增强MXene/CNT复合材料的物理和化学结合以及Ni催化转化以提高Li-S电池的性能

IF 3.6 2区 物理与天体物理 Q2 PHYSICS, APPLIED
Jia Li, Yaoying Li, Shengfengrui Zhang, Jiawei Xie, Yaoxuan Huang, Zhiping Wu, Peilin Qing, Guangxu Li, Dan Huang, Wenzheng Zhou
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引用次数: 0

摘要

制备了一种独特的三维多孔MXene/CNTs-Ni复合材料作为锂硫电池正极的主体材料。将一维碳纳米管(CNTs)与二维MXene纳米片穿插在一起,形成多孔网络结构,实现快速电荷转移和高效活性位点暴露。同时,引入具有催化活性的零维氧化镍可以催化产生更多的活性位点,从而进一步抑制穿梭效应,提高氧化还原动力学。MXene/CNTs-Ni基质具有独特的点-线-片互连形状的三维多孔结构,不仅提高了硫负载,减缓了阴极的体积膨胀,而且通过物理约束和化学吸附的协同作用,有效抑制了锂多硫化物的穿梭效应。在复合材料中,以S@MXene/CNT-1Ni为阴极的电池在0.5 C时的初始放电比容量为1078.2 mAh g−1,循环1000次后的容量为470.8 mAh g−1。每循环的容量衰减低至0.056%。即使硫负载为4.0 mg cm−2,电流为2.0 C, S@MXene/CNT-1Ni复合材料也能提供808.2 mAh g−1的高首循环比容量,300次循环后容量为370.6 mAh g−1,每循环容量衰减0.18%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced physical and chemical binding of MXene/CNT composite and Ni catalytic conversion to boost the performance of Li–S battery
A unique three-dimensional (3D) porous MXene/CNTs-Ni composite was fabricated as host material for the cathode of lithium–sulfur battery. One-dimensional carbon nanotubes (CNTs) were interspersed with two-dimensional MXene nanosheets to establish a porous network structure for fast charge transfer and efficient active site exposure. Meanwhile, the introduction of catalytically active zero-dimensional nickel oxide can catalyze the creation of more active sites, which can further inhibit the shuttle effect and enhance the redox kinetics. The hosts of MXene/CNTs-Ni with a unique 3D porous structure of point-line-sheet interconnection shape not only improve the sulfur loading and slow down the volume expansion of cathodes but also effectively inhibit the shuttle effect of lithium polysulfides through the synergistic effect of physical confinement and chemical adsorption. Among the composites, the cell with S@MXene/CNT-1Ni as a cathode had an initial discharge specific capacity of 1078.2 mAh g−1 at 0.5 C and a capacity of 470.8 mAh g−1 after 1000 cycles. The capacity decay was as low as 0.056% per cycle. Even with a sulfur loading of 4.0 mg cm−2 and a current of 2.0 C, the S@MXene/CNT-1Ni composite provides a high first-cycle specific capacity of 808.2 mAh g−1 and a capacity of 370.6 mAh g−1 after 300 cycles, with a capacity decay of 0.18% per cycle.
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来源期刊
Applied Physics Letters
Applied Physics Letters 物理-物理:应用
CiteScore
6.40
自引率
10.00%
发文量
1821
审稿时长
1.6 months
期刊介绍: Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.
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