Lithium-salt monohydrate melt: A stable electrolyte for aqueous lithium-ion batteries

Seongjae Ko; Yuki Yamada; Kasumi Miyazaki; Tatau Shimada; Eriko Watanabe; Yoshitaka Tateyama; Takeshi Kamiya; Tsunetoshi Honda; Jun Akikusa; Atsuo Yamada

Electrochemistry Communications (Jul 2019)

Lithium-salt monohydrate melt: A stable electrolyte for aqueous lithium-ion batteries

Seongjae Ko,
Yuki Yamada,
Kasumi Miyazaki,
Tatau Shimada,
Eriko Watanabe,
Yoshitaka Tateyama,
Takeshi Kamiya,
Tsunetoshi Honda,
Jun Akikusa,
Atsuo Yamada

Affiliations

Seongjae Ko: Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Yuki Yamada: Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan; Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan
Kasumi Miyazaki: Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Tatau Shimada: Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Eriko Watanabe: Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Yoshitaka Tateyama: Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan; Center for Green Research on Energy and Environmental Materials (GREEN) and International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
Takeshi Kamiya: Mitsubishi Materials Electronic Chemicals Co., Ltd., 3-1-6, Barajima, Akita City, Akita 010-8585, Japan
Tsunetoshi Honda: Advanced Products Company, Mitsubishi Materials Corporation, 1-6-1, Yokoami, Sumida-ku, Tokyo 130-0015, Japan
Jun Akikusa: Central Research Institute, Mitsubishi Materials Corporation, 1002-14, Mukohyama, Naka-shi, Ibaraki 311-0102, Japan
Atsuo Yamada: Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan; Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan; Corresponding author at: Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Journal volume & issue: Vol. 104

Abstract

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Concentrated aqueous electrolytes are promising for high-voltage and safe aqueous lithium-ion batteries because of their wide potential window. For Li system, a room-temperature dihydrate melt (27.8 mol kg−1) has been demonstrated to function as a stable aqueous electrolyte, but more concentrated electrolytes have yet to be discovered due to the limited solubility of Li salts. Here we report a room-temperature monohydrate melt of Li salts (55.5 mol kg−1) as an ultimate system of concentrated aqueous electrolytes. It has been discovered by adopting a Li salt with an asymmetric imide anion that shows ultra-high solubility in water. The monohydrate-melt electrolyte provides a wide potential window of ~5 V based on its dramatically improved passivation ability, which, for the first time, enables the Li-alloying reaction of Al in aqueous electrolytes. Keywords: Aqueous batteries, Electrolytes, Hydrate melts, Potential window

Published in Electrochemistry Communications

ISSN: 1388-2481 (Print); 1873-1902 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Technology: Chemical technology: Industrial electrochemistry; Science: Chemistry
Website: https://www.journals.elsevier.com/electrochemistry-communications

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