TY - JOUR
T1 - Sodium- and Potassium-Hydrate Melts Containing Asymmetric Imide Anions for High-Voltage Aqueous Batteries
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
N1 - Funding Information:
The authors gratefully acknowledge the financial support from the Elements Strategy Initiative for Catalysts & Batteries (ESICB) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT). The authors are grateful to Dr. Yoshitaka Tateyama at National Institute for Materials Science for providing useful comments on this work. The computations were performed using Research Center for Computational Science in Japan and the facilities of the Supercomputer Center at the Institute for Solid State Physics from the University of Tokyo.
Funding Information:
The authors gratefully acknowledge the financial support from the Elements Strategy Initiative for Catalysts & Batteries (ESICB) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT). The authors are grateful to Dr. Yoshitaka Tateyama at National Institute for Materials Science for providing useful comments on this work. The computations were performed using Research Center for Computational Science in Japan and the facilities of the Supercomputer Center at the Institute for Solid State Physics from the University of Tokyo.
Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/10/1
Y1 - 2019/10/1
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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U2 - 10.1002/anie.201908830
DO - 10.1002/anie.201908830
M3 - Article
C2 - 31359550
AN - SCOPUS:85071388398
SN - 1433-7851
VL - 58
SP - 14202
EP - 14207
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 40
ER -