S, Se-Codoped Dual Carbon Coating and Se Substitution in Co-Alkoxide-Derived CoS<sub>2</sub> Through SeS<sub>2</sub> Triggered Selenization for High-Performance Sodium-Ion Batteries
The development of metal sulfides as anodes for sodium-ion batteries (SIBs) is significantly obstructed by the slow kinetics of the electrochemical reactions and the substantial volume changes on the cycling. Herein, we introduce a selenium-substituted cobalt disulfide embedded within a dual carbon–...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Batteries |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2313-0105/11/1/28 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The development of metal sulfides as anodes for sodium-ion batteries (SIBs) is significantly obstructed by the slow kinetics of the electrochemical reactions and the substantial volume changes on the cycling. Herein, we introduce a selenium-substituted cobalt disulfide embedded within a dual carbon–graphene framework (Se-CoS<sub>2</sub>/C@rGO) for high-performance SIBs. The Se-CoS<sub>2</sub>/C@rGO was prepared via a synchronous sulfurization/selenization strategy using Co-alkoxide as the precursor and SeS<sub>2</sub> as the source of selenium and sulfur, during which the EG anions are converted in situ to a S, Se codoped carbon scaffold. The dual carbon–graphene matrix not only improves the electronic conductivity but also stabilizes the electrode material effectively. In addition, the Se substitution within the CoS<sub>2</sub> lattice further improves the electrical conductivity and promotes the Na<sup>+</sup> reaction kinetics. The enhanced intrinsic electronic/ionic conductivity and reinforced structural stability endow the Se-CoS<sub>2</sub>/C@rGO anode with a high reversible capacity (558.2 mAh g<sup>−1</sup> at 0.2 A g<sup>−1</sup>), superior rate performance (351 mAh g<sup>−1</sup> at 20 A g<sup>−1</sup>), and long cycle life (93.5% capacity retention after 2100 cycles at 1 A g<sup>−1</sup>). This work provides new insights into the development of stable and reversible anode materials through Se substitution and dual carbon encapsulation. |
|---|---|
| ISSN: | 2313-0105 |