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Issue 23, 2019
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A nanosized SnSb alloy confined in N-doped 3D porous carbon coupled with ether-based electrolytes toward high-performance potassium-ion batteries

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Abstract

Potassium-ion batteries (PIBs) have been considered as a promising new-generation energy storage device because they can be used as a replacement or complement to lithium-ion batteries. However, the large radius and the sluggish diffusion kinetics of K+ make it a great challenge to develop high-performance electrode materials for PIBs. Herein, a novel nanocomposite of SnSb alloy confined in N-doped three-dimensional porous carbon (3D SnSb@NC) is fabricated by using the NaCl template-assisted in situ pyrolysis strategy and investigated as an anode for PIBs based on dimethoxyethane (DME)-based and conventional ester-based (EC/DEC) electrolytes. The uniformly anchored SnSb nanoparticles could effectively alleviate dramatic volume variation during potassiation/depotassiation owing to the synergistic effect of Sn and Sb. N-doped 3D porous carbon prevents the aggregation of SnSb nanoparticles, provides abundant active sites for K+, facilitates sufficient infiltration of the electrolyte, and serves as a conductive network to accelerate the electron transport. Moreover, the DME-based electrolyte shows superior wettability to the 3D SnSb@NC electrode and forms a thinner SEI film, resulting in negligible surface film impedance and reduced charge transfer impedance. Consequently, the rational 3D SnSb@NC structure coupled with an optimized DME-based electrolyte makes PIBs deliver a high reversible capacity of 357.2 mA h g−1 at 50 mA g−1, an remarkable initial coulombic efficiency (ICE) of 90.1%, good rate capability, and excellent cycling stability with a capacity retention of 80% after 200 cycles at 0.5 A g−1. This work presents an advanced concept for designing multifunctional anode materials with compatible electrolytes for high-performance PIBs.

Graphical abstract: A nanosized SnSb alloy confined in N-doped 3D porous carbon coupled with ether-based electrolytes toward high-performance potassium-ion batteries

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Supplementary files

Article information


Submitted
11 Apr 2019
Accepted
22 May 2019
First published
22 May 2019

J. Mater. Chem. A, 2019,7, 14309-14318
Article type
Paper

A nanosized SnSb alloy confined in N-doped 3D porous carbon coupled with ether-based electrolytes toward high-performance potassium-ion batteries

Z. Wang, K. Dong, D. Wang, S. Luo, Y. Liu, Q. Wang, Y. Zhang, A. Hao, C. Shi and N. Zhao, J. Mater. Chem. A, 2019, 7, 14309
DOI: 10.1039/C9TA03851E

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