LiCoO2电池正极微结构重构及有效传输系数预测
采用MonteCarlo方法重构了LiCoO2电池正极的三维微结构,重构单元的特征尺寸为几十纳米量级,从而得到了明确区分活性材料、固体添加物以及孔相(电解液)的微结构.通过对重构电极的特征化分析,得到了微结构中特定相的连通性和扭曲率、组分体积分数的空间分布、比表面积、孔径分布等特征信息.采用D3Q15格子Boltzmann模型(LBM)计算了该重构电极的有效热导率、电解液(或固相)的有效传输系数.同时发现,与随机行走方法以及Bruggemann关系式计算获得的扭曲率数值相比,LBM预测值更可靠....
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| Published in | 物理化学学报 Vol. 29; no. 11; pp. 2361 - 2370 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国科学院大学,北京100049%中国科学院广州能源研究所先进能源系统实验室,中国科学院可再生能源重点实验室,广州510640
2013
中国科学院广州能源研究所先进能源系统实验室,中国科学院可再生能源重点实验室,广州510640 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1000-6818 |
| DOI | 10.3866/PKU.WHXB201309032 |
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| Summary: | 采用MonteCarlo方法重构了LiCoO2电池正极的三维微结构,重构单元的特征尺寸为几十纳米量级,从而得到了明确区分活性材料、固体添加物以及孔相(电解液)的微结构.通过对重构电极的特征化分析,得到了微结构中特定相的连通性和扭曲率、组分体积分数的空间分布、比表面积、孔径分布等特征信息.采用D3Q15格子Boltzmann模型(LBM)计算了该重构电极的有效热导率、电解液(或固相)的有效传输系数.同时发现,与随机行走方法以及Bruggemann关系式计算获得的扭曲率数值相比,LBM预测值更可靠. |
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| Bibliography: | WU Wei, JIANG Fang-Ming, ZENG Jian-Bang(1 Laboratory of Advanced Energy Systems, CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Aeademy of Sciences, Guangzhou 510640, P. R. China; 2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China) 11-1892/06 Pore-scale modeling to lithium-ion battery; Microstructure reconstruction; Monte Carlo approach; Characterization; Tortuosity; Effective transport coefficient Lattice Boltzmann method: Random walk method Understanding the impact of microstructure of lithium-ion battery electrodes on performance is important for the development of relevant technologies. In the present work, the Monte Carlo Ising model was extended for the reconstruction of three-dimensional (3D) microstructure of a LiCoO2 lithium-ion battery cathode. The electrode is reconstructed with a resolution on the scale of 50 nanometers, which allows three individual phases to be evidently distinguished: LiCoO2 particles as the active material, pores or |
| ISSN: | 1000-6818 |
| DOI: | 10.3866/PKU.WHXB201309032 |