In Situ Phase Transformation to form MoO₃−MoS₂ Heterostructure with Enhanced Printable Sodium Ion Storage

Abstract

Molybdenum trioxide (MoO3) possesses high energy density but often suffers from poor electrical conductivity and limited cycling stability when used as a sodium‐ion battery (SIB) anode. To address these issues, the construction of （Molybdenum trioxide‐Molybdenum disulfide）MoO3‐MoS2 heterostructures has proven effective in enhancing electronic conductivity, ion diffusion properties, and structural stability. Guided by the density functional theory (DFT) calculations, which predict favorable Na+ diffusion and adsorption properties, nanorod‐like MoO3‐MoS2 heterostructures are synthesized using a two‐step method. Benefiting from the synergistic effects of the heterostructure and nanosized morphology, the resulting MoO3‐MoS2 electrode exhibits outstanding rate performance (316 mA h g−1 at 10 A g−1) and long‐lasting cycling stability (286 mA h g−1 after 2300 cycles at 5 A g−1) as an SIB anode. In situ XRD measurements reveal that the ultrahigh specific capacity of MoO3‐MoS2 is attributed to the synergistic intercalation‐conversion storage of MoO3 and MoS2. In the pursuit of meeting commercialization requirements, electrodes with adjustable mass loading are also prepared using 3D printing, showcasing the high areal capacity characteristics of the SIBs. This study not only provides theoretical insights into expanding the use of heterojunction materials as SIB anodes but also demonstrates the significant potential for creating high‐energy‐density and cost‐effective SIBs.

Efficient sulfur atom-doped three-dimensional porous MXene-assisted sodium ion batteries

“…A novel category of two-dimensional transition metal carbides or nitrides, commonly known as MXenes, has garnered significant attention as promising anode materials in the field of newly explored SIBs. 9–12 These “MXene” materials are represented by the formula M n +1 X n T x , where M is a transition metal, such as titanium or vanadium, X is carbon and/or nitrogen, 13,14 and T is a surface termination group such as oxygen and fluorine functional groups. 15,16 When used as electrode materials, MXenes exhibit exceptional metallic conductivity, reaching values as high as 8000 S cm −1 , excellent hydrophilicity, and provide a highly active surface for redox reactions, leading to exceptional pseudocapacitance storage.…”

Synergistic Regulation of Built-In Electric Field and Interface Effect to Enhance the Reaction Kinetics and Stability of Lithium-Ion Batteries

“…Although the interface effect is applicable to multiple scenarios and has significant advantages, it cannot effectively improve reaction kinetics. The occurrence of redox reactions is the main way for metal oxide anode materials to store lithium, so the reaction kinetics largely depend on the ion/electron diffusion ability. − In heterostructured materials, due to the different Fermi levels of different materials, the charges near the interface are redistributed . The redistribution of charges leads to the formation of potential differences near the interface, which is the main reason for the generation of built-in electric fields.…”

Yolk–Shell MoS2 Nanosphere-Doped Electron-Rich Iron Heteroatoms for Ultralong Lifespan Na-Ion Batteries

“…Due to the inherent bottlenecks of LIBs, such as scarce natural resources and high cost, developing a new generation of high-energy-density rechargeable battery systems has become a global research hotspot. Recently, sodium-ion batteries (SIBs) have drawn extensive interest as a potential cost-effective candidate to LIBs owing to their rich resources on Earth, high safety, large theoretical capacity, suitable standard redox potential (Na/Na + ≈ −2.71 V), and environmentally friendly. − Nevertheless, owing to the bigger size of the alkali metal ion (Li + : 0.76 Å vs Na + : 1.02 Å), conventional graphite anodes with an insertion mechanism exhibit limited sodium storage capacity (merely < 30 mA h g –1 ) and unsatisfactory cycle life, while alloy-type anodes (Sn, Sb, Ge, etc.) undergo drastic volume variation and rapid capacity decay during repeated sodiation/desodiation. ,− Therefore, SIBs and LIBs share similar rocking chair operation mechanisms.…”