Citation: Xin YANG, Zheng-Dong WANG, Yu-Ru FU, Qin LIU, Gao XIAO. Ca₂Nb₂O₇ as a Novel Open-framework Anode Material for Potassium-ion Batteries[J]. Chinese Journal of Structural Chemistry, ;2021, 40(2): 233-238. doi: 10.14102/j.cnki.0254-5861.2011-2862 shu

Ca₂Nb₂O₇ as a Novel Open-framework Anode Material for Potassium-ion Batteries

Xin YANG ^{a, b} ,
Zheng-Dong WANG ^{a, c} ,
Yu-Ru FU ^a ,
Qin LIU ^a,, ,
Gao XIAO ^{c, d,,}

a.
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
b.
University of Chinese Academy of Sciences, Beijing100039, China
c.
Department of Environmental Science and Engineering, College of Environment and Resources, Fuzhou University, Fuzhou 350108, China
d.
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, China

Corresponding author: Qin LIU, liuqin365@fjirsm.ac.cn Gao XIAO, xiaogao@fzu.edu.cn
Received Date: 27 April 2020
Accepted Date: 18 June 2020

Fund Project: the Natural Science Foundation of Fujian Province 2018J01031Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment SKLPEE-202013Natural Science Foundation of Fujian Province 2017J01412National Natural Science Foundation of China 21506036

Figures(4)

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 Ca₂Nb₂O₇ (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.
- potassium-ion batteries,
- inorganic-open-framework,
- long lifespan,
- kinetics
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Ca2Nb2O7 as a Novel Open-framework Anode Material for Potassium-ion Batteries

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Ca₂Nb₂O₇ as a Novel Open-framework Anode Material for Potassium-ion Batteries