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Excessive negative electrode: During the cycling process of lithium-ion batteries, the negative electrode material continuously receives embedded lithium ions, and after prolonged cycling, the structure of the negative electrode material is severely damaged. So when designing lithium-ion batteries, we need to use an appropriate excess of negative electrode materials. If the negative electrode is excessive or insufficient, the battery cell may not precipitate lithium before cycling, but after several hundred cycles, the positive electrode structure changes very little, but the negative electrode structure is severely damaged and cannot fully receive the lithium ions supplied by the positive electrode, resulting in lithium precipitation and premature capacity decrease.

Electrolyte quantity: Insufficient electrolyte quantity has three important reasons for the impact on circulation. One is insufficient liquid injection. When the liquid injection is insufficient, the battery is in the circulation process. Lithium ions cannot conduct normal conduction, resulting in a decrease in the capacity of lithium-ion batteries. Secondly, although the injection amount is sufficient, the aging time is insufficient, or the immersion of the positive and negative electrodes is insufficient due to high compaction. If the battery is not fully soaked and there is no electrolyte on the surface of the electrode, the corresponding electrode cannot exert its corresponding gram capacity, resulting in a decrease in the capacity of the battery. Thirdly, as the electrolyte inside the circulating cell is consumed, the microscopic manifestation 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 visible manifestation in the right eye is the rate of electrolyte consumption during the cycling process. On the one hand, an incomplete SEI film cannot effectively prevent side reactions between the negative electrode and the electrolyte, thereby consuming the electrolyte. On the other hand, in areas with defects in the SEI film, the SEI film will regenerate as the cycle progresses, thereby consuming reversible lithium sources and electrolytes. Whether it is for cells that have been cycled hundreds or even thousands of times, or for cells that have already dived dozens of times, if the electrolyte is sufficient before cycling and has already been consumed after cycling, the addition of electrolyte retention is likely to improve their cycling performance to some extent.

Objective conditions for testing: External factors such as charging and discharging rate, cut-off voltage, charging cut-off current, overcharging and discharging during the testing process, temperature of the testing room, sudden interruption during the testing process, contact internal resistance between the testing point and the battery cell, etc., all have a greater or lesser impact on the cycling performance test results.

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