Modeling the impedance versus voltage characteristics of LiNi0.8Co0.15Al0.05O2
Modeling the impedance versus voltage characteristics of LiNi0.8Co0.15Al0.05O2
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DOI：
10.1016/j.electacta.2007.09.018
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发表时间：
2008-01-01
影响因子：
6.6
通讯作者：
Dees, D. W.
中科院分区：
文献类型：
--
作者：
Abraham, D. P.;Kawauchi, S.;Dees, D. W.
基于lini0.8 co0.15 al0.05 o2的锂离子电池正极的功率传输能力与电池的充电状态有很大的关系。这种行为的一个原因是正极的阻抗随氧化物的锂含量而变化。本文在基于电化学模型的浓油溶液中，利用多孔电极理论对阻抗数据进行建模，得到基于lini0.8 co0.15 al0.05 o2的油正极对Li的电荷电位在3.55 ~ 4.55 V之间。模型拟合得到的参数包括交换电流密度和锂离子在氧化物中的扩散系数。这些参数随氧化电位的变化与在锂离子插入-脱插反应中观察到的材料结构变化有关。(C) 2007 Elsevier Ltd.版权所有。
The power-delivery capability of lithium-ion cells based oil LiNi0.8Co0.15Al0.05O2-based positive electrodes shows a significant dependence oil the cell's state-of-charge. One reason for this behavior is the variation of the positive electrode's impedance with the oxide's lithium content. In this article, in electrochemical model based oil concentrated solution porous electrode theory is used to model impedance data obtained oil LiNi0.8Co0.15Al0.05O2-based positive electrodes charged to potentials ranging from 3.55 to 4.55 V Versus Li. The parameters obtained from model fits include the exchange-current density and Li-ion diffusion coefficients in the oxide. The variations in these parameters with oxide potential are correlated with structural changes in the material observed during Li-ion intercalation-deintercalation reactions. (C) 2007 Elsevier Ltd. All rights reserved.