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Factors affecting the performance of lithium-ion batteries

1. Moisture

Excessive moisture can cause side reactions with positive and negative polar active substances, damage their structure, and affect circulation. At the same time, excessive moisture is not conducive to the formation of SEI membranes. However, while trace amounts of moisture are difficult to remove, trace amounts of water can also ensure the performance of the cell to a certain extent.

2. Positive and negative pole compaction

Excessive compaction of the positive and negative electrodes can increase the energy density of the battery cell, but it can also reduce the cycling performance of the material to a certain extent. From a theoretical analysis, the greater the compaction, the greater the structural damage to the material, and the material structure is the basis for ensuring the recyclability of lithium-ion batteries; In addition, cells with high positive and negative electrode compaction are difficult to ensure a high liquid retention, which is the foundation for the cell to complete normal or more cycles.

3. Objective conditions for testing

External factors such as charge discharge ratio, cutoff voltage, charge cut-off current, overcharge and discharge during the test, test room temperature, sudden interruption during the test, contact internal resistance between the test point and the electric core, etc., will more or less affect the test results of cycle performance. In addition, different materials have different sensitivity to the above objective factors, Unifying testing standards and understanding common and important material characteristics should be sufficient for daily work use.

4. Excessive negative electrode

The reason for excessive negative electrode not only needs to consider the influence of the first irreversible capacity and the deviation of coating film density, but also the impact on cycling performance. Regarding the lithium cobalt oxide plus graphite system, it is common for negative electrode graphite to become a short board during the cycling process. If the negative electrode excess is not sufficient, the lithium cell may not precipitate lithium before cycling, However, after several hundred cycles, the positive electrode structure changed very little, but the negative electrode structure was severely damaged and could not fully receive the lithium ions supplied by the positive electrode, resulting in premature capacity reduction.

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