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Rheological behavior of concentrated slurry and wet granules for lithium ion battery electrodes
Advanced Powder Technology ( IF 5.2 ) Pub Date : 2020-10-23 , DOI: 10.1016/j.apt.2020.09.023
Takumi Kusano , Masahiko Ishii , Masaaki Tani , Osamu Hiruta , Takuro Matsunaga , Hiroshi Nakamura

Dynamic rheological behaviors of concentrated slurry and wet granules made of graphite, carboxymethyl cellulose, and water have been investigated, because there are few studies on wet granules despite the importance of controlling them. The internal structure and the rheological behaviors of the wet granules were compared with those of the concentrated slurry through the X-ray computed tomography (CT) observation and large amplitude oscillatory shear (LAOS) measurement. At small strain (1%), the concentrated slurry showed larger storage modulus G′ than loss modulus G″, that is, tanδ (=G″/G′) less than 1.0. In contrast, the wet granules indicated larger G″ than G′, that is, tanδ more than 1.0. This rheological behavior of wet granules seems to be attributed to the voids that was suggested to exist in the granular layer. On the other hand, at large strain (100%), the tanδ values of the wet granules were extremely higher than those of the slurry. It appears that this behavior of wet granules is due to the collapse of the granular layer indicated by the high second-harmonic intensities observed in the LAOS measurement. These results elucidated the change of rheological behavior from slurry to wet granules with increasing solid content.



中文翻译:

锂离子电池电极浓浆和湿颗粒的流变行为

研究了由石墨,羧甲基纤维素和水制成的浓浆和湿颗粒的动态流变行为,因为尽管对湿颗粒进行控制非常重要,但对湿颗粒的研究很少。通过X射线计算机断层扫描(CT)观察和大振幅振荡剪切(LAOS)测量,将湿颗粒的内部结构和流变行为与浓缩浆进行了比较。在小应变(1%),浓缩的淤浆表现出较大的储存模量“G比损耗模量G” ,即,黄褐色δ(= G“ / G' )小于1.0。与此相反,湿颗粒指示较大的G“大于G'即,棕褐色δ大于1.0。湿颗粒的这种流变行为似乎归因于建议存在于颗粒层中的空隙。在另一方面,在大的应变(100%),损耗角正切δ湿颗粒的值比淤浆的极其高。似乎湿颗粒的这种行为是由于在LAOS测量中观察到的高二次谐波强度表明了颗粒层的塌陷。这些结果阐明了随着固体含量的增加,流变行为从淤浆变成湿颗粒的变化。

更新日期:2020-11-22
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