Iron Selenide Microcapsules as Universal Conversion‐Typed Anodes for Alkali Metal‐Ion Batteries
Open Access
- 31 January 2021
- Vol. 17 (8), e2005745
- https://doi.org/10.1002/smll.202005745
Abstract
Rechargeable alkali metal-ion batteries (AMIBs) are receiving significant attention owing to their high energy density and low weight. The performance of AMIBs is highly dependent on the electrode materials. It is, therefore, quite crucial to explore suitable electrode materials that can fulfil the future requirements of AMIBs. Herein, a hierarchical hybrid yolk-shell structure of carbon-coated iron selenide microcapsules (FeSe2@C-3 MCs) is prepared via facile hydrothermal reaction, carbon-coating, HCl solution etching, and then selenization treatment. When used as the conversion-typed anode materials (CTAMs) for AMIBs, the yolk-shell FeSe2@C-3 MCs show advantages. First, the interconnected external carbon shell improves the mechanical strength of electrodes and accelerates ionic migration and electron transmission. Second, the internal electroactive FeSe2 nanoparticles effectively decrease the extent of volume expansion and avoid pulverization when compared with micro-sized solid FeSe2. Third, the yolk-shell structure provides sufficient inner void to ensure electrolyte infiltration and mobilize the surface and near-surface reactions of electroactive FeSe2 with alkali metal ions. Consequently, the designed yolk-shell FeSe2@C-3 MCs demonstrate enhanced electrochemical performance in lithium-ion batteries, sodium-ion batteries, and potassium-ion batteries with high specific capacities, long cyclic stability, and outstanding rate capability, presenting potential application as universal anodes for AMIBs.Funding Information
- National Natural Science Foundation of China (51773165, 51973171)
- Natural Science Foundation of Shaanxi Province (2019JM‐175)
This publication has 66 references indexed in Scilit:
- Promises and challenges of nanomaterials for lithium-based rechargeable batteriesNature Energy, 2016
- Nanooctahedra Particles Assembled FeSe2Microspheres Embedded into Sulfur-Doped Reduced Graphene Oxide Sheets As a Promising Anode for Sodium Ion BatteriesACS Applied Materials & Interfaces, 2016
- Promise and reality of post-lithium-ion batteries with high energy densitiesNature Reviews Materials, 2016
- Growth of conformal graphene cages on micrometre-sized silicon particles as stable battery anodesNature Energy, 2016
- Efficient organic solar cells processed from hydrocarbon solventsNature Energy, 2016
- High-capacity battery cathode prelithiation to offset initial lithium lossNature Energy, 2016
- Physical Interpretation of Cyclic Voltammetry for Hybrid PseudocapacitorsThe Journal of Physical Chemistry C, 2015
- FeSe2 Microspheres as a High‐Performance Anode Material for Na‐Ion BatteriesAdvanced Materials, 2015
- Soluble polysulphide sorption using carbon nanotube forest for enhancing cycle performance in a lithium–sulphur batteryNano Energy, 2014
- XPS study of some selected selenium compoundsJournal of Electron Spectroscopy and Related Phenomena, 1986