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SnS2 Nanowall Arrays toward High-Performance Sodium Storage.
Peng Zhou1, Xiao Wang1, Wenhao Guan1
1State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province and School of Materials Science and Engineering, Zhejiang University , Hangzhou, Zhejiang 310027, PR China.
ACS Applied Materials & Interfaces
|January 20, 2017
Summary
Tin disulfide nanowalls offer a promising solution for sodium ion batteries (SIBs). This binder-free anode material demonstrates high capacity and stability, advancing energy storage technology.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium ion batteries (SIBs) are a cost-effective alternative to lithium-ion batteries for large-scale energy storage.
- Tin disulfide (SnS2) shows potential as an SIB anode material due to its layered structure and high theoretical capacity.
- Challenges for SnS2 anodes include slow ion diffusion kinetics and volume changes during cycling.
Purpose of the Study:
- To develop a novel SnS2 anode structure for enhanced sodium storage performance.
- To investigate the electrochemical properties of SnS2 nanowall arrays (NWA) for SIB applications.
- To address the limitations of traditional SnS2 anodes in SIBs.
Main Methods:
- Fabrication of SnS2 nanowall array (NWA) structure using one-step pulsed spray evaporation chemical vapor deposition (PSE-CVD).
- Direct use of SnS2 NWA as binder-free and carbon-free anodes for SIBs.
- Electrochemical testing, including capacity measurements at various current densities and cycling stability analysis.
Main Results:
- The SnS2 NWA electrode achieved a high reversible capacity of 576 mAh/g at 500 mA/g.
- Excellent rate capability was observed, with approximately 370 mAh/g at 5 A/g (64.2% retention at 500 mA/g).
- Enhanced cycling stability was demonstrated for the binder-free SnS2 NWA anode.
Conclusions:
- The unique SnS2 NWA structure effectively overcomes the kinetic and volume change limitations of SnS2 anodes.
- The rational electrode design facilitates rapid electron and sodium-ion transport, ensuring structural integrity during cycling.
- SnS2 NWA presents a promising, high-performance anode material for advanced sodium ion batteries.
