Corresponding Author

Yong YANG(yyang@xmu.edu.cn)


As a cathode material for sodium ion batteries, NaMnPO4/C nanocomposite is successfully synthesized by the combination of spraying drying and high temperature sintering methods. The crystal structure of the as-synthesized phosphate material is confirmed as the natrophilite NaMnPO4, which possesses orthorhombic symmetry and Pmnb space group. It is shown that the precursors are hollow spherical particles and the obtained product consists of micro-scaled secondary particles, which are composed of NaMnPO4 nanocrystallites (tens of nanometres) and amorphous carbon networks. The ionic and electronic conductivities of NaMnPO4 are both effectively enhanced with the help of this nanocomposite structure. In addition, the differences in the Na+-diffusion channel and local structures among the three types of NaMPO4, i.e. olivine, maricite and natrophilite, are also discussed. The electrochemical tests show that the natrophilite NaMnPO4 can deliver the reversible capacity of 90 mAh·g-1 at a current density of 7.75 mA·g-1 when cycled in the voltage range of 1.0-4.5 V (vs. Na+/Na).

Graphical Abstract


sodium ion batteries, cathode material, NaMnPO4, spraying drying, electrochemical performance

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