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Enabling high-performance potassium storage by spatial confinement and interfacial bonding in bismuth-based anodes
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DOI：10.1007/s42823-026-01124-4.png)
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Abstract
En 中文
Bi-based compounds are increasingly recognized as potential anodes materials for potassium-ion batteries (PIBs), because of their exceptional theoretical capacity and appropriate operating potential characteristics. In this work, we introduced Bi@N-doped carbon composite comprising nanoscale Bi particles encapsulated within a nitrogen-doped carbon (Bi@NC) matrix framework. This distinctive configuration is attained through an in-situ carbonthermal reduction strategy. The N-doped carbon layer restricted Bi particle, the restricted domain microenvironment not only inhibits possible agglomeration and oxidation problems at the active site, but also makes intermediates, reactants and products more easily transferable within the restricted domain space. Consequently, the structure of Bi@NC facilitates rapid potassium storage, achieving a remarkable 253.3 mAh g− 1 capacity at 1 A g− 1, along with consistent cycling stability, retaining 170.3 mAh g− 1 capacity at 10 A g− 1 following 500 cycles. Importantly, a full cell featuring a potassium vanadate (Ca-KVO) cathode shows substantial promise for real-world applications. An extensive range of ex-situ methods are utilized to clarify the intricate potassium storage processes and kinetic characteristics. This research offers valuable perspectives for advanced PIBs.
Keywords:
Nitrogen doped
Bi nanoparticles
Space-confined
Potassium ion batteries
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