High voltage cathode materials for Na-ion batteries of general formula Na 3V 2O 2x(PO 4) 2F 3-2x

1. Serras, P.
2. Palomares, V.
3. Goñi, A.
4. Gil De Muro, I.
5. Kubiak, P.
6. Lezama, L.
7. Rojo, T.