Material type: the choice of material is the first factor that affects the performance of lithium ion battery. The selection of materials with poor cycle performance, and the process is reasonable and perfect, and the cycle of the cell is inevitably unable to be guaranteed; Choose a better material, even if there are some problems in the subsequent production, the cycling performance may not be too bad.

From the point of view of materials, the cycle performance of a full battery is determined by the cycling performance of the positive electrode and the electrolyte, and the cycling performance of the negative electrode and the electrolyte after the matching. Material cycle performance is poorer, on the one hand, is likely to be in circulation in the process of crystal structure change too fast to continue to complete the intercalated-li lithium, on the one hand may be due to the active substance and its corresponding electrolyte can't generate dense and uniform SEI film active material and electrolyte premature side reaction and make the electrolyte excessive consumption will affect cycle. In the design of the cell, if one pole confirms the selection of materials with poor cycle performance, the other pole does not need to choose materials with good cycle performance, waste.