Experimental degradation study of a commercial lithium-ion battery

In this study, we analyze data collected during the aging of 196 commercial lithium-ion cells with a silicon-doped graphite anode and nickel-rich NCA cathode. The cells are aged over a large range of calendar and cycle aging conditions. For different cells, these conditions are constant, alternating or randomly changing. The total test time and reached cycles are 697 days and 1500 equivalent full cycles for the calendar and cyclic aging tests respectively. A periodic check-up procedure was consistently performed at 20 °C controlled temperature, which allows for good comparability between different aging scenarios. During calendar aging, we quantify the influence of the check-up procedure, which significantly increases the aging observed after 697 days. For certain conditions, the degradation induced by the check-up even exceeds the pure calendar aging, which reveals that the lifetime of lithium-ion batteries was underestimated in previous studies and models.

本研究针对196颗商用锂离子电池的老化测试数据展开分析，这批电池采用硅掺杂石墨阳极（silicon-doped graphite anode）与富镍NCA正极（nickel-rich NCA cathode）。这批电池在大范围的日历老化与循环老化工况下开展老化测试，不同电池所承受的老化工况可分为恒定、交替或随机变化三类。其中，日历老化测试的总测试时长为697天，循环老化测试的等效满充放循环次数则达到1500次。所有测试均在20℃恒温环境下执行定期性能检测流程，以此确保不同老化工况间具备良好的可比性。在日历老化测试环节中，我们量化分析了定期性能检测流程的影响：该流程会显著提升697天测试后观测到的电池老化程度。在部分工况下，定期检测引发的电池衰减甚至超过了纯日历老化带来的衰减，这表明过往研究与模型对锂离子电池寿命的评估存在低估情况。

搜集汇总

背景与挑战

背景概述

该数据集包含196个商用锂离子电池在不同老化条件下的实验数据，揭示了定期检查程序对电池老化的重大影响，挑战了现有锂电池寿命预测模型。数据包括文本和表格形式，总容量26GB，涉及电化学、能源技术和机械工程领域。