21September2019

Nano-Micro Letters

SnS2@C Hollow Nanospheres with Robust Structural Stability as High-Performance Anodes for Sodium Ion Batteries

Shuaihui Li1, 2, †, Zhipeng Zhao1, 2, †, Chuanqi Li1, 2, Zhongyi Liu1, 2, * , Dan Li1, 2, *

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Nano-Micro Lett. (2019) 11: 14

First Online: 21 February 2019 (Article)

DOI:10.1007/s40820-019-0243-7

*Corresponding author. E-mail: liuzhongyi@zzu.edu.cn (Zhongyi Liu); danli@zzu.edu.cn (Dan Li)

 

Abstract

 


Toc

Constructing unique and highly stable structures with plenty of electroactive sites in sodium storage materials is a key factor for achieving improved electrochemical properties through favorable sodium ion diffusion kinetics. An SnS2@carbon hollow nanospheres (SnS2@C) has been designed and fabricated via a facile solvothermal route, followed by an annealing treatment. The SnS2@C hybrid possesses an ideal hollow structure, rich active sites, a large electrode/electrolyte interface, a shortened ion transport pathway, and, importantly, a buffer space for volume change, generated from the repeated insertion/extraction of sodium ions. These merits lead to the significant reinforcement of structural integrity during electrochemical reactions and the improvement in sodium storage properties, with a high specific reversible capacity of 626.8 mAh g-1 after 200 cycles at a current density of 0.2 A g-1 and superior high-rate performance (304.4 mAh g-1 at 5 A g-1). 


 

Keywords

SnS2@C; Hollow nanostructure; Anode materials; Sodium ion batteries

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