论文成果
Altered S-S Coulomb Interactions in Polysulfides Associated with VS<sub>2</sub>/S Nanocomposite Electrodes for Na-S Batteries
- 发布时间：2024-12-23
- 点击次数：
- 关键字：SODIUM-SULFUR BATTERIES; NANOSHEETS; ANODE
- 摘要：Despite the abundant reserves and high theoretical capacity of Na-S batteries, it is still limited by the sluggish reaction kinetics of polysulfides during ultrafast charging and discharging to provide stable and high sodium-ion storage performance. Herein, a catalytic strategy is proposed to change the direction of the Coulomb interaction of S-S bonds to achieve high rate reaction kinetics in polysulfides. In this strategy, a NaxVS2 structure is constructed in VS2/S nanocomposite electrodes to support S for superior performance (784 mA h/g at 0.1 A/g and 512 mA h/g at 10 A/g) during sodium storage process. The electrode can still exhibit stable cycling performance at a very high current density (5000 cycles at 20 A/g). The Na-inserted VS2 (NaxVS2) changes the charge distribution of S in polysulfide molecules, altering the Coulomb interaction between S atoms in polysulfide to form repulsion-induced breaking of S-S bond. This altering effect on the atomic Coulomb interaction is essential to promoting the conversion reaction of polysulfides. The above strategy of changing the Coulomb interaction between S atoms not only provides a reference for the design of nanostructures for electrochemical processes with multistep reactions but also inspires angles and ideas for realizing high-performance Na-S batteries.
- 卷号：7
- 期号：7
- 是否译文：否
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