Data for: Analysis and modeling of cycle aging of a commercial LiFePO4/graphite cell

This data is from a comprehensive cycle aging study on a lithium-ion battery with a test duration of 29 months:
Naumann, M. et al.; Analysis and modeling of cycle aging of a commercial LiFePO4/graphite cell; Journal of Power Sources (2020), Volume 451; DOI: 10.1016/j.jpowsour.2019.227666

This aging study presents cycle aging results of a commercial lithium-ion cell from a comprehensive, 29 month aging study and follows up on calendar aging results published previously [1]. We use a widely used commercial LiFePO 4 /graphite cell from Sony/Murata, which promises long calendar and cycle lifetime, that would make it suitable for stationary battery applications. The evolution of the cells’ capacity and impedance are shown in a static cycle aging study for 19 test points with different combinations of temperature, C-rate, depth of discharge and state of charge. Based on the measurement data shown herein and the calendar aging model presented in the previous paper, a semi-empirical combined aging model is presented for the capacity loss and resistance increase.
Two dynamic load profiles are used to experimentally validate the combined aging model. Absolute model errors below 1% for the capacity loss and below 2% for the resistance increase in both dynamic load profiles demonstrate that the combined aging model can predict the lifetime of LiFePO 4 /graphite battery cells for different applications and varying operation conditions adequately. In the cycle experiments, an unexpectedly
strong, but partly reversible capacity loss is observed with shallow cycles at medium states of charge.

本数据集源自对锂离子电池的全面循环老化研究，测试周期长达29个月：Naumann, M. 等人；商业LiFePO4/石墨电池循环老化的分析与建模；电源期刊（2020年），第451卷；DOI：10.1016/j.jpowsour.2019.227666。该老化研究展示了源自全面29个月老化研究的商业锂离子电池的循环老化结果，并后续补充了先前发表的日历老化结果[1]。本研究采用索尼/村田公司生产的广泛使用的商业LiFePO4/石墨电池，其承诺具有较长的日历和循环寿命，使其适用于固定式电池应用。在静态循环老化研究中，针对19个测试点，展示了电池容量和阻抗在不同温度、放电倍率、放电深度和充电状态的组合下的演变。基于本报告所展示的测量数据和先前论文中提出的日子老化模型，提出了一种半经验联合老化模型，用于预测容量损失和电阻增加。采用两种动态负载曲线进行实验验证该联合老化模型。在两种动态负载曲线中，容量损失和电阻增加的绝对模型误差均低于1%和2%，证明了该联合老化模型能够充分预测适用于不同应用和不同操作条件的LiFePO4/石墨电池单元的寿命。在循环实验中，观察到在中等充电状态下浅循环存在一种意外强烈但部分可逆的容量损失。