Structural characterization of an amorphous VS4 and its lithiation/delithiation behavior studied by solid-state NMR spectroscopy

Amorphous VS₄ (a-VS₄) is prepared from the crystalline one (c-VS₄). Li insertion into a-VS₄ involves the amorphous–amorphous phase transition from Peierls-distorted chain-like structure to [VS₄]³⁻ tetrahedra-based structure.