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Synergistic Effects of Co3Se4 and Ti2C3Tx for Performance Enhancement on Lithium–Sulfur Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-05-29 , DOI: 10.1021/acsami.3c04767
Xuejie Wang 1 , Bicheng Zhu 1 , Difa Xu 2 , Zicheng Gao 1 , Yu Yao 3 , Tao Liu 1 , Jiaguo Yu 1 , Liuyang Zhang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-05-29 , DOI: 10.1021/acsami.3c04767
Xuejie Wang 1 , Bicheng Zhu 1 , Difa Xu 2 , Zicheng Gao 1 , Yu Yao 3 , Tao Liu 1 , Jiaguo Yu 1 , Liuyang Zhang 1
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As electronic equipment develops rapidly, higher requirements are placed on electrochemical energy-storage devices. These requirements can be met by a lithium–sulfur (Li–S) battery since it has an impressive energy density of 2600 Wh kg–1 and a high theoretical specific capacity of 1675 mAh g–1. Pitifully, the sluggish redox reaction kinetics and the shuttle effect of polysulfide seriously limit its applications. Separator modification has been proven to be an effective strategy for improving the performance of Li–S batteries. Herein, we have designed a competent three-dimensional separator. It is obtained by embedding Co3Se4 nanoparticles on nitrogen-doped porous carbon (Co3Se4@N–C) by high-temperature selenization of ZIF-67, which are compounded with Ti3C2Tx by electrostatic dispersion self-assembly, and the compound is used to adjust the surface properties of a polypropylene (PP) separator. Due to the synergistic effect of the superior catalytic performance of Co3Se4@N–C and the enhancement of adsorption and conductivity bestowed by Ti3C2Tx, lithium–sulfur batteries perform excellently with the modified PP separator. Specifically, the battery with a Co3Se4@N–C/Ti3C2Tx-modified PP separator exhibits an outstanding rate performance of 787 mAh g–1 at 4C, and stable performance is maintained after 300 cycles at 2C. The density functional theory (DFT) calculations are also performed to confirm the synergistic effect of Co3Se4@N–C and Ti3C2Tx. This design integrates the merits of catalysis and adsorption and provides a new method for constructing high-performance lithium–sulfur batteries.
中文翻译:
Co3Se4 和 Ti2C3TX 对锂硫电池性能提升的协同效应
随着电子设备的快速发展,对电化学储能器件提出了更高的要求。锂硫 (Li-S) 电池可以满足这些要求,因为它具有令人印象深刻的 2600 Wh kg –1能量密度和 1675 mAh g –1的高理论比容量。遗憾的是,缓慢的氧化还原反应动力学和多硫化物的穿梭效应严重限制了其应用。隔膜改性已被证明是提高锂硫电池性能的有效策略。在这里,我们设计了一个称职的三维分离器。它是通过将Co 3 Se 4纳米粒子嵌入氮掺杂多孔碳(Co 3 Se 4@N–C)通过ZIF-67的高温硒化,通过静电分散自组装与Ti 3 C 2 T x复合,该复合物用于调节聚丙烯(PP)隔膜的表面性能。由于 Co 3 Se 4 @N–C 优异的催化性能与 Ti 3 C 2 T x赋予的吸附和导电性增强的协同效应,锂硫电池在改性 PP 隔膜上表现出色。具体来说,具有 Co 3 Se 4 @N–C/Ti 3 C 2 T x的电池-改性聚丙烯隔膜在 4C 下表现出 787 mAh g –1的出色倍率性能,并且在 2C 下循环 300 次后仍保持稳定的性能。还进行了密度泛函理论 (DFT) 计算以确认 Co 3 Se 4 @N–C 和 Ti 3 C 2 T x的协同效应。该设计综合了催化和吸附的优点,为构建高性能锂硫电池提供了一种新方法。
更新日期:2023-05-29
中文翻译:
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Co3Se4 和 Ti2C3TX 对锂硫电池性能提升的协同效应
随着电子设备的快速发展,对电化学储能器件提出了更高的要求。锂硫 (Li-S) 电池可以满足这些要求,因为它具有令人印象深刻的 2600 Wh kg –1能量密度和 1675 mAh g –1的高理论比容量。遗憾的是,缓慢的氧化还原反应动力学和多硫化物的穿梭效应严重限制了其应用。隔膜改性已被证明是提高锂硫电池性能的有效策略。在这里,我们设计了一个称职的三维分离器。它是通过将Co 3 Se 4纳米粒子嵌入氮掺杂多孔碳(Co 3 Se 4@N–C)通过ZIF-67的高温硒化,通过静电分散自组装与Ti 3 C 2 T x复合,该复合物用于调节聚丙烯(PP)隔膜的表面性能。由于 Co 3 Se 4 @N–C 优异的催化性能与 Ti 3 C 2 T x赋予的吸附和导电性增强的协同效应,锂硫电池在改性 PP 隔膜上表现出色。具体来说,具有 Co 3 Se 4 @N–C/Ti 3 C 2 T x的电池-改性聚丙烯隔膜在 4C 下表现出 787 mAh g –1的出色倍率性能,并且在 2C 下循环 300 次后仍保持稳定的性能。还进行了密度泛函理论 (DFT) 计算以确认 Co 3 Se 4 @N–C 和 Ti 3 C 2 T x的协同效应。该设计综合了催化和吸附的优点,为构建高性能锂硫电池提供了一种新方法。