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A new high-voltage calcium intercalation host for ultra-stable and high-power calcium rechargeable batteries

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Title
A new high-voltage calcium intercalation host for ultra-stable and high-power calcium rechargeable batteries
Author(s)
Xu, Zheng-Long; Park, Jooha; Wang, Jian; Moon, Hyunseok; Yoon, Gabin; Lim, Jongwoo; Ko, Yoon-Joo; Cho, Sung-Pyo; Lee, Sang-Young; Kisuk Kang
Publication Date
2021-06-07
Journal
Nature Communications, v.12, no.1
Publisher
Nature Publishing Group
Abstract
© 2021, The Author(s).Rechargeable calcium batteries have attracted increasing attention as promising multivalent ion battery systems due to the high abundance of calcium. However, the development has been hampered by the lack of suitable cathodes to accommodate the large and divalent Ca2+ ions at a high redox potential with sufficiently fast ionic conduction. Herein, we report a new intercalation host which presents 500 cycles with a capacity retention of 90% and a remarkable power capability at ~3.2 V (vs. Ca/Ca2+) in a calcium battery. The cathode material derived from Na0.5VPO4.8F0.7 is demonstrated to reversibly accommodate a large amount of Ca2+ ions, forming a series of CaxNa0.5VPO4.8F0.7 (0 < x < 0.5) phases without any noticeable structural degradation. The robust framework enables one of the smallest volume changes (1.4%) and the lowest diffusion barriers for Ca2+ among the cathodes reported to date, offering the basis for the outstanding cycle life and power capability.
URI
https://pr.ibs.re.kr/handle/8788114/10800
DOI
10.1038/s41467-021-23703-x
ISSN
2041-1723
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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