Tuning the Composition and Structure of Bi–Sb Alloy@C Composites for Superior Potassium-Ion Storage

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

Potassium-ion batteries (PIBs) are considered promising alternatives or supplements to lithium-ion due the abundant reserve of potassium and its redox potential being close that lithium. Among candidate anode materials for PIBs, high-capacity alloy-type anodes such as Sb Bi usually confronted with critical challenge poor cycling stability caused by significant volume expansion. To address this issue, work designed synthesized a series BixSb1-x@C (BSC, 0 ≤ x 1) composite different Bi/Sb ratios microstructures, using metal-organic frameworks (MOFs) precursors. Owing fine particle size suitable composition Bi0.5Sb0.5 alloy promotes antipulverization property, favorable small-sized micronribbons carbon matrix effectively inhibits agglomeration buffers change, unique radially assembled structure facilitates stress relief enhances electron ion transport, preferred (BS23C) exhibits outstanding electrochemical performance K+ storage. It demonstrates long cycle life (capacity retention rate 94.1% after 1500 cycles at 2 A g-1) capability (275.2 mAh g-1 5.0 g-1). In situ XRD analysis reveals two-step phase evolution process Bi0.5Sb0.5: ↔ K(Bi0.5Sb0.5) K3(Bi0.5Sb0.5). The discharge end-state in first is hexagonal K3(Bi0.5Sb0.5), while it becomes cubic K3(Bi0.5Sb0.5) subsequent cycles. formation associated lower expansion rate, contributing enhanced stability. This study provides insightful guidance design high-performance PIBs.

Язык: Английский

Structural engineering of N/S co-doped hard carbon anodes for enhanced potassium storage performance

FlatChem, Год журнала: 2025, Номер unknown, С. 100889 - 100889

Опубликована: Май 1, 2025

Язык: Английский

Sulfur-bonded hard carbon with enhanced interfacial and bulk kinetics for potassium-ion hybrid capacitors

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 164446 - 164446

Опубликована: Июнь 1, 2025

Язык: Английский