Yuxin Fan, Yongzheng Zhu, Zheng Wei, Huibing He and Jinliang Zhu
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Theoretical calculations revealed that the superior electrochemical performance of VN–V<small><sub>2</sub></small>O<small><sub>3</sub></small> nanoparticles arises from an interfacial electric field generated by charge redistribution at the VN/V<small><sub>2</sub></small>O<small><sub>3</sub></small> interface. This electric field facilitates electron transfer, accelerating the conversion of LiPSs. Li–S batteries equipped with VN–V<small><sub>2</sub></small>O<small><sub>3</sub></small>/C@S cathodes demonstrated an outstanding initial discharge capacity of 1191.96 mA h g<small><sup>−1</sup></small>, excellent rate performance (641.69 mA h g<small><sup>−1</sup></small> at 5C), and an extremely low capacity decay rate of 0.026% over 1000 cycles at 2C. Additionally, the assembled pouch cell achieved an initial energy density of 351.1 W h kg<small><sup>−1</sup></small>. This work offers new insights into the catalytic mechanisms of vanadium-based heterostructure catalysts in enhancing the redox kinetics of polysulfide conversion.</p>","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":" 18","pages":" 13020-13027"},"PeriodicalIF":9.5000,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Boosting catalytic activity by using the interfacial electric field of VN–V2O3 heterogeneous nanoparticles for efficient lithium polysulfide conversion†\",\"authors\":\"Yuxin Fan, Yongzheng Zhu, Zheng Wei, Huibing He and Jinliang Zhu\",\"doi\":\"10.1039/D5TA00139K\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >The capacity loss and reduced cycling performance caused by the shuttle effect of lithium polysulfides (LiPSs) present significant challenges for the practical application of lithium-sulfur (Li–S) batteries. 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引用次数: 0
摘要
多硫化锂(LiPSs)的穿梭效应导致的容量损失和循环性能下降,对锂硫电池的实际应用提出了重大挑战。在这项研究中,合成了新型的多孔碳骨架(VN-V2O3/C)上的VN-V2O3非均相纳米颗粒作为高效催化剂。通过综合实验表征,发现VN-V2O3/C具有中等多硫化物吸附能力和高电化学活性的平衡。理论计算表明,VN-V2O3纳米颗粒优异的电化学性能源于VN/V2O3界面电荷重分布产生的界面电场。这个电场促进电子转移,加速LiPSs的转化。配备VN-V2O3/C + s阴极的锂- s电池表现出出色的初始放电容量为1191.96 mAh g⁻¹,出色的倍率性能(5℃时为641.69 mAh g⁻¹),在2℃时1000次循环的极低容量衰减率为0.026%。此外,组装的袋状电池的初始能量密度为351.1 Wh kg⁻¹。这项工作为钒基异质结构催化剂在提高多硫化物转化氧化还原动力学方面的催化机理提供了新的见解。
Boosting catalytic activity by using the interfacial electric field of VN–V2O3 heterogeneous nanoparticles for efficient lithium polysulfide conversion†
The capacity loss and reduced cycling performance caused by the shuttle effect of lithium polysulfides (LiPSs) present significant challenges for the practical application of lithium-sulfur (Li–S) batteries. In this study, innovative VN–V2O3 heterogeneous nanoparticles supported on a porous carbon framework (VN–V2O3/C) were synthesized as efficient catalysts. Through comprehensive experimental characterization, VN–V2O3/C was found to exhibit a balance of moderate polysulfide adsorption capability and high electrochemical activity. Theoretical calculations revealed that the superior electrochemical performance of VN–V2O3 nanoparticles arises from an interfacial electric field generated by charge redistribution at the VN/V2O3 interface. This electric field facilitates electron transfer, accelerating the conversion of LiPSs. Li–S batteries equipped with VN–V2O3/C@S cathodes demonstrated an outstanding initial discharge capacity of 1191.96 mA h g−1, excellent rate performance (641.69 mA h g−1 at 5C), and an extremely low capacity decay rate of 0.026% over 1000 cycles at 2C. Additionally, the assembled pouch cell achieved an initial energy density of 351.1 W h kg−1. This work offers new insights into the catalytic mechanisms of vanadium-based heterostructure catalysts in enhancing the redox kinetics of polysulfide conversion.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.