Now you know the factors affecting the cycle performance of lithium electronic batteries! Let's take a look at the factors affecting the cycle performance of lithium-ion batteries! The cycle performance of lithium-ion batteries need not be said; in terms of macroscopic, longer cycle life means less resource consumption. Therefore, the factors affecting the cycle performance of lithium-ion batteries are every person related to the lithium industry has to consider the issue.

　　One 、Anode and cathode compaction

　　Although high positive and negative compaction can improve the energy density of the cell, it will also reduce the cycle performance of the material to a certain extent; from the theoretical analysis, the greater the compaction, equivalent to the greater the structural damage to the material, and the structure of the material is to ensure that the lithium-ion battery can be recycled; in addition, the positive and negative compaction of higher cells is difficult to ensure a higher amount of liquid retention, and the amount of liquid retention is the basis for the completion of the normal cycle or more More cycles of the basis.

　　Two 、Moisture

　　Excessive water will react with the positive and negative electrode active materials and destroy their structure, thus affecting the cycle.

　　Three 、Coating film density

　　It is almost an impossible task to consider the effect of film density on the cycle in a single variable. The inconsistency of film density either brings the difference in capacity or the difference of the number of layers of core winding or stacking. Considering that a thinner film density can increase the multiplier performance of the cell, and the baking and water removal of the electrode and bare cell will be easier, of course, the error in the coating of a too-thin film density may be more difficult to control, and the large particles in the active material may also have a negative impact on the coating and rolling, more layers mean more foil and diaphragm, which in turn means higher cost and lower energy density, so a balanced consideration is needed when evaluating.

　　Four 、Objective conditions of the test

　　The charge/discharge rate, cut-off voltage, charge cut-off current, overcharge and over-discharge during the test, test room temperature, sudden interruptions during the test, contact resistance between the test point and the core, and other external factors will affect the cycle performance test results to a greater or lesser extent. It should be enough for daily work.

　　Five 、Overdose of the negative electrode

　　In addition to the impact of the first irreversible capacity and the deviation of the coating film density, the impact on the cycling performance is also a consideration. For the lithium cobalt plus graphite system, it is common that the negative graphite becomes the "shortboard" in the cycling process. But after several hundred cycles, the structure of the positive electrode has changed little, but the structure of the negative electrode has been severely damaged and cannot fully receive the lithium ions provided by the positive electrode.

　　Six 、Electrolyte quantity

　　There are three main reasons for insufficient electrolyte quantity to affect the cycle; one is an insufficient liquid injection, the second is that although the liquid injection is sufficient, the aging time is not enough, or the positive and negative electrodes are not sufficiently dipped due to high compaction, the third is that the electrolyte inside the core is consumed with the cycle. The third point is that the microscopic manifestation of the matching between positive and negative electrodes, especially negative electrodes and electrolytes, is the formation of dense and stable SEI, while the visible manifestation of the right eye is the consumption rate of electrolyte during the cycling process. Film and thus consume the reversible lithium source and electrolyte. Whether it is for hundreds or even thousands of cycles or for dozens of diving cells, if the electrolyte is sufficient before the cycle and the electrolyte has been consumed after the cycle, it is likely that increasing the electrolyte retention can improve the cycle performance to some extent.

　　Seven 、Material type

　　The choice of materials is the first element that affects the performance of lithium-ion batteries. If you choose materials with poor cycle performance, the process will be reasonable and perfect, and the cycle of the cell will not be guaranteed; if you choose better materials, even if there are some problems with the subsequent manufacture, the cycle performance may not be too bad, from the material point of view, the cycle performance of a full battery is made up of the cycle performance of the positive electrode matched with the electrolyte, the cycle performance of the negative electrode matched with the electrolyte, and the cycle performance of the negative electrode matched with the electrolyte. From the material point of view, the cycle performance of a full battery is determined by the cycle performance of the cathode after matching with the electrolyte and the cycle performance of the cathode after matching with the electrolyte, the worse of the two. This may lead to premature consumption of the electrolyte due to the inability of the active material and the corresponding electrolyte to produce a dense and uniform SEI film. In the design of the battery cell, if one pole is confirmed to be made of a material with poor cycle performance, the other pole does not need to be made of a material with better cycle performance, which is wasteful.

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