Ca_2Nb_2O_7 as a Novel Open-framework Anode Material for Potassium-ion Batteries |
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| Authors: | YANG Xin WANG Zheng-Dong FU Yu-Ru LIU Qin XIAO Gao |
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| Affiliation: | CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences,Fuzhou 350002,China;University of Chinese Academy of Sciences,Beijing100039,China;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences,Fuzhou 350002,China;Department of Environmental Science and Engineering,College of Environment and Resources,Fuzhou University,Fuzhou 350108,China;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences,Fuzhou 350002,China;Department of Environmental Science and Engineering,College of Environment and Resources,Fuzhou University,Fuzhou 350108,China;State Key Laboratory of Photocatalysis on Energy and Environment,Fuzhou University,Fuzhou 350116,China |
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| Abstract: | Potassium-ion batteries(KIBs) are a promising alternative to Lithium-based energy storage systems owning to the low cost and rich abundance of potassium resources, but are facing challenges in designing low-cost hosts that can reversibly accommodate large-size K+ with fast diffusion kinetics. Herein, we report a novel 3D inorganic open framework of Ca_2Nb_2O_7(CNO) as an anode for KIBs. The open framework structure affords interstitial vacancies available for storing K~+ and allows a facile diffusion of K~+, thus resulting in excellent structural stability and fast reaction kinetics. The CNO electrode delivers a reversible specific capacity of 65.3 and 52.2 mAh/g at 5 and 10 mA/g, respectively. Moreover, CNO exhibits excellent long-term cyclability with 92.53% capacity retention over 700 cycles at 10 mA/g. This will trigger more investigations into open-framework-based materials for stable and fast KIBs. |
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