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成果報告書詳細
管理番号20190000000572
タイトル*2018年度中間年報 革新型蓄電池実用化促進基盤技術開発(国立大学法人神戸大学)
公開日2019/6/11
報告書年度2018 - 2018
委託先名国立大学法人神戸大学
プロジェクト番号P16001
部署名次世代電池・水素部
和文要約
英文要約Title: Research and Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING 2) (FY2016-FY2020) FY2018 Annual Report, Kobe University, Japan

The internal structure of the electrode slurry of novel conversion (nano interface) type battery was studied from rheological viewpoint, and then the drying behavior of the coated slurry was investigated in view of drying rate change and localization of binder. First of all, the electrode slurry was prepared according to common procedure, where concentrated slurry was first prepared and then gradually diluted by solvent. In this case, the drying rate was reduced in the latter stage of drying and the localization of binder was observed at the drying surface. This is probably caused by poor dispersion of particles in the slurry. Therefore, the composition of slurry in slurry preparation process was optimized with the consideration of slurry temperature change. The rheological behavior demonstrated that the optimization of slurry preparation process was effective for obtaining well dispersed slurry of active materials showing poor dispersibility. In fact, the slurry of the poorly dispersed active materials still showed high viscosity, and required to be subjected to high shear flow so as to achieve better dispersion state. The requirements of high shear dispersion devices were then studied using a rheometer having various geometries. As a result, it was found out that sufficiently large shear rate as well as narrow flow gap were indispensable for well dispersed battery slurry. The internal structure of the slurry was directly observed by using an atmospheric scanning electron microscopy (A-SEM) without any solidification processes. Although the corruption of observation window need to be overcome for stable A-SEM observation in near future, the progress of particle dispersion could be clearly seen. As a second topic, the effects of coating gap and drying temperature on the drying process of coated slurry prepared by the modified dispersion process were studied by measuring the change of the film thickness. In the case of the slurry prepared by modified preparation process, the film shrinking rate kept constant till the end of drying and no surface localization of binder was observed. The fact suggests that uniform distribution of particulate materials and binder in the slurry throughout the drying process. However, the generation of cracks was still observed when increasing coating gap and the localization of binder was again observed under higher drying rate condition. The optimization of drying condition with the consideration of internal structure of electrode slurry is strongly required.
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