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首页> 外文会议>International Advanced Automotive Battery Conference(AABC); 20040601-04; San Francisco,CA(US) >CHARACTERISATION AND MODELLING OF A HIGH-POWER DENSITY LITHIUM-ION POSITIVE ELECTRODE FOR HEV APPLICATION
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CHARACTERISATION AND MODELLING OF A HIGH-POWER DENSITY LITHIUM-ION POSITIVE ELECTRODE FOR HEV APPLICATION

机译：混合动力车用高密度锂离子正电极的表征与建模

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摘要

Electrochemical impedance spectroscopy (EIS) can be a powerful tool for the investigation of porous battery electrodes and battery cells. EIS allows discrimination between various sub-processes, having different time constants. In order to meaningfully evaluate the experimental data obtained with this method, mathematical models based on continuity, kinetic and transport equations, coupled with porous electrode theory, are required. The development of mathematical models allows interpretation of results with regards to the relevant physical processes taking place within the cell. This information can be used for various forms of battery monitoring, for example ageing. Several impedance studies of Li-ion battery electrodes (both positive and negative) have been performed previously. However, only a few groups have employed physically-based models. In this study, the impedance response of a porous electrode, based on LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 manufactured specifically for HEV use, was investigated. Firstly, an impedance model was developed based on previous work. Secondly, the model was evaluated by fitting it to half-cell experimental results for fresh electrodes at various SOC and with different electrolytes. Finally, the characteristic parameters for the electrode were obtained from the fitting results. The model is a first step towards developing an impedance model for an entire battery cell, which will be used in a project funded by the Swedish government and vehicle industry to investigate the ageing behaviour of lithium-ion batteries in HEV use.
机译：电化学阻抗谱（EIS）可以成为研究多孔电池电极和电池单元的有力工具。 EIS允许区分具有不同时间常数的各种子过程。为了有意义地评估使用此方法获得的实验数据，需要基于连续性，动力学和传输方程的数学模型，并结合多孔电极理论。数学模型的开发允许对有关细胞内发生的相关物理过程的结果进行解释。该信息可用于各种形式的电池监视，例如老化。以前已经对锂离子电池电极（正极和负极）进行了几项阻抗研究。但是，只有少数小组采用了基于物理的模型。在这项研究中，研究了基于专门用于混合动力汽车的LiNi_（0.8）Co_（0.15）Al_（0.05）O_2的多孔电极的阻抗响应。首先，在之前的工作基础上建立了阻抗模型。其次，通过将模型拟合到不同电极和不同电解质下的新鲜电极的半电池实验结果进行评估。最后，根据拟合结果获得电极的特征参数。该模型是开发整个电池单元阻抗模型的第一步，该模型将在瑞典政府和汽车工业资助的项目中使用，以调查HEV使用中锂离子电池的老化行为。

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