Effects of Oxide Morphology on Lithium-Ion Conductivity of LiBH4-Al2O3 Composites

Mizuochi, Hiroki; Nakagawa, Yuki; Shibayama, Tamaki; Yao, Yuchen; Guo, Fangqin; Miyaoka, Hiroki; Ichikawa, Takayuki

Effects of Oxide Morphology on Lithium-Ion Conductivity of LiBH4-Al2O3 Composites

Mizuochi, Hiroki; Nakagawa, Yuki; Shibayama, Tamaki et al.

ACS applied energy materials, 2025, 8(1), 518-528

Permalink : https://hdl.handle.net/2115/97358

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アクセス権	open access
URI	https://hdl.handle.net/2115/97358
タイトル	Effects of Oxide Morphology on Lithium-Ion Conductivity of LiBH4-Al2O3 Composites
著者	Mizuochi, Hiroki ; Nakagawa, Yuki ; Shibayama, Tamaki ; Yao, Yuchen ; Guo, Fangqin ; Miyaoka, Hiroki ; Ichikawa, Takayuki
著者名 Mizuochi, Hiroki
e-Rad_Researcher 00787153 著者名 Nakagawa, Yuki
e-Rad_Researcher 10241564 著者名 Shibayama, Tamaki
著者名 Yao, Yuchen
著者名 Guo, Fangqin
著者名 Miyaoka, Hiroki
著者名 Ichikawa, Takayuki
言語	英語
キーワード	solid electrolytes
	lithium-ion batteries
	dynamics
	solid-state NMR
	complex metal hydrides
発行日	2025-01-13
出版者	American Chemical Society
収録物名	ACS applied energy materials
巻(号)	8(1)
ページ	518-528
抄録	The ionic conductivity of LiBH4-Al2O3 composites was investigated, focusing on the effects of oxide morphology and surface functional groups. Composites were prepared by mixing mesoporous Al2O3 (wormhole), gamma Al2O3, and nanofiber Al2O3. All composites showed an improvement in ionic conductivity, with the 55 wt % mesoporous composites showing the highest ionic conductivity (4.6 x 10-5 S cm-1 at 30 degrees C) and lowest activation energy for ionic conduction (0.53 eV for 30-100 degrees C). Notably, 7Li static nuclear magnetic resonance revealed that only the mesoporous composites exhibited a motionally narrowed line, indicative of highly mobile lithium ions. The proportion of highly mobile lithium ions in all composites was found to correlate with the specific surface area and specific pore volume of each Al2O3 type. Multiple structural analyses indicated the existence of fast lithium-ion conduction layers at the interface between LiBH4 and Al2O3. Additionally, the influence of mesoporous Al2O3 surface functional groups on the ionic conductivity was explored. This study highlights the potential of using different oxide morphologies to better understand and visualize ionic conductivity enhancement interfaces.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © 2024 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/articlesonrequest/AOR-TV9XBHDINN8RZREGHMZS.
PISSN	2574-0962
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1021/acsaem.4c02653