Graphene supported FeS2 nanoparticles with sandwich structure as a promising anode for High-Rate Potassium-Ion batteries

• Published in: Journal of colloid and interface science 2023-04, Vol.636, p.73-82
• Main Authors: Zhou, Xinyu, Wang, Ziwei, Wang, Yajun, Du, Fan, Li, Yinhuan, Su, Yaqiong, Wang, Mingyue, Ma, Mingming, Yang, Guorui, Ding, Shujiang
• Format: Article
• Language: English
• Subjects: Anode material; High-rate; In-situ X-ray diffraction; Potassium-ion batteries
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2022.12.168

[Display omitted] •The unique sandwich structure improves the K+ transfer kinetics and buffers the electrode volume expansion .•The FeS2@C-rGO anode exhibits high-rate capability and stable cycle performance.•In-situ XRD measurements recorded the phase transition and elucidated the electrochemical reaction mechanism.•DFT calculations confirmed that the introduction of graphene improves the potassium storage capacity and ion mobility. Pyrite FeS2 now emerges as a promising anode for potassium-ion batteries (PIBs) due to its low cost and high theoretical capacity. However, the significant volume expansion, low electrical conductivity, and the ambiguous mechanism related to potassium storage severely hinder its development for PIBs anodes. Herein, FeS2 nanostructures are skillfully dispersed on the graphene surface layer by layer (FeS2@C-rGO) to form a sandwich structure by using Fe-based metal organic framework (Fe-MOF) as precursors. The unique structural design can improve the transfer kinetics of K+ and effectively buffer the volume expansion during cycling, thereby enhancing the potassium storage performance. As a result, the FeS2@C-rGO delivers a high capacity of 550 mAh/g at a current density of 0.1 A/g. At a high rate of 2 A/g, the capacity can maintain 171 mAh/g even after 500 cycles. Moreover, the electrochemical reaction mechanism and potassium storage behavior are revealed by in-situ X-ray diffractionand density functional theory calculations. This work not only provides a novel insight into the structural design of electrode materials for high-performance PIBs, but also proposes a valuable understanding of the potassium storage mechanism of the FeS2-based anode.