Aging Behavior Beyond SOH 80: An Experimental Aging Study on Commercial Lithium–Ion Batteries with Different Cathode Materials: Capacity Loss, Resistance Change and Impedance Modeling

IF 5.1 4区 材料科学 Q2 ELECTROCHEMISTRY
Sebastian Ohneseit, Marc C. Holocher, Alexis Kalk, Nils Uhlmann, Hans J. Seifert, Carlos Ziebert
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引用次数: 0

Abstract

New insights into lithium–ion battery aging behavior beyond a state of health of 80%, as well as for three different aging diagnostics and modeling methods, are obtained through this study conducted on four different cell types. Commercial cylindrical cells of type 21,700 are subjected to calendar aging and cyclic aging with different parameters in a long-term study. The impact of the aging parameters on the four different cathode materials assessed (lithium–nickel–manganese cobalt oxide (NMC), lithium–nickel–cobalt–aluminum oxide high energy (NCA-HE), lithium–nickel–cobalt–aluminum oxide high power, and lithium–iron phosphate oxide (LFP)) is examined with a portfolio of diagnostic methods: capacity test, Ohmic resistance test and the core of this study, impedance analysis, together with sophisticated equivalent circuit modeling (ECM). It was found that the NMC cell degraded fastest under all aging conditions, the most durable was in most cases the NCA-HE cell. Only for one cyclic aging procedure, the LFP cells performs the best. The diagnostics shows that quantitative analysis of Nyquist plots is not sufficient for aging tracking and that some aging effects can only be detected by pulse discharging test. Moreover, capacity and mean Ohmic resistance deduced from electrochemical impedance spectroscopy test allow extrapolation to forecast further aging under diverse aging conditions.

SOH 80以上的老化行为:不同正极材料商用锂离子电池的老化实验研究:容量损失、电阻变化和阻抗建模
通过对四种不同类型的电池进行研究,获得了超过80%健康状态下锂离子电池老化行为的新见解,以及三种不同的老化诊断和建模方法。对21700型商品圆柱形电池进行了历法老化和不同参数的循环老化试验。老化参数对四种不同正极材料(锂-镍-钴-钴氧化物(NMC)、锂-镍-钴-铝氧化物高能(NCA-HE)、锂-镍-钴-铝氧化物大功率和锂-磷酸铁氧化物(LFP))的影响通过一系列诊断方法进行了研究:容量测试、欧姆电阻测试和本研究的核心、阻抗分析以及复杂的等效电路建模(ECM)。结果表明,在所有老化条件下,NMC细胞降解速度最快,NCA-HE细胞寿命最长。仅在一个循环老化过程中,LFP细胞表现最好。诊断结果表明,Nyquist图的定量分析不足以进行老化跟踪,有些老化效应只能通过脉冲放电试验来检测。此外,从电化学阻抗谱测试中推导出的容量和平均欧姆电阻可以外推预测不同老化条件下的进一步老化。
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来源期刊
CiteScore
8.60
自引率
5.30%
发文量
223
期刊介绍: Electrochemical energy storage devices play a transformative role in our societies. They have allowed the emergence of portable electronics devices, have triggered the resurgence of electric transportation and constitute key components in smart power grids. Batteries & Supercaps publishes international high-impact experimental and theoretical research on the fundamentals and applications of electrochemical energy storage. We support the scientific community to advance energy efficiency and sustainability.
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