Several factors affecting the cycle performance of lithium batteries
Information sources：本站 | Release date：
2020-08-18 15:21:48
| Browse volume：7043
Summary：
Cycle performance means the service life of lithium batteries, and the importance is self-evident. The following lists several factors that may affect the cycle performance of the battery, for reference only.1. Material typeThe choice of materials is …
Cycle performance means the service life of lithium batteries, and the importance is self-evident. The following lists several factors that may affect the cycle performance of the battery, for reference only.
1. Material type
The choice of materials is the first element that affects the performance of lithium batteries. Using materials with poor cycle performance, even if the process is reasonable and the production is perfect, the cycle performance of the cell cannot be guaranteed. From the material point of view, the cycle performance of a battery is determined by the poorer of the cycle performance of the positive electrode material or the negative electrode material and the electrolyte.
2. Compaction of positive and negative materials
Excessive compaction of positive and negative materials, although it can increase the energy density of the cell, it will reduce the cycle performance of the material to a certain extent. In theory, the greater the compaction, the greater the structural damage to the material, and the worse the cycle performance of the battery; in addition, the compaction will also have a certain impact on the liquid retention capacity of the battery cell, and the liquid retention capacity is the battery cell The basis of normal circulation.
3. Moisture
Excessive moisture will cause side reactions with the active materials of the positive and negative electrode materials, destroy its structure and affect the cycle. At the same time, too much moisture is not conducive to the formation of SEI film.
4. Coating film density
Inconsistent film density will either bring about a difference in capacity, or a difference in the number of core windings or laminate layers. For batteries with the same model, capacity and material, reducing the film density is equivalent to increasing the number of one or more winding or lamination layers, and the correspondingly increased diaphragm can absorb more electrolyte to ensure circulation.
5. Excessive anode material
If the negative electrode material excess ratio is too low, the positive electrode material structure may not change after the battery is cycled hundreds of times, but the negative electrode material structure is severely damaged, causing the battery cell capacity to drop prematurely.
6. The amount of electrolyte
There are three main reasons for the insufficient amount of electrolyte to affect the cycle. One is insufficient injection volume; the other is that although the injection volume is sufficient but the aging time is not enough, or the positive and negative materials are insufficiently immersed due to excessive compaction; The third is that the internal electrolyte of the circulating battery is consumed.
7. The objective conditions of the test
External factors during the test, such as charge and discharge rate, cut-off voltage, charge cut-off current, overcharge and overdischarge during the test, temperature, contact resistance between the test point and the cell, etc., may affect the test results of the cycle performance .
to sum up
Among the factors that affect the cycle performance of the battery, the final decisive factor, like the barrel principle, is the shortest among many factors. At the same time, these influencing factors also have mutual influence. With the same material and manufacturing capacity, the higher the cycle, the lower the energy density. How to find the meeting point of the demand and ensure the consistency of the battery core is the task.
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