增量容量分析（dQ / dV）的速率依赖性作为锂离子电池的诊断工具,Journal of Energy Storage

增量容量分析（ICA）是一种广泛使用的方法，可通过识别与活性物质相变相对应的峰来表征二次电池中的健康状态（SOH）。为了获得可靠的ICA，电池应在低恒定电流下循环以最大程度地减小电阻和扩散效应，从而难以部署到诸如电动汽车充电之类的应用中。

在这项工作中，通过峰检测算法对两个具有不同正极的锂离子电池进行定量分析，以定量分析充电/放电速率对ICA的影响。基于这些结果，介绍了一种用于快速ICA的新的鲁棒方法，该方法可通过使用电流中断的SOC相关电阻测量来校正峰值漂移。通过在Li（NiCoAl）O 2上进行的降解测试对这项新技术进行了评估/石墨电池。结果表明，在6小时（C / 6）充电期间的ICA代表了诊断准确性和实际应用充电时间之间的理想折衷。使用电阻校正，在C / 6时的ICA可以预测在48小时充电（C / 48）的0.59％内的峰值位置，相比之下，没有校正的1.90％。在老化下，与C / 24电荷相比，C / 6电荷能够正确识别每个峰的趋势，并将峰位置保持在2.0％以内。

当速率高于C / 6时，ICA中可识别的峰数减少，最明显的是在衰老的细胞中。经过200个循环后，在1C充电时只能看到一个可识别的峰，而在C / 6处只有四个可识别的峰，在C / 24处只有五个可识别的峰。

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Incremental capacity analysis (ICA) is a widely used method of characterising state of health (SOH) in secondary batteries through the identification of peaks that correspond to active material phase transformations. For reliable ICA, cells are cycled under low constant currents to minimise resistance and diffusion effects, making deployment into applications such as electric vehicle charging unfeasible.

In this work, the influence of charge/discharge rate on ICA is quantitively analysed through peak detection algorithms on two lithium-ion cells with different positive electrodes. Based on these results, a new robust method for faster ICA is introduced which corrects peak shift through SOC dependant resistance measurements using current interrupt. The new technique is evaluated through degradation tests on a Li(NiCoAl)O2/graphite cell. Results demonstrate that ICA during a 6-hour (C/6) charge represents an ideal compromise between diagnostic accuracy and realistic application charge times. ICA at C/6 can predict peak location within 0.59% of a 48-hour charge (C/48) using resistance correction, compared to 1.90% without correction. Under ageing, the C/6 charge was able to correctly identify the trend of each peak compared to C/24 charge and maintain peak location to within 2.0%.

At rates higher than C/6, the number of identifiable peaks in the ICA reduce, most noticeably in aged cells. After 200 cycles, only one identifiable peak was seen at 1C charge compared to four at C/6 and five at C/24.