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Two-Dimensional Tin Disulfide Nanosheets for Enhanced Sodium Storage
Wenping Sun1,2, Xianhong Rui1, Dan Yang1
1School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore.
ACS Nano
|October 22, 2015
Summary
Ultrathin tin disulfide (SnS2) nanosheets offer enhanced sodium storage for grid applications. These 2D materials provide high capacity, excellent rate capability, and improved cycling stability for sodium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries for grid storage due to sodium's abundance.
- Current SIB anodes suffer from low capacity, poor rate performance, and inadequate cycling stability, limiting practical use.
Purpose of the Study:
- To synthesize ultrathin two-dimensional (2D) tin disulfide (SnS2) nanosheets for improved sodium storage.
- To investigate the electrochemical performance and sodium storage mechanism of SnS2 nanosheets.
Main Methods:
- Facile refluxing process for synthesizing ultrathin (3-4 nm) SnS2 nanosheets.
- Electrochemical testing in half-cells and full cells (with Na3V2(PO4)3 cathode).
- Ex situ X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM) for mechanism investigation.
Main Results:
- SnS2 nanosheets demonstrated high reversible capacity (733 mAh g(-1) at 0.1 A g(-1), 435 mAh g(-1) at 2 A g(-1)).
- Excellent cycling stability with 647 mAh g(-1) retention after 50 cycles at 0.1 A g(-1).
- Fast sodiation/desodiation kinetics and high apparent diffusion coefficient of Na(+).
Conclusions:
- The nanosheet morphology significantly enhances the rate capability and cycling stability of SnS2 anodes for SIBs.
- SnS2 nanosheets show great potential as high-performance anodes for grid-scale energy storage.
- The study elucidates the sodium storage mechanism in SnS2 nanosheets.
