Wadsley–Roth Phase V ₂ Nb ₁₀ O ₂₉ as a High-Power Lithium-Ion Battery Anode

Wadsley–Roth oxides offer a rich compositional platform for safer, high-power lithium-ion battery anodes yet vanadium-containing members remain largely unexplored. Here, we investigate the Wadsley–Roth phase V 2 Nb 10 O 29, synthesized by a conventional solid-state route. Synchrotron X-ray diffraction confirms that V 2 Nb 10 O 29 adopts an orthorhombic Ti 2 Nb 10 O 29 -type structure built from (3 × 4) ∞ ReO 3 -type blocks. As a lithium-insertion electrode, it delivers an initial reversible capacity of ∼270 mAh g –1 at 20 mA g –1, with an average voltage of ∼1.56 V vs Li/Li + over 0.8–2.8 V, corresponding to ∼16 Li + per formula unit through cooperative multielectron V and Nb redox. In situ X-ray diffraction reveals a solid-solution behavior with anisotropic lattice evolution characteristic of crystallographic shear frameworks. Molecular dynamics simulations further indicate low-barrier, quasi-one-dimensional Li diffusion within the ReO 3 -type blocks. These findings expand the compositional scope of Wadsley–Roth oxides and establish V 2 Nb 10 O 29 as a promising high-power anode material.