In addition to the comparative analysis of the total expansion thickness changes of the two silicon carbon system cells, we also carried out a detailed analysis of the irreversible expansion amount of each circle in the cycle process, the specific operation is as follows: the change of the charging expansion thickness of a circle minus the change of the volume shrinkage during discharge, the difference is the irreversible expansion thickness of the circle. PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC removal process
Since the negative electrode of the PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC after iron removal will undergo the process of alloying lithium insertion during charging, if the reaction is completely reversible during discharge, the irreversible expansion thickness should be close to zero. Therefore, this parameter can reflect the lithium removal ability of silicon carbon anode under different aging conditions. The irreversible expansion thickness of two groups of silicon carbon cells with different proportions as a function of the number of cycles
It is obvious that the irreversible expansion thickness of the two groups of cells increases with the increase of the number of cycles, and the amount of irreversible expansion of the two groups is almost the same before 35 cycles. However, with the continuous cycle aging, the irreversible expansion of the 5wt.% silicon core becomes more serious. The results show that the silicon content of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC magnetic for removing iron greatly affects the expansion performance of the cell at the late cycle stage.
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