Elucidation of the structure of carbon electrodes for high-capacity/high-rate sodium ion battery
| Project/Area Number |
17K06017
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Okayama University |
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Principal Investigator |
Gotoh Kazuma 岡山大学, 自然科学研究科, 准教授 (20385975)
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | ナトリウムイオン電池 / 炭素 / ハードカーボン / 黒鉛層間化合物 / 固体NMR / 炭素材料 / 固体核磁気共鳴 / 負極 / グライム / クラウンエーテル / 核磁気共鳴 / 無機工業化学 |
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| Outline of Final Research Achievements |
Analyses of the state of sodium ions in closed-pore of carbon electrode for sodium ion batteries (NIBs) using solid state nuclear magnetic resonance (NMR) were performed. Dynamic behavior of organic molecules and cations in graphite intercalation compounds for an electrode of high-rate NIBs was also investigated. The fully sodiated sample prepared at higher carbonization temperature shows a higher 23Na NMR shift associated with Na clusters. The active motion of sodium－diglyme complexes is favorable for Na diffusion between graphene layers in the graphite intercalation compound. The deposition mechanism of Na metal on carbon electrode was also revealed.
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| Academic Significance and Societal Importance of the Research Achievements |
ナトリウムイオン電池炭素負極の高容量化には擬金属Naとして吸蔵されるナトリウムを増やすことが有効と考えられる。本研究では擬金属Naの生成と細孔サイズの関係を明らかにした。過充電時においても、ナトリウムはある程度までは炭素内部細孔に擬金属として貯蔵され、デンドライト析出を抑制するバッファーとして作用することを解明した。これらの結果は、炭素負極の高容量化や安全性評価に不可欠な情報であり、ナトリウムイオン電池実用化において学術的・社会的意義のある成果と考えられる。
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Report
(5 results)
Research Products
(47 results)
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[Journal Article] Structural Analysis of Sucrose-Derived Hard Carbon and Correlation with the Electrochemical Properties for Lithium, Sodium, and Potassium Insertion2020
Author(s)
Kei Kubota, Saori Shimadzu, Naoaki Yabuuchi, Satoshi Tominaka, Soshi Shiraishi, Maria Abreu-Sepulveda, Ayyakkannu Manivannan, Kazuma Gotoh, Mika Fukunishi, Mouad Dahbi and Shinichi Komaba
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Journal Title
Chemistry of Materials
Volume: 32
Issue: 7
Pages: 2961-2977
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] States of thermochemically or electrochemically synthesized NaxPy compounds analyzed by solid state 23Na and 31P nuclear magnetic resonance with theoretical calculation2019
Author(s)
Ryohei Morita, Kazuma Gotoh, Mouad Dahbi, Kei Kubota, Shinichi, Komaba, Kazuyasu Tokiwa, Saeid Arabnejad, Koichi Yamashita, Kenzo Deguchi, Shinobu Ohki, Tadashi Shimizu, Robert Laskowski, Hiroyuki Ishida
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Journal Title
J. Power Sources
Volume: 413
Pages: 418-424
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] 23Na solid state NMR analysis of sodium inserted in nanopore of hard carbon anode for sodium ion battery2017
Author(s)
Ryohei Morita, Kazuma Gotoh, Mika Fukunishi, Mouad Dahbi, Kei Kubota, Shinichi Komaba, Kenzo Deguchi, Shinobu Ohki, Tadashi Shimizu, Katsuyuki Kawamura, and Hiroyuki Ishidaa
Organizer
ISMAR2017
Related Report
Int'l Joint Research
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