Tightly confined tellurium nanocrystals in few-layer expanded graphite with Te–C bonds toward highly reversible zinc storage

IF 3.5 2区 物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-07-08 DOI:10.1063/5.0209116
Hengyu Yang, Yongle Liang, Fengjun Niu, Huaijun Zhang, Guobao Xu, Xiaolin Wei, Liwen Yang
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Abstract

Tellurium (Te) has great potential as high-performance cathode materials for aqueous zinc-ion batteries (AZIBs) owing to high electronic conductivity and volumetric capacity. Nevertheless, its poor utilization and large volume expansion result in insufficient rate and cycle performances, thereby, impeding practical application. Herein, a kind of Te/carbon composite was prepared via a ball-milling method, in which Te nanocrystals were tightly confined in few-layer expanded graphite (EG) with Te–C bonds (denoted as Te@EG). In addition to maintaining structural stability, such unique nanocomposite shows abundant electrochemically active sites and efficient charge transfer channels, which is beneficial to the utilization of Te. More importantly, the Te–C bonds between Te nanocrystals and EG can enhance the adsorption of Zn2+ and reduce the Zn2+ migration barrier, which contributes to promoting electrochemical kinetics. Consequently, the Te@EG cathode for the AZIBs exhibits sufficient specific capacity (412 mAh g–1 at 0.1 A g–1), high-rate performance (284 mAh g–1 at 3 A g–1), and reliable cycling stability (94% capacity retention at 1 A g–1 after 500 cycles). Furthermore, the soft-packaged Zn//Te@EG battery delivers excellent flexibility and cycling stability. This study offers a perspective on rational design of Te-based cathodes for practical AZIBs.
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具有 Te-C 键的几层膨胀石墨中紧密致密的碲纳米晶体实现高度可逆的锌存储
碲(Te)具有很高的电子传导性和体积容量,因此作为水性锌离子电池(AZIB)的高性能阴极材料具有很大的潜力。然而,由于其利用率低、体积膨胀大,导致其速率和循环性能不足,从而阻碍了其实际应用。本文通过球磨法制备了一种碲/碳复合材料,将碲纳米晶体紧密地限制在具有碲-碳键的几层膨胀石墨(EG)中(称为 Te@EG)。这种独特的纳米复合材料除了保持结构稳定外,还具有丰富的电化学活性位点和高效的电荷转移通道,有利于碲的利用。更重要的是,Te 纳米晶体与 EG 之间的 Te-C 键能增强对 Zn2+ 的吸附,降低 Zn2+ 迁移障碍,从而促进电化学动力学。因此,用于 AZIBs 的 Te@EG 阴极表现出足够的比容量(0.1 A g-1 时为 412 mAh g-1)、高倍率性能(3 A g-1 时为 284 mAh g-1)和可靠的循环稳定性(1 A g-1 循环 500 次后容量保持率为 94%)。此外,软包装 Zn/Te@EG 电池还具有出色的灵活性和循环稳定性。这项研究为合理设计实用 AZIB 的 Te 基阴极提供了一个视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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