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成果報告書詳細
管理番号20190000000578
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(一般財団法人ファインセラミックスセンター)
公開日2019/6/11
報告書年度2018 - 2018
委託先名一般財団法人ファインセラミックスセンター
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 & Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING2); (FY2016-FY2020) FY2018 Annual Report

(1) Direct visualization of battery reactions at heterointerfaces
A technique for directly observing reactions in Zn-air battery half-cells was developed to determine the mechanisms behind Zn deposition and capacity loss. Several electrolytes, from ZnSO4 to Zn(OH2), were inserted between Pt electrodes in a transmission electron microscope sample holder, and at least one of the mechanisms behind formation of non-active Zn was revealed. We also successfully observed the dynamics of ZnO formation by applying a voltage bias. Future work will examine the effect of additives to the electrolyte under conditions closer to those in real batteries.

(2) In situ observations of intercalation reactions
A method for performing in situ observations of intercalation reactions in Li-ion battery anode materials using a piezo-driven probe was developed. In layered anode material MoS2, Li intercalation was detected as dark contrast rings resulting from lattice strain at the Li diffusion front. This method is being developed to directly observe Li intercalation in commercially important anode material carbon black, but is also expected to be useful for studying a wide range of other materials.

(3) Investigation of battery reaction mechanisms at interfaces
We combined scanning transmission electron microscopy (STEM) and theoretical modeling to characterize interfacial reactions in battery cathode materials. In the case of LiFePO4, a method using valence electron energy loss spectroscopy was successfully developed to visualize Li-ion concentration distributions across the LiFePO4/FePO4 interface. STEM characterization was also used to understand why pulsed laser deposited Li2MnO3/SrRuO3/α-Al2O3 and Li2MnO3/SrRuO3/SrTiO3 thin films exhibit similarly high capacities despite the substrates being very different. Despite the larger mismatch between SrRuO3 and α-Al2O3, they were found to form a coherent interface similar to that in the SrTiO3 system, allowing well-defined facets of Li2MnO3 to grow.

(4) Characterization of materials for innovative storage batteries
First-principles calculations of F ion conductivity behavior in graphite:
We performed first-principles molecular dynamics simulations of fluorinated graphite commencing from the FC6 structure, and compared the results with those of conventional anode material LiC6. Unlike in LiC6, in FC6 each charge carrier formed a strong covalent bond with a C atom and became fixed in place.
Microstructural characterization of cathode materials for conversion batteries:
Electron microscopy analysis of FeF3 is being performed to determine the mechanism behind the large hysteresis observed during charge-discharge. This work has so far revealed the importance of preparing samples that minimize non-active materials from the electrode, and efforts to produce such model samples are continuing.
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