Candied-Haws-like Architecture Consisting of FeS₂@C Core–Shell Particles for Efficient Potassium Storage

Abstract

The major challenge faced by potassium-ion batteries (PIBs) lies in the shortage of high-performance and cost-effective electrode materials. Herein, we demonstrate a candied-haws structure containing FeS 2 @C core−shell units as an advanced anode for PIBs. This special material is featured with thin amorphous carbon as the shell, which can confine the active iron disulfide core during the (de)potassiation processes to maintain the structural integrity. Moreover, consecutive carbon nanofibers interconnect with each other to generate a high-performance three-dimensional conductive framework, contributing to attaining enhanced reaction kinetics. Consequently, when measured as an anode material for PIBs, the FeS 2 @C nanocomposite achieves a large reversible capacity of 292 mAh g −1 at 0.1 A g −1 after 300 cycles and a high-rate capacity of 183 mAh g −1 at 2 A g −1 .

Carbon‐based anode materials for potassium‐ion batteries: From material, mechanism to performance

“…Different from the particle morphology of the alloying materials, the morphology of intercalation‐conversion materials could be various like nanosheets, nanorods, nanowires, and other shapes. Thus, the extensive unique structures of carbon‐based intercalation‐conversion composite materials were proposed to better play the buffering role of the carbon skeleton and better utilize the reactivity of active materials, such as N/P co‐doped porous carbon sheets/CoP hybrids, 117 candied‐haws‐like FeS 2 @C core‐shell particles, 118 carbon‐coated mesoporous Co 9 S 8 nanoparticles on RGO, 119 yolk‐shell structured FeP@C nanoboxes, 120 Sb 2 S 3 @carbon nanowires, 121 sandwich‐like MoS 2 @SnO 2 @C, 122 and so on. Yolk‐shell FeS 2 @C structure on graphene matrix, applied as anode for PIBs, delivered a high reversible charge capacity of 451 mA h/g 88 .…”

Water‐Soluble Salt Template‐Assisted Anchor of Hollow FeS2 Nanoparticle Inside 3D Carbon Skeleton to Achieve Fast Potassium‐Ion Storage

“…Recently, transition metal sulfides (such as MoS 2 , CoS, and CuS) have aroused extensive attention in view of their high theoretical capacities, decent redox reversibilities, and low‐cost. [ 14–21 ] Nevertheless, most of the metal sulfides materials exhibit inferior rate capability and rapid capacity degradation because of their poor electrical conductivity and unavoidable structure collapse incurred by repeated K‐ions insertion and extraction process. [ 18,22 ] To address above issue, constructing a hybrid structure with carbon materials has been employed as an efficient strategy to improve the comprehensive performance of electrode materials.…”

Engineering hierarchical Sb2S3/N–C from natural minerals with stable phase-change towards all-climate energy storage

“…), (c) alloying-type (such as Si, Ge, Sn, etc.). [3][4][5][6][7][8][9] Through the utilization of their complexing reactions, a rich redox potential could be formed for multiple reaction-type materials, effectively meeting the demand for high-power density ESSs, such as Sb 2 S 3 , Bi 2 S 3 and SnS. 10 Among them, antimony sulde (Sb 2 S 3 ) was a promising candidate with excellent theoretical capacity (946 mA h g À1 ), mainly ascribed to its strong energy-storage abilities of cations/anions.…”