Potassium single cation ionic liquid electrolyte for potassium-ion batteries
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- Yamamoto, Hiroki
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL)・Institute of Advanced Industrial Science and Technology (AIST)・Graduate School of Energy Science, Kyoto University
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- Chen, Chih-Yao
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL)・Institute of Advanced Industrial Science and Technology (AIST)
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- Kubota, Keigo
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL)・Institute of Advanced Industrial Science and Technology (AIST)・Graduate School of Energy Science, Kyoto University
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- Matsumoto, Kazuhiko
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL)・Institute of Advanced Industrial Science and Technology (AIST)・Graduate School of Energy Science, Kyoto University
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- Hagiwara, Rika
- AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL)・National Institute of Advanced Industrial Science and Technology (AIST)・Graduate School of Energy Science, Kyoto University
Abstract
Potassium-ion batteries (PIBs) are a promising post-lithium-ion battery (LIB), as their resources are abundant and low-cost and may have a higher voltage than LIBs. However, the high operating voltage and extremely high reactivity of potassium metal require a chemically safe electrolyte with oxidative and reductive stabilities. In this study, a potassium single cation ionic liquid (K-SCIL), which contains only K⁺ as the cationic species and has a high electrochemical stability, low flammability, and low vapor pressure, is developed as an electrolyte for PIBs. The mixture of potassium bis(fluorosulfonyl)amide and potassium (fluorosulfonyl)(trifluoromethylsulfonyl)amide at a molar ratio of 55:45 had the lowest melting point of 67 °C. The K⁺ concentration in this K-SCIL is high (8.5 mol dm⁻³ at 90 °C) due to the absence of solvents and bulky organic cations. In addition, the electrochemical window is as wide as 5.6 V, which enables the construction of PIBs with a high energy density. A high current density can be achieved with this K-SCIL, owing to the absence of a K⁺ concentration gradient. The electrolyte was successfully used with a graphite negative electrode, enabling the reversible intercalation/deintercalation of K⁺, as confirmed by X-ray diffraction.
Journal
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- The Journal of Physical Chemistry B
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The Journal of Physical Chemistry B 124 (29), 6341-6347, 2020-07-23
American Chemical Society (ACS)
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Details 詳細情報について
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- CRID
- 1050569159935483648
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- NII Article ID
- 120006942804
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- ISSN
- 15206106
- 15205207
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- HANDLE
- 2433/260566
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- Crossref
- CiNii Articles
- KAKEN