Defect-Engineered Bulk Conversion Anodes for Fast and Temperature-Adaptive Na⁺ Storage.

ABSTRACT: Conversion-based metal sulfides/selenides anodes are promising for sodium-ion batteries (SIBs) owing to their high capacities and good electronic conductivity. However, their large volumetric variation during cycling often leads to rapid capacity decay, hindering commercial applications. Meanwhile, developing a low-cost and efficient synthesis strategy to enhance sodium storage remains challenging. Herein, defect engineering is introduced in bulk Fe₇Se₈ (bulk-Fe₇Se_8-x) to fabricate a carbon-free and defect-rich anode. The optimized bulk-Fe₇Se_8-x realizes remarkable fast-charging performance and good temperature adaptability, achieving excellent cyclic stability (384 mAh g^-1 after 1300 cycles at 5 A g^-1

SUBMITTER: Zhou Y 

PROVIDER: S-EPMC12767120 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature