In Situ Hybridization Strategy Constructs Heterogeneous Interfaces to Form Electronically Modulated MoS[sub.2]/FeS[sub.2] as the Anode for High-Performance Lithium-Ion Storage

The interfacial effect is important for anodes of transition metal dichalcogenides (TMDs) to achieve superior lithium-ion storage performance. In this paper, a MoS[sub.2]/FeS[sub.2] heterojunction is synthesized by a simple hydrothermal reaction to construct the interface effect, and the heterostructure introduces an inherent electric field that accelerates the de-embedding process of lithium ions, improves the electron transfer capability, and effectively mitigates volume expansion. XPS analysis confirms evident chemical interaction between MoS[sub.2] and FeS[sub.2] via an interfacial covalent bond (Mo–S–Fe). This MoS[sub.2]/FeS[sub.2] anode shows a distinct interfacial effect for efficient interatomic electron migration. The electrochemical performance demonstrated that the discharge capacity can reach up to 1217.8 mA h g[sup.−1] at 0.1 A g[sup.−1] after 200 cycles, with a capacity retention rate of 72.9%. After 2000 cycles, the capacity retention is about 61.6% at 1.0 A g[sup.−1], and the discharge capacity can still reach 638.9 mA h g[sup.−1]. Electrochemical kinetic analysis indicated an enhanced pseudocapacitance contribution and that the MoS[sub.2]/FeS[sub.2] had sufficient adsorption of lithium ions. This paper therefore argues that this interfacial engineering is an effective solution for designing sulfide-based anodes with good electrochemical properties.