Thick electrodes for Li-ion batteries: A model based analysis
Thick electrodes for Li-ion batteries: A model based analysis
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DOI：
10.1016/j.jpowsour.2016.09.143
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发表时间：
2016-12-01
影响因子：
9.2
通讯作者：
Latz, Arnulf
中科院分区：
文献类型：
--
作者：
Danner, Timo;Singh, Madhav;Latz, Arnulf
锂离子电池由于其出色的能量和功率密度而常用于便携式电子设备中。阻碍突破的一个遗留问题是高生产成本，例如在汽车行业。对于低功率应用，例如固定存储，建议电极厚度大于300 μ m的电池。仅用几个电极层就可以获得高能量密度，这减少了生产时间和成本。然而，由于长的传输路径，质量和电荷传输限制在已经很小的C-速率下可能是严重的。在本文中，我们使用详细的3D微观结构解析模型来研究电池性能的限制因素。该模型参数化的数据从文献和专门的实验，并显示出良好的定性协议与实验放电曲线的厚NMC石墨锂离子电池。该模型用于评估炭黑分布不均匀性的影响，并给出电池充电过程中可能发生锂电镀的答案。基于我们的模拟，我们可以预测未来采用厚电极的锂离子电池的最佳操作策略和改进的设计概念。(C)2016爱思唯尔B. V.保留所有权利。
Li-ion batteries are commonly used in portable electronic devices due to their outstanding energy and power density. A remaining issue which hinders the breakthrough e.g. in the automotive sector is the high production cost. For low power applications, such as stationary storage, batteries with electrodes thicker than 300 Am were suggested. High energy densities can be attained with only a few electrode layers which reduces production time and cost. However, mass and charge transport limitations can be severe at already small C-rates due to long transport pathways. In this article we use a detailed 3D microstructure resolved model to investigate limiting factors for battery performance. The model is parametrized with data from the literature and dedicated experiments and shows good qualitative agreement with experimental discharge curves of thick NMC-graphite Li-ion batteries. The model is used to assess the effect of inhomogeneities in carbon black distribution and gives answers to the possible occurrence of lithium plating during battery charge. Based on our simulations we can predict optimal operation strategies and improved design concepts for future Li-ion batteries employing thick electrodes. (C) 2016 Elsevier B.V. All rights reserved.