A novel solid-state synthesis route for high voltage Na3V2(PO4)2F3−2yO2y cathode materials for Na-ion batteries

A novel solid-state synthesis route is used to synthesize phase-pure NVPF 3−2 y O 2 y compounds using (VO) 2 P 2 O 7 as precursor. The products show promising electrochemical properties, in particular NVPF 2 O, thanks to a fully solid solution reaction mechanism.