Sodium Layered Oxide Cathode Materials

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

“…6 Nonetheless, layered transitions metal oxides suffer from low average working voltage and irreversible phase changes during the sodiation and de(sodiation) process, that oen results in a loss of structural stability and capacity fade. 7 Alternatively, polyanionic compounds are established as promising cathode materials for Li-ion and Na-ion batteries due to their high operating voltage, stable crystal structure, and high ionic conductivity. 8 The vanadium-based oxy-uorophosphates Na 3 V 2 (PO 4 ) 2 F 3−2y O 2y (0 # y # 1, in short NVPF 3−2y O 2y in the following) are of particular interest.…”

“…6 Nonetheless, layered transitions metal oxides suffer from low average working voltage and irreversible phase changes during the sodiation and de(sodiation) process, that often results in a loss of structural stability and capacity fade. 7…”