What factors affect the cycle performance of lithium batteries?

Factors affecting the cycle performance of lithium batteries: 1. Excessive moisture will cause side reactions with the positive and negative active materials, destroy its structure and affect the cycle. At the same time, excessive moisture is not conducive to the formation of SEI film, but in trace amounts While the water is difficult to remove, trace amounts of water can also guarantee the performance of the battery to a certain extent. 2. Positive and negative electrode compaction The positive and negative electrode compaction is too high, although it can increase the energy density of the cell, but it will also reduce the cycle performance of the material to a certain extent. From the theoretical analysis, the greater the compaction, the equivalent to the material The greater the damage of the structure, and the structure of the material is the basis to ensure that the lithium battery can be recycled; in addition, it is difficult to ensure a higher liquid retention capacity for batteries with higher positive and negative electrode compaction, and the liquid retention capacity is that the batteries are completed normally The basis for loops or more loops. 3. Objective conditions of the test Charge and discharge rate, cut-off voltage, charge cut-off current during the test, overcharge and overdischarge during the test, temperature of the test room, sudden interruption during the test, contact resistance between the test point and the battery cell, etc. External factors will more or less affect the cycle performance test results. In addition, different materials have different sensitivity to the above objective factors. A unified test standard and knowledge of common and important material characteristics should be enough for daily work. 4. Electrolyte amount Insufficient amount of electrolyte has an important impact on the cycle. There are three reasons: one is insufficient injection amount, second, although the injection amount is sufficient, the aging time is not enough, or the positive and negative electrodes are insufficiently immersed due to high compaction. , The third is that the electrolyte inside the battery cell is consumed with the circulation. The third point is that the microscopic performance of the matching between the positive and negative electrodes, especially the negative electrode, and the electrolyte is the formation of dense and stable SEI, while the performance visible to the right eye is the consumption rate of the electrolyte during the cycle, and the incomplete SEI On the one hand, the membrane cannot effectively prevent side reactions between the negative electrode and the electrolyte to consume the electrolyte. On the other hand, the defective part of the SEI membrane will regenerate the SEI membrane as the cycle progresses, thereby consuming the reversible lithium source and the electrolyte. Regardless of whether it’s a battery that circulates hundreds or even thousands of times or a power statement about dozens of dives: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous one: how to How to use and maintain lithium-ion power lithium-ion batteries?