Abstract A template free, single-step process is developed for fabrication two-dimensional tin nano-platelets by electrochemical deposition in the presence of Triton X100 (TX100). Electrochemical studies combined with structural characterization revealed that during electrodeposition, TX100 molecules adsorb preferentially on {022} planes of Sn and highly anisotropic growth promotes in [200] direction which results in the formation of platelet morphology. The deposited platelets exhibit a high aspect ratio of 30 (width to thickness) and thickness of 25 ± 5 nm that uniformly covered the substrate with a high platelet density of 9 × 108 cm−2. The electrochemical performance of nano-platelets for lithium storage was studied in detail and compared with other morphologies of tin. Tin nano-platelets exhibited high reversible capacity and excellent cycling performance, the capacity was maintained at 820 mA h g−1 for 100 cycles and more, far superior to the other structures. Excellent rate capability was also observed for nano-platelets up to 5 C, with the ability to be operated at 20 C without damage. The superior electrochemical performance of tin platelets is mainly attributed to its two-dimensional structure that efficiently distributes strain, allowing high mechanical stability even after 100 cycles, as confirmed by Scanning Electron Microscopy (SEM).

中文翻译：

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二维锡纳米片作为锂离子电池高性能负极材料的电化学生长

摘要 开发了一种无模板的单步工艺，用于在 Triton X100 (TX100) 存在下通过电化学沉积制备二维锡纳米片。结合结构表征的电化学研究表明，在电沉积过程中，TX100 分子优先吸附在 Sn 的 {022} 平面上，并且在 [200] 方向上促进了高度各向异性的生长，从而导致形成片状形态。沉积的小片具有 30 的高纵横比（宽度与厚度）和 25 ± 5 nm 的厚度，以 9 × 108 cm-2 的高小片密度均匀覆盖基板。详细研究了用于锂存储的纳米片的电化学性能，并与锡的其他形态进行了比较。锡纳米片表现出高可逆容量和优异的循环性能，容量保持在 820 mA h g-1 100 次以上，远优于其他结构。对于高达 5 C 的纳米血小板，也观察到了出色的倍率性能，并且能够在 20 C 下操作而不会损坏。正如扫描电子显微镜 (SEM) 所证实的那样，锡片优异的电化学性能主要归功于其二维结构，可有效分布应变，即使在 100 次循环后仍具有高机械稳定性。