期刊
ACS ENERGY LETTERS
卷 4, 期 6, 页码 1328-1335出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00830
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资金
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Natural Science Foundation of China [51832004, 51521001, 11404230]
- National Key Research and Development Program of China [2016YFA0202601]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Yellow Crane Talent (Science & Technology) Program of Wuhan City
The calcium-ion battery is an emerging energy storage system that has attracted considerable attention recently. However, the absence of high-performance cathode materials is one of the main challenges for the development of calcium-ion batteries. Herein, a bilayered Mg0.25V2O5 center dot H2O as a stable cathode for rechargeable calcium-ion batteries is identified. Remarkably, an unexpected stable structure of the material for Ca2+ storage is demonstrated. It is found that the interlayer spacing shows only a tiny variation of similar to 0.09 angstrom during Ca2+ insertion/extraction, which results in its outstanding cycling stability (capacity retention of 86.9% after 500 cycles) for Ca2+ storage. On the basis of in situ/ex situ experimental characterizations and ab initio simulation, the origin of such superior structural stability is revealed. This ultrastable cathode together with the understanding lays a strong foundation for developing high-performance calcium-ion batteries.
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