Intercalation mechanism of two dimensional battery materials studied by advanced TEMs
Project/Area Number |
22KF0245
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Project/Area Number (Other) |
22F22358 (2022)
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Research Category |
Grant-in-Aid for JSPS Fellows
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Allocation Type | Multi-year Fund (2023) Single-year Grants (2022) |
Section | 外国 |
Review Section |
Basic Section 28010:Nanometer-scale chemistry-related
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Research Institution | Osaka University |
Principal Investigator |
末永 和知 大阪大学, 産業科学研究所, 教授 (00357253)
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Co-Investigator(Kenkyū-buntansha) |
LIU QIUNAN 大阪大学, 産業科学研究所, 外国人特別研究員
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Project Period (FY) |
2023-03-08 – 2025-03-31
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Project Status |
Granted (Fiscal Year 2023)
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Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2024: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2023: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2022: ¥500,000 (Direct Cost: ¥500,000)
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Keywords | EELS / STEM / intercalation |
Outline of Research at the Start |
二次バッテリーの電極材料として有望なグラファイトなど二次元材料であるが、その正確なインターカレーション構造はいまだに明らかになっていない。本研究では最先端の電子顕微鏡を用いて、各種イオンと電極材料の相互作用を直接観察することにより、その内包メカニズムを原子レベルで明らかにする。これにより各種アルカリ金属や新構造をもつ積層構造物質の構造変化を実時間で観察し、バッテリー経年劣化の原因となる構造変化を確かめる。これらの実験は将来のエネルギー研究に基礎的な知見を与えることになる。
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Outline of Annual Research Achievements |
In the past year, our research focused on two main directions. Firstly, we achieved in-situ doping of five types of alkali metals on monolayer MoS2 using an electron beam in an advanced scanning electron microscope (STEM). Additionally, we obtained electronic structure fingerprint spectra of MoS2 with different phases using an advanced EELS system. These spectra included exciton spectra, Mo-L edge (representing the valence state of Mo), and S-L edge spectra.
Secondly, our research involved studying the structure of molybdenum chlorides (starting material: MoCl5) intercalated into bilayer graphene (BLG). Using STEM, we discovered that the intercalated material consists of MoCl3 networks, MoCl2 chains, and Mo5Cl10 rings. These observations revealed significant lattice distortions and frequent structural transitions in the 2D MoClx, which have not been observed in other metal chloride systems.
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Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
We completed the characterization of the results regarding the doping of five types of alkali metals on monolayer MoS2, as well as DFT calculations of electron charge transfer from alkali metal to MoS2. This work has the potential to offer valuable insights for future applications in energy, catalysis, electronic devices, and other fields. Currently, we are writing a paper based on this project. We have finalized the manuscript and already submitted. This work aims to enhance our understanding of the behavior of matter within the confined space of the vdW gap in BLG and provides valuable insights for more efficient tuning of material properties through intercalation, opening possibilities for potential applications. We hope for a successful publication of this paper soon.
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Strategy for Future Research Activity |
1 Complete the manuscript on the in-situ alkali metal doping of MoS2. 2 Continue intercalation experiments on various 2D materials, ranging from monolayer to multilayer structures. Additionally, establish a practical alkali metal-ion battery to study the ex-situ intercalation and de-intercalation processes of 2D electrode materials, enabling real-time monitoring of battery materials. 3 Utilize our advanced EELS system to quantitatively examine changes in the electronic structure of 2D materials resulting from alkali metal intercalation. Conduct systematic studies on the material's physical properties during different cycling stages of macroscopic battery processes. The aim is to provide a theoretical foundation for developing efficient, high-capacity, and long-lasting metal batteries.
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Report
(1 results)
Research Products
(1 results)