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Electron-delocalization catalyzers for high performance, low-temperature Li-S batteries
Jing Zhang1, Lin Li1, Mannan Yang1
1School of Materials Science and Engineering & Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, China. tianna@xaut.edu.cn.
Chemical Communications (Cambridge, England)
|November 5, 2024
Summary
Low-temperature lithium-sulfur batteries face slow conversion kinetics. Introducing oxygen defects on vanadium trioxide (ODVO@PCN) enhances Li+ diffusion and redox reactions, improving battery performance at low temperatures.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Low-temperature lithium-sulfur batteries (LT-LSB) suffer from poor polysulfide conversion kinetics due to sluggish Li+ diffusion.
- Efficient charge transfer and ion transport are critical for LT-LSB performance.
Purpose of the Study:
- To develop a novel nanocatalyst for enhancing the kinetics of low-temperature lithium-sulfur batteries.
- To investigate the effect of oxygen defects and electron delocalization on catalyst performance.
Main Methods:
- Synthesized vanadium trioxide (V2O3) anchored on a porous carbon network with introduced oxygen defects (ODVO@PCN).
- Utilized electron delocalization strategy to create reconstructed V2+ active sites.
- Investigated the interaction between V2+ sites and sulfur species for enhanced Li+ transformation.
Main Results:
- The ODVO@PCN catalyst demonstrated enhanced Li+ transformation kinetics at the electrolyte/electrode interface.
- At 0 °C, the battery with ODVO@PCN achieved 501 mA h g-1 at 1C and 400 cycles at 0.5C.
- At -10 °C, the battery maintained 706 mA h g-1 with 85% capacity retention after 100 cycles.
Conclusions:
- Oxygen-deficient V2O3 on porous carbon (ODVO@PCN) effectively promotes fast redox reactions in LT-LSB.
- The enhanced interaction between V2+ sites and sulfur species improves low-temperature performance.
- ODVO@PCN shows significant potential as a kinetic promoter for advanced lithium-sulfur batteries.
