Preprint of "Two-Dimensional MoSe₂/MoS₂ and WSe₂/MoS₂ Heterostructures for Enhanced Lithium-Ion Storage"

High-performance lithium-ion batteries require advanced anode materials to overcome the intrinsic limitations of commercial graphite. Transition metal dichalcogenides (TMDs) such as MoS₂, MoSe₂, and WSe₂ offer high theoretical capacities and layered structures favorable for Li⁺ storage, yet their low conductivity and structural instability hinder practical application. Here, we report a simple solvothermal bottom-up approach to synthesize MoSe₂/MoS₂ and WSe₂/MoS₂ heterostructures. By adjusting the precursor-to-MoS₂ ratio, two distinct heterostructure architectures were obtained, differing in both composition and interfacial density. The well-defined heterointerfaces enhance charge transport, provide abundant active sites, and suppress volume expansion. Electrochemical testing shows superior performance over single-phase TMDs, with the interface-rich hybrid excelling in cycling stability and rate capability, and the MoSe₂/MoS₂ heterostructure delivering higher capacity. This study highlights interfacial engineering as a powerful strategy for designing high-performance TMD-based lithium-ion battery anodes.