Multi-Particle Model for a Commercial Blended Lithium-Ion Electrode
Multi-Particle Model for a Commercial Blended Lithium-Ion Electrode
复制标题
商业混合锂离子电极的多粒子模型
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Zhongwei Chen
中科院分区：
文献类型：
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作者：
Z. Mao;M. Farkhondeh;M. Pritzker;M. Fowler;Zhongwei Chen
提出了一个数学模型来描述从商业锂离子电池中获得的LiNi 1/3 Mn 1/3Co 1/3 O2 − LiMn 2 O 4（NMC-LMO）混合阴极的电化学性能。该模型考虑了活性材料在三种分布方面的多种粒度：一种用于LMO颗粒，一种用于NMC初级颗粒，一种用于NMC次级颗粒，其可能是初级颗粒的团聚体。模拟和实验恒电流放电和微分电容曲线之间的良好匹配支持的假设，即二次粒子是无孔的条件下，其中施加的电流为2C及以下。扩散通量的物理一致性方程用于描述穿过活性颗粒的运输。相应的热力学因素估计从电极中存在的活性材料的平衡电位，而每个组件的粒度分布和有效的电子电导率已被直接测量。由于该模型能够准确地描述各种颗粒尺寸的利用率，并确定在不同的放电速率的每个组件的贡献，它可以作为一个有用的工具，用于定制的设计和预测的放电曲线的电极混合物由不同的活性材料具有一系列的颗粒尺寸。© 2015电化学学会。[DOI：10.1149/2.0321603jes]版权所有。
A mathematical model is presented to describe the electrochemical performance of a LiNi1/3Mn1/3Co1/3O2−LiMn2O4 (NMC-LMO) blended cathode obtained from a commercial lithium-ion battery. The model accounts for the multiple particle sizes of the active materials in terms of three distributions: one for LMO particles, one for NMC primary and one for NMC secondary particles which likely are agglomerates of primary particles. The good match between the simulated and experimental galvanostatic discharge and differential-capacity curves supports the assumption that the secondary particles are nonporous under conditions where currents of 2C and below are applied. A thermodynamically consistent equation for diffusive flux is used to describe transport across the active particles. The corresponding thermodynamic factors are estimated from the equilibrium potentials of the active materials present in the electrode, while the particle size distribution and effective electronic conductivities of each component have been directly measured. Since the model is able to accurately describe the utilization of the various particle sizes and determine the contribution of each component at different discharge rates, it can serve as a useful tool for customizing the designs and predicting the discharge profiles of electrode blends made up of different active materials having a range of particle sizes. © 2015 The Electrochemical Society. [DOI: 10.1149/2.0321603jes] All rights reserved.