One-step synthesis of multilayered 2D Sn nanodendrites as a high-performance anode material for Na-ion batteries,Journal of Materials Chemistry A

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One-step synthesis of multilayered 2D Sn nanodendrites as a high-performance anode material for Na-ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-09-04 00:00:00 , DOI: 10.1039/c7ta06469a
Tae-Hee Kim _{1,

2,

3,

4} , Kyung-Sik Hong _{1,

2,

3,

4} , DongRak Sohn _{1,

2,

3,

4} , MinJoong Kim _{1,

2,

3,

4} , Do-Hwan Nam _{1,

2,

3,

4} , EunAe Cho _{1,

2,

3,

4,

5} , HyukSang Kwon _{1,

2,

3,

4}

Affiliation

Multilayered 2D Sn nanodendrites were synthesized by a one-step electrodeposition process from an aqueous solution containing coumarin (C₉H₆O₂). Under a high cathodic current density that is necessary for dendritic growth, hydrogen bubbles evolved with Sn reduction. The hydrogen bubbles limited the diffusion path of the Sn ions to space between hydrogen bubbles and concealed the splitting sites for additional branches, which suppressed the development of the branches. The addition of coumarin greatly reduced the departure diameter of the hydrogen bubbles and thus made the growth of the Sn dendrites with a high density of nanosized branches possible. Furthermore, coumarin suppressed Sn crystallite growth along the [001] direction, promoting two-dimensional growth of the 2D Sn nanodendrites along the set of [220] directions that are normal to the [001] direction. These 2D Sn nanodendrites grew layer-by-layer on a substrate, forming a unique multilayered structure. As an anode material for Na-ion batteries, the multilayered 2D Sn nanodendrites exhibited a high specific capacity of 783.88 mA h g⁻¹ and excellent cycle performance with 96.6% capacity retention over 300 cycles. Moreover, the multilayered 2D Sn nanodendrites showed a superior rate capability of 412.84 mA g⁻¹ at 5C. The outstanding performance is attributed to a high density of free space inside the multilayered 2D Sn nanodendrites and the nanosized Sn branches that offer short diffusion paths for Na ions.

中文翻译：

一步法合成多层2D Sn纳米枝晶作为Na离子电池的高性能负极材料

通过一步法电沉积工艺，从含有香豆素（C ₉ H ₆ O _2）的水溶液中合成了多层二维Sn纳米枝晶）。在树枝状生长所必需的高阴极电流密度下，氢气泡随着Sn的还原而析出。氢气泡将Sn离子的扩散路径限制在氢气泡之间的空间，并隐藏了额外分支的分裂位点，从而抑制了分支的发展。香豆素的加入大大减小了氢气泡的离去直径，因此使得具有高密度的纳米级分支的Sn树枝状晶体的生长成为可能。此外，香豆素抑制了锡晶体沿[001]方向的生长，从而促进了二维锡纳米枝晶沿垂直于[001]方向的[220]方向的二维生长。这些2D Sn纳米树枝晶在基板上逐层生长，形成独特的多层结构。^-1和出色的循环性能，在300个循环中保持96.6％的容量。此外，多层2D Sn纳米树枝晶在5C时显示出412.84 mA g^-1的优异倍率能力。出色的性能归因于多层2D Sn纳米树枝晶和纳米级Sn分支内的自由空间密度高，这些分支为Na离子提供了短扩散路径。

更新日期：2017-09-19

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