anode by PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC technology still need further exploration.
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