Fig. 1 Classification of the Li ions based on the charge density obtained using the Bader method47Poster Award NomineeP1-03Lithium ion Transport Environment in Ion-Conducting GlassesKoji Ohara1,2, Satoshi Hiroi1, and Kentaro Kobayashi11 Faculty of Materials for Energy, Shimane University2 Research Center for Energy and Environmental Materials, NIMSControlling Li ion transport in glasses at atomic levels is key to realising all-solid-state batteries, a promising technology for electric vehicles. In this work, Li3PS4 glass, a promising solid electrolyte candidate, exhibits dynamic coupling between the Li+ cation mobility and the PS43− anion libration, which is commonly referred to as the paddlewheel eff ect [1]. In addition, it exhibits a concerted cation diff usion eff ect, which is regarded as the essence of high Li ion transport. However, the correlation between the Li+ ions within the glass structure can only be vaguely determined, due to the limited experimental information. We report that the Li ions present in glasses can be classified by evaluating their valence oscillations via Bader analysis to topologically analyse the chemical bonds. We found that three types of Li ions are present in Li3PS4 glass, and that the more mobile Li ions (i.e., the Li3-type ions) exhibit a characteristic correlation at relatively long distances of 4.0–5.0 Å [2]. [1] J. Smith et al., Nat. Commun, 11(1), 1483 (2020).[2] H. Yamada, K. Ohara, S. Hiroi et al., Energy & Environ. Mater., e12612 (2024). P1-04Microstructure of Light-emitting Phosphor of (Sr, Ca)AlSiN3:Eu2+Hajime Matsumoto1,2, Kyouta Ueda1,2, Masahiko Shimizu1,2, and Tomoyuki Kurushima1Kazutaka Mitsuishi2 and Naoto Hirosaki21 Mitsubishi Chemical Corp.2 National Institute for Materials Science(Sr,Ca)AlSiN3:Eu2+ (SCASN) has been well-known as a phosphor for white light-emitting diodes (WLEDs). SCASN has a narrower full width half maximum (FWHM) compared to CaAlSiN3:Eu2+ (CASN) [1]. Nevertheless, both have same crystal structure. Using SCASN as a red phosphor, WLEDs are easy to be color tunned, and have an excellent effi cacy. Thus we have further investigated into a microstructure of SCASN with TEM. [1] Kyota Uheda et al, “Luminescence properties of a red phosphor, CaAlSiN3: Eu2+ for white light emitting diodes”, Electrochemical and Solid-State Letters, 9 (4), H22 (2006).
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