Large interspaced layered potassium niobate nanosheet arrays as an ultrastable anode for potassium ion capacitorShow others and affiliations
2021 (English)In: Energy Storage Materials, ISSN 2405-8289, E-ISSN 2405-8297, Vol. 34, p. 475-482Article in journal (Refereed) Published
Abstract [en]
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. © 2020
Place, publisher, year, edition, pages
Elsevier B.V. , 2021. Vol. 34, p. 475-482
Keywords [en]
Energy density, Potassium ion capacitor, Potassium Niobate, Waste derived carbon, Cathodes, Energy storage, Ions, Lithium-ion batteries, Nanosheets, Niobium compounds, Potassium, Abundant resources, Capacity retention, Electrochemical analysis, Energy storage applications, High energy densities, High power density, High-performance anodes, Structural instability, Anodes
Identifiers
URN: urn:nbn:se:miun:diva-43445DOI: 10.1016/j.ensm.2020.10.013ISI: 000599502600006Scopus ID: 2-s2.0-85093112381OAI: oai:DiVA.org:miun-43445DiVA, id: diva2:1604035
2021-10-182021-10-182021-10-18Bibliographically approved