Interfacial Coupling FeSe₂/MoS₂ Heterostructure as a Promising Cathode for Aluminum-Ion Batteries

Abstract

The affordable and high-capacity aluminum-ion batteries (AIBs) are potential candidates for energy-storage systems. Nevertheless, traditional transition-metal chalcogenide (TMC) cathodes encounter severe capacity decay and sluggish reaction kinetics, impeding the development of AIBs. Herein, we have prepared the heterostructured FeSe2/MoS2 nanoflowers as the cathodes for AIBs. The construction of the built-in electric field in the interface of two phases plays an important role in realizing rapid charge transport, stable structure, and increased reversible capacity. As a result, the heterostructured FeSe2/MoS2 nanoflowers cathodes deliver an outstanding discharge capacity of 222 mAh g–1 at 0.5 A g–1 and an excellent cycling stability of 116 mAh g–1 over 140 cycles at 1.0 A g–1. These works provide a versatile strategy for further boosting the electrochemical performance of AIBs.

Zeolitic imidazolate framework/Prussian blue analogue derived CoSe2/FeSe2 heterostructure for long-cycle aluminum-ion batteries

“…33–38 Therefore, the rational design of electrode materials is key in improvement of cycle life and energy density of AIBs. As previously reported, Bi 2 Te 3 /Sb 2 Te 3 , 39 ZnSe/SnSe 2 , 40 FeSe 2 /MoS 2 41 and Co 3 Se 4 /ZnSe 42 heterostructure materials have internal electric fields between the interfaces, enabling fast charge transfer and ion diffusion. 43–49 Cathode materials can provide excellent performance for AIBs based on the conversion mechanism, but only the active material of one phase provides charge transfer and the other phase usually provides physical support to prevent the collapse during the cycle.…”