Abstract
Lithium-sulfur (Li-S) batteries have gained widespread attention owing to their high theoretical energy density and low cost. However, the commercial application of these batteries is hindered by the severe shuttle effect and slow redox reaction kinetics of polysulfides. In this study, a hierarchically porous membrane consisting of CoSe2 nanoparticle-decorated carbon nanofibers containing carbon nanotubes (CoSe2@CNF/CNT) is constructed as a self-supported sulfur host for Li-S batteries. The hierarchical conductive network of CNFs/CNTs with N-doped porous carbon facilitates electron/ion transport and provides sufficient space to mitigate the volume expansion of lithium polysulfides (LiPSs). Moreover, the modified CoSe2 nanoparticles serve as both chemical trappers and electrocatalysts, chemically anchoring LiPSs and accelerating the redox kinetics to inhibit the shuttle effect. As a result, an initial specific discharge capacity of 1098.8 mA h g−1 is achieved at 1 C. Importantly, the cathode exhibits superior cycling stability with a capacity decay rate as low as 0.06% over 500 cycles. This work offers a feasible approach to designing multi-functional sulfur hosts for high-energy-density Li-S batteries.
摘要
具有高理论容量和高能量密度的锂硫电池被认为是最具前景的储能器件, 但其实用化进程受到了多硫化物穿梭效应和氧化还原动力学缓慢等问题的影响. 本文将CoSe2纳米颗粒修饰的碳纳米纤维/碳纳米管(CoSe2@CNF/CNT)自支撑膜作为高性能锂硫电池硫宿主电极. 其中, 由氮掺杂多孔碳和CNF/CNT组成的导电碳网络能够促进电荷传输,并缓解硫在循环过程中的体积膨胀. CoSe2纳米颗粒兼具化学吸附位点和电催化剂的功能, 通过化学吸附锚定多硫化物并加速其氧化还原转换, 从而抑制穿梭效应和提高性能. 因此CoSe2@CNF/CNT-S电极具有优异的电化学性能, 1 C下能提供1098.8 mA h g−1的放电比容量, 循环500圈中每圈容量衰减率低至0.06%. 这项工作为高能量密度锂硫电池的开发提供了一种新方案.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (U22A20118), Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China (2021ZR146 and 2021ZZ122), and the Award Program for Fujian Minjiang Scholar Professorship. We would also like to thank Shuting Ren from Shiyanjia Lab (www.shiyanjia.com) for carrying out the XPS analyses.
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Wang X supervised the whole project. Ao J, Xie Y, and Wang X conceived the concept and initiated the project. Ao J and Xie Y designed and conducted the experiments and drafted the manuscript. All authors participated in the discussion of the results and revision of the manuscript.
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The authors declare that they have no conflict of interest.
Juan Ao received her BSc degree from Yanshan University in 2019. Now she is an MSc student at the College of Physics and Information Engineering, Fuzhou University. Her current research focuses on the design of novel sulfur cathode for high performance lithium-sulfur batteries.
Yonghui Xie is a PhD candidate at the School of Physics and Information Engineering, Fuzhou University, focusing on the design and performance control of electrode materials for high energy density lithium-sulfur batteries.
Xinghui Wang completed his PhD degree in condensed matter physics from Lanzhou University in 2013, and then worked as a research staff at Nanyang Technological University and Singapore-MIT Alliance for Research and Technology in sequence. He is currently a Minjiang Scholar Professor at the College of Physics and Information Engineering, Fuzhou University. His research interests involve the fabrication of nanomaterials and thin film electrodes for energy storage application, mainly including thin film microbatteries, planar supercapacitors, flexible energy storage devices, lithium metal anodes, and sulfur cathodes.
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CoSe2 Nanoparticles-decorated Carbon Nanofibers as A Hierarchical Self-supported Sulfur Host for high-energy lithium-sulfur batteries
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Ao, J., Xie, Y., Lai, Y. et al. CoSe2 nanoparticles-decorated carbon nanofibers as a hierarchical self-supported sulfur host for high-energy lithium-sulfur batteries. Sci. China Mater. 66, 3075–3083 (2023). https://doi.org/10.1007/s40843-022-2462-x
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DOI: https://doi.org/10.1007/s40843-022-2462-x