The considerable interest in rechargeable batteries is causing a rapid increase in demand and a surge in the price of raw materials. Earth-abundant iron oxyhydroxide (FeOOH) is a promising candidate as an anode material for sodium-ion rechargeable batteries (SIBs). However, the application of FeOOH is hindered by numerous technical limitations arising mainly from the irreversibility of the conversion reaction. Here, we manipulate biotic Fe redox from FeOOH-acetate hybrid nanoplatelets (FAHPs) to make the resulting conversion reaction with Na ions highly reversible. The extended lepidocrocite-type FAHP, in which FeOOH and acetate components are stacked in a layer-by-layer assembly, undergoes facile initial intercalation owing to its large interlayer spacing. Consequently, the redox reaction coupled with FeOOH reduction and acetate oxidation occurs in a similar way to the biotic Fe redox reaction. During the subsequent discharge-charge cycles, carbonate produced by the redox coupling of acetate and FeOOH serves as a stable and reversible host for Na ion storage. This study establishes a novel method for enabling highly reversible conversion reactions and enhancing the electrochemical capacity using not only Na ions but Li ions through the exploitation of the interplaying redox of inorganic and organic materials in hybrid structures.
Bibliographical noteFunding Information:
YKK acknowledges funding from the National Research Foundation of Korea (NRF) under grant numbers 2019R1A2C3006587 and 2019R1I1A1A01062020. YMK acknowledges funding from the National Research Foundation of Korea (NRF) under grant numbers NRF-2022R1A2B5B03001781 and NRF-2020M3D1A1110527 as well as the KU-KIST School Program. JUC acknowledges funding from the National Research Foundation of Korea (NRF) funded by the Ministry of Education under grant number NRF-2020R1F1A107169013, and the Commercialization Promotion Agency for R&D Outcomes (COMPA) funded by the Ministry of Science and ICT (MSIT) under grant number 2021-RE-G03.
© 2022 The Royal Society of Chemistry.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)