This paper uses several techniques to monitor the ageing of commercial LiFePO 4 cells, which are cycled at 55 °C and −20 °C at various depths of discharge. Ageing at lower depth of discharge leads to higher capacity fading, as compared to higher depth of discharge. The highest capacity fading is observed using 50% depth of discharge for cycling at 55 °C, while the lowest capacity fading is observed for the cells aged at 100% depth of discharge when cycled at −20 °C. Using incremental capacity analysis and differential voltage analysis the capacity fading is monitored and underlying ageing mechanisms are described. The loss of lithium inventory and the loss of active material, especially on the cathode side, are the major degradation mechanisms for the cells. The first incremental capacity analysis peak of the discharge process can be used in our case to predict remaining life and cell capacity.

中文翻译：

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循环曲线，放电深度和温度对商业LFP / C细胞老化的影响：使用ICA，DVA和OCV测量的细胞水平分析

本文使用多种技术来监测商用LiFePO 4电池的老化，这些电池在不同的放电深度分别在55°C和-20°C下循环。与较高的放电深度相比，较低放电深度的老化会导致较高的容量衰减。在55°C下使用50％放电深度观察到最高的容量褪色，而在-20°C下使用100％放电深度观察老化的电池则发现最低的容量褪色。使用增量容量分析和差分电压分析，可以监视容量衰减并描述潜在的老化机制。锂存量的减少和活性材料的损失，尤其是在阴极侧，是电池的主要降解机理。