The Morphology of Battery Electrodes with the Focus of the Conductive Additives Paths
The Morphology of Battery Electrodes with the Focus of the Conductive Additives Paths
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DOI：
10.1149/2.0441510jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
Maira Indrikova;S. Grunwald;F. Golks;A. Netz;Bastian Westphal;A. Kwade
中科院分区：
文献类型：
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作者：
Maira Indrikova;S. Grunwald;F. Golks;A. Netz;Bastian Westphal;A. Kwade
使用绝缘陶瓷颗粒代替电极中的活性材料的模型实验显示了纯导电添加剂网络的重要性。陶瓷颗粒的选择粒径为10μm和3μm。制备了具有相似负载量和不同含量的炭黑、石墨和聚偏二氟乙烯的涂层，分析了电子电导率，并使用新的“准”原位 SEM 压缩方法进行了研究。电子电导率很大程度上取决于孔隙率、非活性材料的量和分布。 SEM/EDX 图像显示，与 3 μm 颗粒相比，10 μm 颗粒的涂层具有更高的孔隙率和更致密的导电添加剂网络。因此，导电助剂和粘结剂用量应根据粒度分布进行调整。
Model experiments, in which active material in the electrode is replaced with insulating ceramic particles, are used to show the importance of pure conductive additives network. Ceramic particles are chosen with particle diameter of 10 and 3 μm. Coatings with similar loading and varying levels of carbon black, graphite and polyvinylidene fluoride are fabricated, analyzed regarding electronic conductivity and investigated with a new" quasi" in-situ SEM compression method. The electronic conductivity strongly depends on porosity, inactive material amount and distribution. SEM/EDX images showed that coatings with 10 μm particles have higher porosity and denser network of conductive additives compared to 3 μm particles. Therefore, the conductive additives and binder amount should be adjusted based on the particle size distribution.