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

Qifeng Zheng, Shota Miura, Kasumi Miyazaki, Seongjae Ko, Eriko Watanabe, Masaki Okoshi, Chien Pin Chou, Yoshifumi Nishimura, Hiromi Nakai, Takeshi Kamiya, Tsunetoshi Honda, Jun Akikusa, Yuki Yamada, Atsuo Yamada

研究成果: Article

抄録

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.

元の言語English
ジャーナルAngewandte Chemie - International Edition
DOI
出版物ステータスAccepted/In press - 2019 1 1

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Imides
Hydrates
Anions
Potassium
Negative ions
Sodium
Electric potential
Ions
Electrolytes
Alkali Metals
Alkali metals
Hydration
Eutectics
Salts
Electrodes
Molecules
Water
Costs

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

これを引用

Sodium- and Potassium-Hydrate Melts Containing Asymmetric Imide Anions for High-Voltage Aqueous Batteries. / Zheng, Qifeng; Miura, Shota; Miyazaki, Kasumi; Ko, Seongjae; Watanabe, Eriko; Okoshi, Masaki; Chou, Chien Pin; Nishimura, Yoshifumi; Nakai, Hiromi; Kamiya, Takeshi; Honda, Tsunetoshi; Akikusa, Jun; Yamada, Yuki; Yamada, Atsuo.

:: Angewandte Chemie - International Edition, 01.01.2019.

研究成果: Article

Zheng, Qifeng ; Miura, Shota ; Miyazaki, Kasumi ; Ko, Seongjae ; Watanabe, Eriko ; Okoshi, Masaki ; Chou, Chien Pin ; Nishimura, Yoshifumi ; Nakai, Hiromi ; Kamiya, Takeshi ; Honda, Tsunetoshi ; Akikusa, Jun ; Yamada, Yuki ; Yamada, Atsuo. / Sodium- and Potassium-Hydrate Melts Containing Asymmetric Imide Anions for High-Voltage Aqueous Batteries. :: Angewandte Chemie - International Edition. 2019.
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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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AU - Zheng, Qifeng

AU - Miura, Shota

AU - Miyazaki, Kasumi

AU - Ko, Seongjae

AU - Watanabe, Eriko

AU - Okoshi, Masaki

AU - Chou, Chien Pin

AU - Nishimura, Yoshifumi

AU - Nakai, Hiromi

AU - Kamiya, Takeshi

AU - Honda, Tsunetoshi

AU - Akikusa, Jun

AU - Yamada, Yuki

AU - Yamada, Atsuo

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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.

AB - 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.

KW - aqueous batteries

KW - asymmetric imide anion

KW - electrochemistry

KW - hydrates

KW - potential window expansion

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