首页|Coupling Sb2WO6 microflowers and conductive polypyrrole for efficient potassium storage by enhanced conductivity and K+diffusivity
Coupling Sb2WO6 microflowers and conductive polypyrrole for efficient potassium storage by enhanced conductivity and K+diffusivity
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Although metal oxide compounds are considered as desirable anode materials for potassium-ion batter-ies(PIBs)due to their high theoretical capacity,the large volume variation remains a key issue in realizing metal oxide anodes with long cycle life and excellent rate property.In this study,polypyrrole-encapsulated Sb2WO6(denoted Sb2WO6@PPy)microflowers are synthesized by a one-step hydrothermal method followed by in-situ polymerization and coating by pyrrole.Leveraging the nanosheet-stacked Sb2WO6 microflower structure,the improved electronic conductivity,and the architectural protection offered by the PPy coating,Sb2WO6@PPy exhibits boosted potassium storage properties,thereby demon-strating an outstanding rate property of 110.3 mA h g-1 at 5 A g-1 and delivering a long-period cycling stability with a reversible capacity of 197.2 mA h g-1 after 500 cycles at 1 A g-1.In addition,the conver-sion and alloying processes of Sb2WO6@PPy in PIBs with the generation of intermediates,K2WO4 and K3Sb,is determined by X-ray photoelectron spectroscopy,transmission electron microscopy,and ex-situ X-ray diffraction during potassiation/depotassiation.Density functional theory calculations demon-strate that the robust coupling between PPy and Sb2WO6 endues it with a much stronger total density of states and a built-in electric field,thereby increasing the electronic conductivity,and thus effectively reduces the K*diffusion barrier.
Sb2WO6Polypyrrole coatingAnodePotassium-ion batteryIn-situ TEM observation
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