Modeling and simulation of inhomogeneities in a 18650 nickel-rich, silicon-graphite lithium-ion cell during fast charging
Modeling and simulation of inhomogeneities in a 18650 nickel-rich, silicon-graphite lithium-ion cell during fast charging
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DOI：
10.1016/j.jpowsour.2018.11.043
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发表时间：
2018-11
影响因子：
9.2
通讯作者：
Johannes Sturm;Alexander Rheinfeld;I. Zilberman;F. Spingler;Stephan Kosch;Fabian Frie;A. Jossen
中科院分区：
文献类型：
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作者：
Johannes Sturm;Alexander Rheinfeld;I. Zilberman;F. Spingler;Stephan Kosch;Fabian Frie;A. Jossen
最近的高能锂离子电池含有高度致密的电极，但预计它们可以承受快速充电，而不会损害安全或加速老化。为了研究快速充电策略，我们使用了一个由多个Newman型电化学模型(P2D)和一个电热电池域模型组成的多维模型。利用高能18650 NMC-811/碳化硅锂离子电池的开路电位、红外热像和量热实验对模型进行了参数化和验证。首先，使用单个p2D模型比较了NMC-811/SIC和NMC-111/石墨电池的充电率能力。我们评估作为标签设计的函数的单个p2D模型相对于多维模型的建模误差。然后使用多维模型来研究不同的接片和电极设计对锂电镀的敏感性，这是基于局部阳极过电位和局部温度来评估的。通过实施阳极电位阈值，得出了将锂电镀风险降至最低的高速充电电流分布。结果表明，在不到18 的时间内，可以达到60%以上的荷电态。
Recent high-energy lithium-ion batteries contain highly densified electrodes, but they are expected to endure fast charging without safety compromises or accelerated aging. To investigate fast charging strategies, we use a multi-dimensional model consisting of several newman-type electrochemical models (p2D) coupled to an electrical-thermal cell domain model. Open-circuit potential, infrared thermography and calorimetry experiments of a high-energy 18650 NMC-811/SiC lithium-ion cell are used for model parameterization and validation. First, a single p2D model is used to compare the charging rate capabilities of NMC-811/SiC and NMC-111/graphite cells. We assess the modeling error of the single p2D model relative to the multi-dimensional model as a function of tab design. The multi-dimensional model is then used to study different tab and electrode designs regarding their susceptibility to lithium plating, which is evaluated based on local anode overpotential and local temperature. High-rate charging current profiles that minimize the risk of lithium plating are derived by implementing an anode potential threshold. We show that a state of charge beyond 60% can be reached in less than 18 min.