Chemically sodiated iron disulfide as a high-capacity charge-storage host with cation- and anion-sited redox

Key Points

• The aim is to explore the charge-storage capabilities of sodiated iron disulfide for Na-ion batteries.
• Conducted low-temperature chemical synthesis of Na 2 FeS 2.
• Characterized redox properties at both cation and anion sites.
• Achieved high capacity exceeding 250 mAh g −1 for Na-ion storage.
• Demonstrated operational stability with effective cation- and anion-sited redox.