Crystallization behavior of Na 2 MnP 2 O 7 precursor glass was examined. Layered type Na 2 MnP 2 O 7 was formed at 461 • C for 3 h in N 2 filled electric furnace. Irreversible phase change was confirmed from layered Na 2 MnP 2 O 7 to -Na 2 MnP 2 O 7 over 600 • C. At 650 • C crystallized phase was completely changed to phase. By means of charge and discharge testing it is found that layered Na 2 MnP 2 O 7 is also active as cathode in sodium ion batteries. We found glass-ceramics technology is one of the suitable process for the synthesis of layered Na 2 MnP 2 O 7 cathode without any complicate process.
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