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Effect of current on cycle aging of lithium ion batteries

机译：电流对锂离子电池循环老化的影响

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摘要

Nowadays, lithium ion batteries are increasingly spreading in different areas and therefore, it is very important to understand their aging behavior. According to the technical literature, battery aging can be dissociated in calendar aging and cycle aging. Calendar aging, in particular, depends on the temperature and state of charge (SoC). In addition to the previous factors, cycle aging also depends on the current rate, and charge/discharge cutoff voltages. In the literature, only a few papers have considered battery aging as a function of the charge/discharge current rate, but they agree that a higher current rate leads to faster battery aging. In any case, all of the tests have been conducted in a climactic chamber with a constant room temperature. However, even if the room temperature is controlled, for high current rates, the temperature of the battery cell increases, which makes it impossible to distinguish the aging due to the current from that due to the temperature. For this reason, in the present work, the authors focused on the lithium ion battery aging due to the current rate while maintaining a constant battery temperature using opportunely controlled Peltier cells. In this way, an interesting results was obtained, i.e. the cycle aging is not dependent on the current rate.
机译：如今，锂离子电池越来越多地蔓延，因此，了解其老化行为非常重要。根据技术文献，电池老化可以在日历老化和循环老化中解离。特别是日历老化取决于电荷（SOC）的温度和状态。除了先前的因素外，循环老化还取决于电流速率和充电/放电截止电压。在文献中，只有几篇论文认为电池老化是充电/放电电流率的函数，但它们同意更高的电流速率导致更快的电池老化。在任何情况下，所有测试都已在具有恒定室温的活性室中进行。然而，即使控制室温，对于高电流速率，电池单元的温度也会增加，这使得不可能将老化与由于温度的电流不同。因此，在本作工作中，作者集中在锂离子电池老化上，由于电流速率，同时使用适当控制的珀耳帖细胞保持恒定的电池温度。以这种方式，获得了一个有趣的结果，即循环老化不依赖于当前速率。

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