Room Temperature Operation of All-Solid-State Potassium-Ion Battery Enabled by Unconventional Ionic Solid Electrolyte K6[Rh4Zn4(l-cys)12O]·nH2O

Ryo Sakamoto; Kosuke Nakamoto; Atsushi Inoishi; Masato Ito; Nobuto Yoshinari; Takumi Konno; Yukihiro Hara; Takafumi Fujii; Shigeto Okada

doi:10.1002/asia.202401781

Room Temperature Operation of All-Solid-State Potassium-Ion Battery Enabled by Unconventional Ionic Solid Electrolyte K₆[Rh₄Zn₄(l-cys)₁₂O]·nH₂O

Ryo Sakamoto
, Kosuke Nakamoto
, Atsushi Inoishi
, Masato Ito
, Nobuto Yoshinari
, Takumi Konno
, Yukihiro Hara
, Takafumi Fujii
, Shigeto Okada

Research output: Contribution to journal › Article › peer-review

Abstract

The unconventional ionic solid, K₆[Rh₄Zn₄(L-cys)₁₂O]·nH₂O, exhibited excellent formability as well as high ionic conductivity. These features enabled a straightforward assembly of all-solid-state potassium-ion battery: A cold-pressed solid sample of K₆[Rh₄Zn₄(L-cys)₁₂O]·nH₂O, which was sandwiched by solid samples of K₂Ni[Fe(CN)₆] and chloranil as cathode, and anode, respectively, displayed an initial discharge capacity of 21.6 mAh g⁻¹-electrodes at 25 °C at a current density of 0.5 mA cm⁻² (∼0.34C). Energy dispersive X-ray spectroscopy analysis confirmed that K⁺ ions swiftly conduct through K₆[Rh₄Zn₄(L-cys)₁₂O]·nH₂O between the cathode and anode during charge–discharge cycles.

Original language	English
Article number	e202401781
Journal	Chemistry - An Asian Journal
Volume	20
Issue number	11
DOIs	https://doi.org/10.1002/asia.202401781
Publication status	Published - Jun 2 2025

All Science Journal Classification (ASJC) codes

Biochemistry
General Chemistry
Organic Chemistry

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title = "Room Temperature Operation of All-Solid-State Potassium-Ion Battery Enabled by Unconventional Ionic Solid Electrolyte K6[Rh4Zn4(l-cys)12O]·nH2O",

abstract = "The unconventional ionic solid, K6[Rh4Zn4(L-cys)12O]·nH2O, exhibited excellent formability as well as high ionic conductivity. These features enabled a straightforward assembly of all-solid-state potassium-ion battery: A cold-pressed solid sample of K6[Rh4Zn4(L-cys)12O]·nH2O, which was sandwiched by solid samples of K2Ni[Fe(CN)6] and chloranil as cathode, and anode, respectively, displayed an initial discharge capacity of 21.6 mAh g−1-electrodes at 25 °C at a current density of 0.5 mA cm−2 (∼0.34C). Energy dispersive X-ray spectroscopy analysis confirmed that K+ ions swiftly conduct through K6[Rh4Zn4(L-cys)12O]·nH2O between the cathode and anode during charge–discharge cycles.",

keywords = "All-solid-state battery, Noncoulombic ionic solid, Potassium-ion battery, Solid electrolyte",

author = "Ryo Sakamoto and Kosuke Nakamoto and Atsushi Inoishi and Masato Ito and Nobuto Yoshinari and Takumi Konno and Yukihiro Hara and Takafumi Fujii and Shigeto Okada",

note = "Publisher Copyright: {\textcopyright} 2025 Wiley-VCH GmbH.",

year = "2025",

month = jun,

day = "2",

doi = "10.1002/asia.202401781",

language = "English",

volume = "20",

journal = "Chemistry - An Asian Journal",

issn = "1861-4728",

publisher = "John Wiley and Sons Ltd",

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T1 - Room Temperature Operation of All-Solid-State Potassium-Ion Battery Enabled by Unconventional Ionic Solid Electrolyte K6[Rh4Zn4(l-cys)12O]·nH2O

AU - Sakamoto, Ryo

AU - Nakamoto, Kosuke

AU - Inoishi, Atsushi

AU - Ito, Masato

AU - Yoshinari, Nobuto

AU - Konno, Takumi

AU - Hara, Yukihiro

AU - Fujii, Takafumi

AU - Okada, Shigeto

PY - 2025/6/2

Y1 - 2025/6/2

N2 - The unconventional ionic solid, K6[Rh4Zn4(L-cys)12O]·nH2O, exhibited excellent formability as well as high ionic conductivity. These features enabled a straightforward assembly of all-solid-state potassium-ion battery: A cold-pressed solid sample of K6[Rh4Zn4(L-cys)12O]·nH2O, which was sandwiched by solid samples of K2Ni[Fe(CN)6] and chloranil as cathode, and anode, respectively, displayed an initial discharge capacity of 21.6 mAh g−1-electrodes at 25 °C at a current density of 0.5 mA cm−2 (∼0.34C). Energy dispersive X-ray spectroscopy analysis confirmed that K+ ions swiftly conduct through K6[Rh4Zn4(L-cys)12O]·nH2O between the cathode and anode during charge–discharge cycles.

AB - The unconventional ionic solid, K6[Rh4Zn4(L-cys)12O]·nH2O, exhibited excellent formability as well as high ionic conductivity. These features enabled a straightforward assembly of all-solid-state potassium-ion battery: A cold-pressed solid sample of K6[Rh4Zn4(L-cys)12O]·nH2O, which was sandwiched by solid samples of K2Ni[Fe(CN)6] and chloranil as cathode, and anode, respectively, displayed an initial discharge capacity of 21.6 mAh g−1-electrodes at 25 °C at a current density of 0.5 mA cm−2 (∼0.34C). Energy dispersive X-ray spectroscopy analysis confirmed that K+ ions swiftly conduct through K6[Rh4Zn4(L-cys)12O]·nH2O between the cathode and anode during charge–discharge cycles.

KW - All-solid-state battery

KW - Noncoulombic ionic solid

KW - Potassium-ion battery

KW - Solid electrolyte

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UR - https://www.scopus.com/pages/publications/105002128274#tab=citedBy

U2 - 10.1002/asia.202401781

DO - 10.1002/asia.202401781

M3 - Article

C2 - 40195818

AN - SCOPUS:105002128274

SN - 1861-4728

VL - 20

JO - Chemistry - An Asian Journal

JF - Chemistry - An Asian Journal

IS - 11

M1 - e202401781

ER -

Room Temperature Operation of All-Solid-State Potassium-Ion Battery Enabled by Unconventional Ionic Solid Electrolyte K₆[Rh₄Zn₄(l-cys)₁₂O]·nH₂O

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