Volume 131, Issue 40 pp. 14340-14345
Zuschrift

Sodium- and Potassium-Hydrate Melts Containing Asymmetric Imide Anions for High-Voltage Aqueous Batteries

Dr. Qifeng Zheng

Dr. Qifeng Zheng

Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan

These authors contributed equally to this work.

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Shota Miura

Shota Miura

Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan

These authors contributed equally to this work.

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Kasumi Miyazaki

Kasumi Miyazaki

Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan

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Seongjae Ko

Seongjae Ko

Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan

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Eriko Watanabe

Eriko Watanabe

Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan

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Masaki Okoshi

Masaki Okoshi

Department of Chemistry and Biochemistry, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555 Japan

Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto, 615-8245 Japan

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Chien-Pin Chou

Chien-Pin Chou

Waseda Research Institute for Science and Engineering (WISE), Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555 Japan

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Yoshifumi Nishimura

Yoshifumi Nishimura

Waseda Research Institute for Science and Engineering (WISE), Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555 Japan

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Prof. Hiromi Nakai

Prof. Hiromi Nakai

Department of Chemistry and Biochemistry, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555 Japan

Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto, 615-8245 Japan

Waseda Research Institute for Science and Engineering (WISE), Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555 Japan

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Takeshi Kamiya

Takeshi Kamiya

Mitsubishi Materials Electronic Chemicals Co., Ltd., 3-1-6, Barajima, Akita city, Akita, 010-8585 Japan

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Tsunetoshi Honda

Tsunetoshi Honda

Advanced Products Company, Mitsubishi Materials Corporation, 1-6-1, Yokoami, Sumida-ku, Tokyo, 130-0015 Japan

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Jun Akikusa

Jun Akikusa

Central Research Institute, Mitsubishi Materials Corporation, 1002-14, Mukohyama, Naka-shi, Ibaraki, 311-0102 Japan

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Prof. Yuki Yamada

Prof. Yuki Yamada

Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan

Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto, 615-8245 Japan

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Prof. Atsuo Yamada

Corresponding Author

Prof. Atsuo Yamada

Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan

Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto, 615-8245 Japan

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First published: 30 July 2019
Citations: 19

Abstract

Aqueous Na- or K-ion batteries could virtually eliminate the safety and cost concerns raised from Li-ion batteries, but their widespread applications have generally suffered from narrow electrochemical potential window (ca. 1.23 V) of aqueous electrolytes that leads to low energy density. Herein, by exploring optimized eutectic systems of Na and K salts with asymmetric imide anions, we discovered, for the first time, room-temperature hydrate melts for Na and K systems, which are the second and third alkali metal hydrate melts reported since the first discovery of Li hydrate melt by our group in 2016. The newly discovered Na- and K- hydrate melts could significantly extend the potential window up to 2.7 and 2.5 V (at Pt electrode), respectively, owing to the merit that almost all water molecules participate in the Na+ or K+ hydration shells. As a proof-of-concept, a prototype Na3V2(PO4)2F3|NaTi2(PO4)3 aqueous Na-ion full-cell with the Na-hydrate-melt electrolyte delivers an average discharge voltage of 1.75 V, that is among the highest value ever reported for all aqueous Na-ion batteries.

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