Synthesis of ultrasmall Li-Mn spinel oxides exhibiting unusual ion exchange, electrochemical, and catalytic properties

Yumi Miyamoto, Yoshiyuki Kuroda, Tsubasa Uematsu, Hiroyuki Oshikawa, Naoya Shibata, Yuichi Ikuhara, Kosuke Suzuki, Mitsuhiro Hibino, Kazuya Yamaguchi, Noritaka Mizuno

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Abstract

The efficient surface reaction and rapid ion diffusion of nanocrystalline metal oxides have prompted considerable research interest for the development of high functional materials. Herein, we present a novel low-temperature method to synthesize ultrasmall nanocrystalline spinel oxides by controlling the hydration of coexisting metal cations in an organic solvent. This method selectively led to Li-Mn spinel oxides by tuning the hydration of Li+ ions under mild reaction conditions (i.e., low temperature and short reaction time). These particles exhibited an ultrasmall crystallite size of 2.3nm and a large specific surface area of 371±15 m 2 g '1. They exhibited unique properties such as unusual topotactic Li +/H + ion exchange, high-rate discharge ability, and high catalytic performance for several aerobic oxidation reactions, by creating surface phenomena throughout the particles. These properties differed significantly from those of Li-Mn spinel oxides obtained by conventional solid-state methods.

Original languageEnglish
Article number15011
JournalScientific Reports
Volume5
DOIs
Publication statusPublished - 2015 Oct 12

ASJC Scopus subject areas

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    Miyamoto, Y., Kuroda, Y., Uematsu, T., Oshikawa, H., Shibata, N., Ikuhara, Y., Suzuki, K., Hibino, M., Yamaguchi, K., & Mizuno, N. (2015). Synthesis of ultrasmall Li-Mn spinel oxides exhibiting unusual ion exchange, electrochemical, and catalytic properties. Scientific Reports, 5, [15011]. https://doi.org/10.1038/srep15011