23October2019

Nano-Micro Letters

Flexible Conductive Anodes Based on 3D Hierarchical Sn/NS-CNFs@rGO Network for Sodium-Ion Batteries

Linqu Luo1, Jianjun Song1, *, Longfei Song1, Hongchao Zhang1, Yicheng Bi2, Lei Liu3, Longwei Yin4, Fengyun Wang1, *, Guoxiu Wang5, *

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Nano-Micro Lett. (2019) 11: 63

First Online: 01 August 2019 (Article)

DOI:10.1007/s40820-019-0294-9

*Corresponding author. E-mail: xjianjun.song@qdu.edu.cn (Jianjun Song); fywang@qdu.edu.cn (Fengyun Wang); Guoxiu.Wang@uts.edu.au (Guoxiu Wang)

 

Abstract

 


Toc

Metallic Sn has provoked tremendous progress as an anode material for high-capacity sodium‑ion batteries (SIBs). However, Sn anodes suffer from a dramatic capacity fading, owing to pulverization induced by drastic volume expansion during cycling. Herein, a highly flexible three-dimensional (3D) hierarchical conductive network electrode is designed by constructing Sn quantum dots (QDs) encapsulated in one dimensional N,S co-doped carbon nanofibers (NS-CNFs) sheathed within two-dimensional (2D) reduced graphene oxide (rGO) scrolls. In this ingenious strategy, 1D NS-CNFs are regarded as ideal building blocks to prevent the aggregation and pulverization of Sn QDs during sodiation/desodiation, which enhances the sodium storage capacity. In addition, 2D rGO act as electrical roads and “bridges” among NS-CNFs to improve the conductivity of the electrode and enlarge the contact area with electrolyte. Because of the unique structural merits, the flexible 3D hierarchical conductive network was directly used as binder- and current collector‑free anode for SIBs, exhibiting ultralong cycling life (373 mAh g-1 after 5000 cycles at 1 A g-1), and excellent high-rate capability (189 mAh g-1 at 10 A g-1). This work provides a facile and efficient engineering method to construct 3D hierarchical conductive electrodes for other flexible energy-storage devices.


 

Keywords

Sn quantum dots; Reduced graphene oxide; N,S co-doped carbon nanofibers; Flexible electrodes; Sodium‑ion batteries

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