AI Article Synopsis
- Room-temperature sodium-sulfur batteries (RT-Na/S batteries) utilize abundant sodium, boasting high capacity (1675 mA h g) and energy density (1274 W h kg), making them a focus of recent research.
- The main issue faced by these batteries is the "shuttle effect," where sodium polysulfides (NaPSs) dissolve in the electrolyte, leading to rapid capacity loss during charge-discharge cycles.
- Recent strategies to mitigate this effect include using carbon-based materials to physically trap NaPSs, polar materials to absorb them and reduce dissolution, and catalytic materials to speed up their conversion to stable products, along with an exploration of the associated challenges.
Article Abstract
Room-temperature sodium-sulfur batteries (RT-Na/S batteries) with high reversible capacity (1675 mA h g) and excellent energy density (1274 W h kg) based on abundant resources of the metal Na have become a research hotspot recently. However, the intermediate product sodium polysulfides (NaPSs) generated during the charge-discharge process are easily dissolved in the ether electrolyte and transferred from the sulfur cathode to the metallic sodium surface, resulting in rapid capacity decay (shuttle effect), which seriously affects the practical application of RT-Na/S batteries. Herein, the mechanism and recent research progress in suppressing the shuttle effect of the sulfur cathode in RT-Na/S batteries are summarized. Strategies such as carbon-based materials physically fixing NaPSs, polar materials absorbing NaPSs to reduce their dissolution, and catalytic materials accelerating the transformation of NaPSs into final products are provided. Challenges and insights into high-performance sulfur electrodes for optimizing RT-Na/S batteries are discussed.
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