TY - JOUR
T1 - Reversible and Fast (De)fluorination of High-Capacity Cu2O Cathode
T2 - One Step Toward Practically Applicable All-Solid-State Fluoride-Ion Battery
AU - Zhang, Datong
AU - Yamamoto, Kentaro
AU - Wang, Yanchang
AU - Gao, Shenghan
AU - Uchiyama, Tomoki
AU - Watanabe, Toshiki
AU - Takami, Tsuyoshi
AU - Matsunaga, Toshiyuki
AU - Nakanishi, Koji
AU - Miki, Hidenori
AU - Iba, Hideki
AU - Amezawa, Koji
AU - Maeda, Kazuhiko
AU - Kageyama, Hiroshi
AU - Uchimoto, Yoshiharu
N1 - Funding Information:
This work was supported by JST-Mirai Program (Grant Number JPMJMI18E2), Japan. Synchrotron radiation experiments were performed at beam lines BL01B1, BL02B2 and BL27SU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI, proposal numbers 2019A1016, 2019B1014, 2019B1015, 2019B1022, 2019B1500, 2020A1009, 2020A1010, 2020A1287 and 2020A1288). Acknowledgements are also issued to China Scholarship Council (No. 201806370208) and Kyoto University for their financial supports to D.-T. Z.
Funding Information:
This work was supported by JST‐Mirai Program (Grant Number JPMJMI18E2), Japan. Synchrotron radiation experiments were performed at beam lines BL01B1, BL02B2 and BL27SU of SPring‐8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI, proposal numbers 2019A1016, 2019B1014, 2019B1015, 2019B1022, 2019B1500, 2020A1009, 2020A1010, 2020A1287 and 2020A1288). Acknowledgements are also issued to China Scholarship Council (No. 201806370208) and Kyoto University for their financial supports to D.‐T. Z.
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/12/2
Y1 - 2021/12/2
N2 - All-solid-state fluoride-ion batteries (FIBs) are regarded as promising energy storage devices; however, currently proposed cathodes fail to meet the requirements for practical applications in terms of high energy density and high rate capability. Herein, the first use of stable and low-cost cuprous oxide (Cu2O) as a cathode material for all-solid-state FIBs with reversible and fast (de)fluorination behavior is reported. A phase-transition reaction mechanism involving Cu+/Cu2+ redox for charge compensation is confirmed, using the combination of electrochemical methods and X-ray absorption spectroscopy. The first discharge capacity is approximately 220 mAh g−1, and fast capacity fading is observed in the first five cycles, which is ascribed to partial structural amorphization. Compared with those of simple metal/metal fluoride systems, the material shows a superior rate capability, with a first discharge capacity of 110 mAh g−1 at 1 C. The rate-determining step and probable structural evolutions are investigated as well. It is believed that the comprehensive investigations of Cu2O as a cathode material described in this work can lead to an improved understanding of all-solid-state FIBs.
AB - All-solid-state fluoride-ion batteries (FIBs) are regarded as promising energy storage devices; however, currently proposed cathodes fail to meet the requirements for practical applications in terms of high energy density and high rate capability. Herein, the first use of stable and low-cost cuprous oxide (Cu2O) as a cathode material for all-solid-state FIBs with reversible and fast (de)fluorination behavior is reported. A phase-transition reaction mechanism involving Cu+/Cu2+ redox for charge compensation is confirmed, using the combination of electrochemical methods and X-ray absorption spectroscopy. The first discharge capacity is approximately 220 mAh g−1, and fast capacity fading is observed in the first five cycles, which is ascribed to partial structural amorphization. Compared with those of simple metal/metal fluoride systems, the material shows a superior rate capability, with a first discharge capacity of 110 mAh g−1 at 1 C. The rate-determining step and probable structural evolutions are investigated as well. It is believed that the comprehensive investigations of Cu2O as a cathode material described in this work can lead to an improved understanding of all-solid-state FIBs.
KW - all-solid-state
KW - cathodes
KW - fluoride-ion batteries
KW - mixed-anion
KW - rate capabilities
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U2 - 10.1002/aenm.202102285
DO - 10.1002/aenm.202102285
M3 - Article
AN - SCOPUS:85117575070
SN - 1614-6832
VL - 11
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 45
M1 - 2102285
ER -
