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7 factors affecting the performance of lithium ion batteries

Importance of cycle performance of lithium ion batteries without many words, macro speaking, longer cycle life means less consumption of resources. Therefore, the factors affecting cycle performance of lithium ion battery is every and lithium industry stakeholders to consider the problem.

1, water

Too much water will react with the positive and negative polar material, destroy the structure and affect the circulation, but also the water is too much for the formation of SEI film.

2, positive and negative pole compaction

The positive and negative pole compaction is too high, although can improve the energy density, but also to some extent reduce the material's performance, from the theory to analyze, the greater the compaction, equivalent to the structure of the material, and the structure is to ensure that the lithium ion battery can use the foundation; in addition, the positive and negative pole of the electric core is difficult to guarantee higher, and the amount of liquid is the electric core to complete the normal cycle or more times.

3, the objective conditions of testing

Test in the process of charge and discharge rate and cut-off voltage, charging cut-off current test, over charge, room temperature test, test process of sudden interruption, test point with the electric core contact resistance and other external factors, will more or less affect test results of cycle performance, another, different sensitivity of different materials on the objective factors, uniform testing standards and understand common and important material properties should be enough work daily with the.

4, negative electrode

In addition to the negative effect of the first irreversible capacity and coating film density deviation, the impact on the cycle performance is also a consideration, for cobalt acid lithium graphite system, the negative graphite is the "short board" of the circular process is more common, if the cathode is not enough, the electric core may be in circulation, but the negative structure is destroyed seriously and can not fully accept the positive electrode provided by lithium ion.

5, coating film density

In the case of the same type of capacity with the capacity of the same volume with the same capacity with the same capacity with the same type of material, reducing the density of the same as the capacity of the same type of material, reducing the density of the electrolyte, and the amount of the material is more, in addition, the error may be more difficult to control. The foil material and the diaphragm, which means higher costs and lower energy density, therefore, need to be evaluated when the amount of the test is also required.

6, material type

Material is not selected to be reasonable, made of the material, even after making some problems, even after the completion of the material, even if the material is too far from the material, the material is determined by material, material, material, even though the material, even though the material, is determined by the material. The material is poor. The poor. One may be that the material can be. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that the material. One may be that. One may be that the material. One may be that. One may be that the material. One may be that the lithium. One may be that the material. One may be that. One may be that the material. One may be that. One may be that the material. One may be that. One may be that the material. One may be that. One may be that the material. One may be that. One may be that the material. One may be that. One may be that the material. One may be causing the side reaction of the active material and the electrolyte too soon, and the electrolyte is consumed and then the circulation is affected. In the design of the electric core, if the pole confirm the choice and poor cycle performance of materials, the other pole no need to choose the better cycle performance of materials and waste.

7, the amount of electrolyte

There are three reasons for the influence of the amount of electrolyte on the circulation

One, the injection volume is insufficient;

Second, although adequate liquid injection but aging time is not enough, or the positive and negative very due to compaction is too high and other reasons caused by the extract is not sufficient, and the third is with circulating inside the electricity core electrolyte is consumed is completed.

Three, positive and negative polarity, especially the matching between the anode and the electrolyte is compact and stable SEI formation, while the right eye visible performance, both for the circulation process of the consumption rate of the electrolyte, the SEI film can not effectively prevent the negative electrode and electrolyte, the SEI film has a defect in the site will be re generated SEI film to consume reversible lithium source and electrolyte. No matter what is the power of the cycle of hundreds or even thousands of times, the electric core, if the circulation of the electrolyte is sufficient and the circulation after the electrolyte has been consumed, the increase in the amount of electrolyte is likely to increase the performance of the cycle to a certain extent.


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