Several factors affecting the cycle function of lithium batteries

The choice of materials is the top element that affects the function of lithium batteries. When designing the battery cell, if one pole admits to use materials with poor circulation functions, the other pole does not need to choose materials with better circulation functions, which is wasted. 2. Negative compaction: If the compaction of the positive and negative poles is too high, although it can increase the energy density of the cell, it will also reduce the circulation function of the material to a certain extent. 3. Moisture: Excessive moisture will cause side reactions with the positive and negative active materials, destroy its structure and affect circulation. At the same time, too much moisture is not conducive to the formation of SEI film. 4. Film density: It is almost an impossible task to consider the influence of film density on the cycle of a single variable. Inconsistent film density will either bring about a difference in capacity, or a difference in the number of core windings or laminated layers. For batteries of the same type, capacity and material, decreasing the film density is equivalent to adding one or more layers of winding or lamination, and the corresponding added barrier can absorb more electrolyte to ensure circulation. 5. Extremely excessive: The reason for the excessive negative electrode is not only the influence of the first irreversible capacity and the density error of the coating film, but also the influence on the circulation function. 6. Solution volume: There are three reasons for the lack of electrolyte volume to affect the circulation. One is the lack of injection volume, and the other is that although the injection volume is sufficient, the aging time is not enough or the positive and negative electrodes are leached due to the high level of compaction Insufficient liquid, the third is to end up with the consumption of the electrolyte inside the circulating cell. 7. The objective conditions of the test: charge-discharge rate, cut-off voltage, charge cut-off current during the test, overcharge and over-discharge during the test, temperature in the test room, sudden suspension during the test, contact resistance between the test point and the cell Such external factors will more or less affect the results of the circulatory function test. In addition, different materials have different sensitivity to the above objective elements. Consistent testing standards and knowing the characteristics of common and important materials should be enough for daily work. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the treatment methods for lithium battery UPS power supply in the factory