期刊
ENERGY STORAGE MATERIALS
卷 34, 期 -, 页码 475-482出版社
ELSEVIER
DOI: 10.1016/j.ensm.2020.10.013
关键词
Potassium Niobate; Potassium ion capacitor; Waste derived carbon; Energy density
资金
- Science and Engineering Faculty, QUT
- QUT's start-up grant [323000-0424/07]
- Centre for Materials Science, QUT, Australia
- Indian Institute of Technology Jammu [SGT-100038]
- Science and Engineering Research Board (SERB) startup research grant [SRG/2020/000865]
Potassium-ion battery (KIB) is a promising technology for large-scale energy storage applications, but its development is hindered by slow K+ transport kinetics and structural instability of electrode materials. In this study, a potassium-ion capacitor (KIC) was designed using layered potassium niobate and activated carbon, achieving high performance through systematic electrochemical analysis and in-situ characterizations.
Potassium-ion battery (KIB) is a promising technology for large-scale energy storage applications due to their low cost, theoretically high energy density and abundant resources. However, the development of KIBs is hindered by the sluggish K+ transport kinetics and the structural instability of the electrode materials during K+ intercalation/de-intercalation. In the present investigation, we have designed a potassium-ion capacitor (KIC) using layered potassium niobate (K4Nb6O17, KNO) nanosheet arrays as anode and orange-peel derived activated carbons (OPAC) as fast capacitive cathode materials. The systematic electrochemical analysis with the ex-situ characterizations demonstrates that KNO-anode exhibits highly stable layered structure with excellent reversibility during K+ insertion/de-insertion. After optimization, the fabricated KNO//OPAC delivers both a high energy density of 116 Wh/kg and high power density of 10,808 W/kg, which is significantly higher than other similar hybrid devices. The cell also displays long term cycling stability over 5000 cycles, with 87 % of capacity retention. This study highlights the utilization of layered nanosheet arrays of niobates to achieve superior K-storage for KICs, paving the way towards the development of high-performance anodes for post lithium-ion batteries.Y
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