Issue 4, 2023

Impregnating ultrafine FeS2 nanoparticles within hierarchical carbon tubes for advanced potassium-ion batteries

Abstract

Transition-metal sulfides (TMSs) with high theoretical capacity and economical suitability are attractive anode materials for potassium-ion batteries (PIBs). However, the inherent low conductivity, tardy K+ diffusion kinetics, and huge volume change of TMSs pose a lot of challenges, impeding their practical application in PIBs. Herein, a simple template-assisted vulcanization strategy is presented for impregnating ultrasmall FeS2 nanoparticles within flexible carbon nanowires wrapped with robust amorphous carbon tubes (denoted as FeS2-C@CTs), resolving the abovementioned issues and improving the electrochemical performance of PIBs. Specifically, such a crafted FeS2-C@CT-based anode delivers a high reversible capacity of 524 mA h g−1 at 50 mA g−1, an intriguing rate capability of 208 mA h g−1 at 10 A g−1, and a decent cycling stability of 167 mA h g−1 at 10 A g−1 after 1000 cycles. More importantly, a full cell (K0.6CoO2//FeS2-C@CTs) also delivers an enhanced potassium storage performance, showing a high rate capacity of 123 mA h g−1 at 1 A g−1 and a long cycle life with a capacity retention rate of 87.6% after 200 cycles.

Graphical abstract: Impregnating ultrafine FeS2 nanoparticles within hierarchical carbon tubes for advanced potassium-ion batteries

Supplementary files

Article information

Article type
Research Article
Submitted
11 Nov 2022
Accepted
23 Dec 2022
First published
23 Dec 2022

Inorg. Chem. Front., 2023,10, 1286-1293

Impregnating ultrafine FeS2 nanoparticles within hierarchical carbon tubes for advanced potassium-ion batteries

Z. Zhang, Y. Qiao, Q. Deng, M. Jia, D. Liu, D. Dai and B. Li, Inorg. Chem. Front., 2023, 10, 1286 DOI: 10.1039/D2QI02393H

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