AI Article Synopsis
- Room temperature sodium-sulfur (RT-Na/S) batteries are attractive for large-scale energy storage due to their cost-effectiveness and high energy density, but face challenges like shuttle effects and slow reaction rates.
- A new design utilizing FeSe nanoparticles on nitrogen-doped porous carbon nanosheets was developed to mitigate these issues by inhibiting the shuttle effect and improving the utilization of sulfur.
- This approach provides a fast electron and ion transport platform, enhances catalytic activity, and achieves impressive results with high sulfur availability and long cycle life, maintaining 72% capacity after 500 cycles.
Article Abstract
Room temperature sodium-sulfur (RT-Na/S) batteries are a promising candidate for large-scale energy storage systems owing to their low manufacturing cost and high energy density. However, the severe shuttle effects and sluggish reaction kinetics hinder their practical application. Here, a FeSe nanoparticle anchored three-dimensional nitrogen-doped porous carbon nanosheet was designed as a functional defender to inhibit the shuttle effect and achieve high sulfur utilization. The porous carbon nanosheet builds a fast platform for electron and ion transport and acts as a limiting barrier for polysulfide dissolution and shuttling. Additionally, FeSe nanoparticles are incorporated to enhance the chemical anchoring and catalytic activity of polysulfides. The ex-situ characterization revealed that the Fe sites can feed electrons to polysulfides, thus facilitating the conversion of long-chain polysulfides to NaS, resulting in high sulfur availability (323 mAh/g at 2 A/g) and long-term cycle life (72 % capacity retention at 1 A/g for 500 cycles).
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| http://dx.doi.org/10.1016/j.jcis.2024.08.173 | DOI Listing |
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