Micro-nano structure Na2MnPO4F/C as cathode material with excellent sodium storage properties

• Micro-nano structure Na2MnPO4F/C is prepared via wet ball milling and in situ pyrolytic carbon coating process.
• The aggregates are composed by small primary nanoparticles with a few dozens of nanometers.
• The material served as cathode exhibits good electrochemical performances in Na-ion battery.

Micro-nano structure Na2MnPO4F/C composite was prepared via wet ball milling and in situ pyrolytic carbon coating process. The micrometre-scale secondary aggregates are composed of small primary nanoparticles (10–30 nm) wrapped in carbon network, and present mesoporous structure. The material served as cathode in sodium ion (Na-ion) battery exhibits excellent capacity capability and cycling behavior. At a current density of 10 mA g−1, it can deliver a specific discharge capacity of 85.3 mAh g−1 at 30th cycle, with more than 70% of its original capacity. The enhanced electrochemical property can be attributed to the small primary particle size, high specific surface area and carbon coating effect. The current study suggests that the as-prepared Na2MnPO4F/C material shows promising electrochemical performance in Na-ion battery.

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