Issue 47, 2017

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

Abstract

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).

Graphical abstract: A three-dimensional hierarchical structure of cyclized-PAN/Si/Ni for mechanically stable silicon anodes

Article information

Article type
Paper
Submitted
03 oct. 2017
Accepted
02 nov. 2017
First published
08 nov. 2017

J. Mater. Chem. A, 2017,5, 24667-24676

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

W. Bao, J. Wang, S. Chen, W. Li, Y. Su, F. Wu, G. Tan and J. Lu, J. Mater. Chem. A, 2017, 5, 24667 DOI: 10.1039/C7TA08744F

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