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Black phosphorous nanosheets@CNTs hybrid composite for boosting conversion of polysulfides in lithium sulfur batteries
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.electacta.2025.145762
Yaqi Chen, Chao Ma, Zhibiao Li, Tianjie Zhang, Chun Li, Junqiang Niu, Shanshan Yao
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.electacta.2025.145762
Yaqi Chen, Chao Ma, Zhibiao Li, Tianjie Zhang, Chun Li, Junqiang Niu, Shanshan Yao
Lithium sulfur batteries offer high specific energy at low cost but are hindered by the shuttle effect, which reduces capacity and cycled life due to sluggish sulfur redox kinetics. The efficient limitation of the shuttle effect of polysulfides from rational construction of electrocatalysts to accelerate the redox kinetics of polysulfides is extremely important. In this study, black phosphorous (BP) nanosheets derived commercial red phosphorous by solvothermal treatment, and modified carbon nanotubes (CNTs) hybrid materials are coated on a pristine polypropylene separator for capturing and boosting the conversion of polysulfides in lithium sulfur batteries. The one-dimensional CNTs not only promote the lithium-ions and electron pathways in redox kinetics, and two-dimensional BP nanosheets ensure the full exposure of active sites and accelerate polysulfides redox kinetics through chemisorption and catalytic conversion. Considering of these advantages mentioned above, when applied as the lithium sulfur batteries separator modifier, the cell assembled from the BP@CNTs modified separator with 4.2 mg cm−2 sulfur loading demonstrate high specific capacity (946.1 mAh g−1 at 0.3 C), and excellent cycling performance, which can maintain the capacity of 804.1 mAh g−1 after 300 cycles with low-capacity decay rate of 0.05 % per cycle. Even under a high sulfur loading of 8.9 mg cm−2, the cell can still present excellent cycling stability. This study paves the design black phosphorous modified carbonaceous materials hybrid for the construction outstanding functional separator layer and feasible synergistic approach for the inhibition of shuttle effect in lithium sulfur batteries.
中文翻译:
黑磷nanosheets@CNTs杂化复合材料,用于促进锂硫电池中多硫化物的转化率
锂硫电池以低成本提供高比能量,但受到穿梭效应的阻碍,由于硫氧化还原动力学缓慢,穿梭效应会降低容量和循环寿命。通过合理构建电催化剂来加速多硫化物的氧化还原动力学,有效限制多硫化物的穿梭效应极为重要。在这项研究中,通过溶剂热处理获得商业红磷的黑磷 (BP) 纳米片和改性碳纳米管 (CNT) 杂化材料被涂覆在原始聚丙烯隔膜上,用于捕获和促进锂硫电池中多硫化物的转化。一维 CNTs 不仅促进氧化还原动力学中的锂离子和电子途径,二维 BP 纳米片确保活性位点的充分暴露,并通过化学吸附和催化转化加速多硫化物氧化还原动力学。考虑到上述优点,当用作锂硫电池隔膜改性剂时,由含硫量为 4.2 mg cm −2 的BP@CNTs改性隔膜组装而成的电池表现出高比容量(0.3 C 时为 946.1 mAh g −1 )和优异的循环性能,循环 300 次后仍能保持 804.1 mAh g −1 的容量,每次循环的低容量衰减率为 0.05 %。即使在 8.9 mg cm −2 的高硫负载量下,该电池仍能表现出优异的循环稳定性。本研究为设计黑磷改性碳质材料杂化物铺平了道路,用于构建卓越的功能隔板层和抑制锂硫电池穿梭效应的可行协同方法。
更新日期:2025-01-28
中文翻译:
黑磷nanosheets@CNTs杂化复合材料,用于促进锂硫电池中多硫化物的转化率
锂硫电池以低成本提供高比能量,但受到穿梭效应的阻碍,由于硫氧化还原动力学缓慢,穿梭效应会降低容量和循环寿命。通过合理构建电催化剂来加速多硫化物的氧化还原动力学,有效限制多硫化物的穿梭效应极为重要。在这项研究中,通过溶剂热处理获得商业红磷的黑磷 (BP) 纳米片和改性碳纳米管 (CNT) 杂化材料被涂覆在原始聚丙烯隔膜上,用于捕获和促进锂硫电池中多硫化物的转化。一维 CNTs 不仅促进氧化还原动力学中的锂离子和电子途径,二维 BP 纳米片确保活性位点的充分暴露,并通过化学吸附和催化转化加速多硫化物氧化还原动力学。考虑到上述优点,当用作锂硫电池隔膜改性剂时,由含硫量为 4.2 mg cm −2 的BP@CNTs改性隔膜组装而成的电池表现出高比容量(0.3 C 时为 946.1 mAh g −1 )和优异的循环性能,循环 300 次后仍能保持 804.1 mAh g −1 的容量,每次循环的低容量衰减率为 0.05 %。即使在 8.9 mg cm −2 的高硫负载量下,该电池仍能表现出优异的循环稳定性。本研究为设计黑磷改性碳质材料杂化物铺平了道路,用于构建卓越的功能隔板层和抑制锂硫电池穿梭效应的可行协同方法。