Stibnite in carbon sheets stores sodium better
Natural Sb2S3 anchored on sulfur-doped carbon sheets delivers much higher reversible sodium-storage capacity and cycle retention than raw stibnite.
Source
Natural stibnite ore (Sb<sub>2</sub>S<sub>3</sub>) embedded in sulfur-doped carbon sheets: enhanced electrochemical properties as anode for sodium ions storage
Study at a glance
- Design
- Other — Natural Sb2S3 on sulfur-doped carbon sheets tested as a sodium-ion anode
- N
- Battery materials half-cell study — no sample N
- Population
- Sb2S3/SCS composite electrodes in Na-ion half-cells
- Outcome
- Reversible capacity and cycling retention versus raw stibnite
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
The authors made sulfur-doped carbon sheets by annealing an acetaldehyde/NaOH precursor with SDS at 800 °C, then precipitated natural stibnite onto the sheets from Na2S/H2SO4 and annealed at 300 °C. They characterized the composite by XRD, Raman, and XPS and tested it as a sodium-ion anode in 0.01–2.5 V half-cells.
What they found
Sb2S3/SCS kept 455.8 mA h g−1 after 100 cycles at 0.1 A g−1 (70.8% retention), versus 190.1 mA h g−1 and 30.7% retention for raw stibnite. Theoretical Sb2S3 capacity is 946 mA h g−1 via conversion plus alloying (12 Na per formula). Carbon buffering is meant to ease the ~390% volume swing of sodiation.
The limits
What it doesn't show
Results are half-cell versus sodium metal, not a full SIB pack. Rate numbers beyond the quoted cycling comparison are limited in the summary claims, and long-term calendar aging or scale-up of ore purity is not proven.
Key terms
- Sodium-ion battery
- Rechargeable cell that shuttles Na+ between electrodes, analogous to lithium-ion chemistry.
- Stibnite
- Natural orthorhombic Sb2S3 ore used here as the active anode feedstock.
- Conversion/alloying anode
- Sb2S3 first converts to Sb + Na2S, then Sb alloys to Na3Sb, storing many Na per formula unit.
- Sulfur-doped carbon sheets
- Conductive, flexible carbon support intended to buffer volume change and improve electron transport.
- Capacity retention
- Fraction of reversible capacity remaining after a stated number of charge/discharge cycles.
Flashcards
Research intelligence for this paper
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Quiz yourself
Sb2S3 stores sodium mainly by:
Common questions
Why wrap stibnite in carbon sheets?
To cushion the large volume change of sodiation and keep electronic contact so capacity does not collapse.
How many sodium ions can one Sb2S3 theoretically take?
Twelve Na+ (and 12 e−) per formula unit, giving 946 mA h g−1.
What capacity remained after 100 cycles?
455.8 mA h g−1 for Sb2S3/SCS versus 190.1 mA h g−1 for raw ore.
Is this a lithium cell?
No—sodium metal half-cells between 0.01 and 2.5 V.
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