| Résumé | Molybdenum dioxide (MoO₂) has attracted lots of theoretical interest as an anode material for sodium ion batteries (SIBs) due to its high theoretical capacity (836 mA h g⁻¹) and metallic electrical conductivity (1.9 × 10² S cm⁻¹). The insertion reaction, forming Na0.98MoO₂ and the reversible conversion reaction, forming Mo and Na2O from Na0.98MoO₂ contribute capacities of 209 and 627 mA h g⁻¹, respectively, the latter occupies 75% of the totally theoretical capacity. However, intrinsic slow kinetics in bulk MoO₂ severely restricts the redox conversion reaction. In the present work, a walnut-like MoO₂ architecture (W-MoO₂) with opened multi-channel and interconnected skeleton was prepared in a tube furnace, providing an interconnected ion/electron dual-pathway, which effectively facilitates Na⁺ diffusion and reduces the internal resistance of the cells. The W-MoO₂ anode demonstrates an enhanced reversible sodium storage capacity of 354.7 mA h g⁻¹ at 0.5 A g⁻¹. |
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