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Type of raw materials used: The selection of materials is the first factor affecting the performance of lithium-ion batteries. The quality of the material performance determines the cycling performance of the battery. If the material performance is poor, no matter how reasonable the process is, the cycling of the battery cell cannot be guaranteed; From a material perspective, the cycling performance of a battery is determined by the worse of the matching between the positive electrode and electrolyte, or the matching between the negative electrode and electrolyte. The cycling performance of the material is poor. On the one hand, the crystal structure changes too quickly during the cycling process, making it impossible to continue lithium insertion and lithium removal. On the other hand, it may be due to the inability of the active substance to generate a dense and uniform SEI film with the corresponding electrolyte, causing side reactions between the active substance and the electrolyte too early, resulting in the electrolyte being consumed too quickly and affecting the cycling. When designing the battery cell, if one pole is confirmed to use materials with poor cycling performance, the other pole does not need to choose materials with good cycling performance, which is wasteful.

Positive and negative electrode compaction: If the positive and negative electrode compaction is too high, although it can increase the energy density of the battery cell, it will also to some extent reduce the cycling performance of the material. If the compaction of the positive and negative electrodes is too large, it is not conducive to the insertion and removal of lithium ions, which may reduce the capacity of the battery and also reduce the cycling and rate performance of the battery.

Moisture: Excessive moisture can cause side reactions with positive and negative electrode active substances and electrolytes, disrupt their structure, and affect circulation, causing side reactions to react on the electrode surface, affecting the insertion and removal of lithium ions. Excessive moisture also hinders the formation of SEI films. If there is too much water, it will electrolyze inside the battery and produce gas, causing excessive air pressure inside the battery and causing battery leakage. In severe cases, it can cause the battery explosion-proof valve to open. But while trace amounts of water are difficult to remove, trace amounts of water can also ensure the performance of the cell to a certain extent.

Coating surface density: For cells of the same model, capacity, and material, reducing the membrane density is equivalent to adding one or more layers of winding or lamination. The corresponding newly added diaphragm can absorb more electrolyte to ensure circulation. Considering that a thinner film density can increase the rate performance of the cell, and the drying and water removal of the electrode and bare cell will also be easier. However, when the surface density is lower, it is difficult for the operator to control the surface density during the drawing process, further affecting product quality. Moreover, large particles in the slurry may also cause more difficulties for coating and rolling, while reducing production efficiency and the difficulty of adding new employees., Therefore, the improvement of coating surface density should comprehensively consider the above factors.

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