Abstract
Antimony (Sb)-based materials are attractive as anodes in potassium ion batteries (PIBs). However, poor cycling and volume expansion of the Sb-based anodes hinder their development in PIBs. In this work, we prepared a novel three-dimensional Sb nanoparticle/polypyrrole/carbon nanotube (Sb/PPy/CNT) hybrid anode material. The obtained Sb/PPy/CNT maintained a discharge capacity of 555.1 mAh g−1 after 200 cycles at a current density of 100 mA g−1, and 347.5 mAh g−1 after 600 cycles at a high current density of 1000 mA g−1, showing outstanding potassium storage capacity and cycling performance. This excellent performance was attributed to the array of electron transfer networks formed in the hydrogel network, as well as inhibition of the volume expansion exhibited by potassium ions during embedding/detachment of the CNTs and Sb nanoparticles arising from encapsulation by PPy films. This study provides a prerequisite for expanding the use of high-performance anode materials for PIBs.
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