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成果報告書詳細
管理番号20190000000616
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(学校法人関西大学)
公開日2019/6/14
報告書年度2018 - 2018
委託先名学校法人関西大学
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 (RISING2) (FY2016-FY2020) FY2018 Annual Report, Kansai University, Japan

Our (Prof. Ishikawa's) group has been devoted to the subject: "Improvement in reaction efficiency and cycleability of conversion cathode by novel binder" in the nanomaterial interface-controlled battery team in the cation migration-type battery group; the present results are as follows:
(1) Development of high mass-loading nano-sized conversion cathode by novel natural binder.
We are developing a binder compatible to FeF3. Last year, we succeeded in developing natural binder "Gen 3" applicable to DMSO-based nonaqueous slurry, achieving high FeF3 mass load, 118% of the target mass loading and a high solids concentration of 55%. Assuming an operating voltage of 2.75 V and a capacity of 680 mAh / g, this mass loading value is enough to achieve an intermediate target of 300 Wh / kg.
Based on the findings last year, we conducted a study to prepare a 'new Gen 3' binder that contributes to the final target value of 500 Wh / kg. The FeF3 mass loading of the electrode fabricated with this new binder reaches 173%, which is 1.3 times as high as the weight per unit area of the conventional Gen 3. This mass loading value is enough to achieve an intermediate target of 500 Wh / kg. Furthermore, we have found that the new Gen 3 binder improves the bonding strength compared to the conventional Gen 3 system (about 15% improvement) and that the resistances of the fabricated electrodes are equivalent.
(2) Research for natural binders applicable to vanadate glass.
Sudden capacity loss of FeF3 remains as a major problem. To solve this our group has proposed to simultaneously use FeF3 and active materials excellent in cycle characteristics such as vanadate glass. Here, we focused on suitable binder for vanadate glass, which is expected to have good cycle characteristics.
In this project, a common binder for LIB such as polyacrylic acid has been used for electrode preparation. However, there is a problem in preparation of slurry such as partial gelation, and optimization of binder remains to be addressed. We have worked on optimizing binder for vanadate glass, based on the result of applying the natural polymer-based binder to FeF3.
As a result of evaluating more than 15 types of natural substance type binder, it was found that a material candidate which suppresses gelation, is soluble in target solvents, and has good holding power for active material particles. A vanadate glass electrode with natural binder (vanadate glass : carbon additive : binder = 85 : 10 : 5) exhibited stable cycling performance with a Li metal anode in 1M LiPF6+EC/DMC between 1 and 4.5V at 0.1C-rate (1C-rate: 713 mA/g) and 25°C. The observed enough adhesive strength between foil and the active layer by the natural polymer binder should contribute to the stable cycle performance against the electrode volume change.
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