A three-dimensional hierarchical structure of cyclized-PAN/Si/Ni for mechanically stable silicon anodes,Journal of Materials Chemistry A

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A three-dimensional hierarchical structure of cyclized-PAN/Si/Ni for mechanically stable silicon anodes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1039/c7ta08744f
Wurigumula Bao _{1,

2,

3,

4,

5} , Jing Wang _{1,

2,

3,

4,

5} , Shi Chen _{1,

2,

3,

4,

5} , Weikang Li _{1,

2,

3,

4,

5} , Yuefeng Su _{1,

2,

3,

4,

5} , Feng Wu _{1,

2,

3,

4,

5} , Guoqiang Tan _{1,

2,

3,

4,

5} , Jun Lu _{6,

7,

8}

Affiliation

The main challenges associated with silicon anodes are their poor conductivity and severe structural degradation during cycling. Here we design a three-dimensional sandwich hierarchical structure that tackles these problems, and we demonstrate its use in flexible, large-area silicon anode assemblies. The design of the electrode is achieved via plasma enhanced chemical vapor deposition of silicon nanoparticles onto three-dimensional nickel foam followed by conformal coating of cyclized-PAN on the silicon surface, thus forming a sandwiched cyclized-PAN/Si/Ni hierarchical structure. The three-dimensional networks provide abundant electroactive zones and conductive transport paths, the conformal coating of cyclized-PAN accommodates volume change during cycling, and the monolithic electrode configuration without additional binders or conductive agents improves the energy density of the whole electrode. Furthermore, as a result of the sandwich hierarchical arrangement, the solid-electrolyte interface of the anode remains stable and spatially confined, leading to an increased reversible capacity and improved cycling stability (910 mA h g⁻¹ after 100 cycles at 1.0 A g⁻¹).

中文翻译：

机械稳定的硅阳极的环化PAN / Si / Ni三维层次结构

与硅阳极相关的主要挑战是其导电性差以及在循环过程中严重的结构退化。在这里，我们设计了可解决这些问题的三维夹心分层结构，并展示了其在柔性大面积硅阳极组件中的使用。电极的设计是通过以下方式实现的等离子体增强了硅纳米粒子在三维镍泡沫上的化学气相沉积，然后在硅表面上共形涂覆了环化PAN，从而形成了一个夹心的环化PAN / Si / Ni分层结构。三维网络提供了丰富的电活性区域和导电传输路径，环化PAN的保形涂层可适应循环过程中的体积变化，而无需额外粘合剂或导电剂的整体式电极配置可改善整个电极的能量密度。此外，由于采用了三明治式分层结构，阳极的固体电解质界面保持稳定并在空间上受到限制，从而提高了可逆容量并改善了循环稳定性（910 mA hg ^-1在1.0A g ^-1下100个循环之后。

更新日期：2017-11-17

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