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成果報告書詳細
管理番号20170000000240
タイトル*平成28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2017/11/14
報告書年度2016 - 2016
委託先名国立大学法人神戸大学
プロジェクト番号P16001
部署名スマートコミュニティ部
和文要約
英文要約Title: Research and Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING 2)  (FY2016-FY2018) FY2016 Annual Report,

In the development of innovative secondary batteries, the research on the process development including preparation, coating and drying of the slurry for electrodes must be carried out simultaneously with material development. The manufacturing process of the electrode should be established with the consideration of the various properties of materials to be used. We first decided the model slurry of innovative battery electrodes, and studied the effective preparation methods to obtain desirable slurry. The characteristic behavior of candidate materials was evaluated basically from rheological point of view.
Since candidate active materials usually has poor conductivity, the content of conductive aids must be increased. However, even in the well-controlled battery slurries of LIB, conductive aids, usually acetylene black (AB), form network structure in the slurry, which significantly affects its rheological behavior. AB slurry was thus chosen as a model system. Rheological characterization showed that AB slurry is highly elastic and has poor fluidity, having solid-like nature. Based on our knowledge on LIB, we investigated the effects of dispersion under high-shear dispersion or with micro-particles. High-shear condition sometimes resulted in too much dispersed slurry, finally leading to poor electro conductivity in the electrode after drying. As expected, we elucidated that higher shear rate condition can improve fluidity of solid-like AB slurry in spite of no effect of longer dispersion time. On the other hand, we found that solid-like AB slurry became more viscous after mixing with large “micron” active material particles in the case of LIB positive electrode slurry. Therefore, micron particles have a possibility for improving the dispersion of AB slurry. We found that no significant rheological change was observed for large particles. Meanwhile, the elasticity of AB slurry was drastically reduced using smaller particles. Since we found the appropriate particle size for the most dispersed slurry, it is expected to easily obtain well-dispersed electrode slurry using high-shear dispersion device when active materials for innovative batteries can be controlled within the appropriate size range.
The development of binder is also practical issue. We studied the basic behavior of solution of candidate binder for innovative secondary battery. It is found that that stable LIB slurry can be obtained because the candidate binder powder can be solved in the slurry preparation process. However, unstable slurry was obtained when using the candidate binder solution. The slurry preparation process with the use of the binder should be developed based on these findings.
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