Synthesis of NaMnPO₄ by Spraying Drying-High Temperature Sintering and Its Electrochemical Performance

Authors

Xiao-chen LIN
Xiao-biao WU
Xu HOU
Yong YANGFollow

Corresponding Author

Yong YANG(yyang@xmu.edu.cn)

Abstract

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

Keywords

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

DOI Link

https://doi.org/10.13208/j.electrochem.140416

Publication Date

2014-12-28

Online Available Date

2014-04-28

Revised Date

2014-04-23

Received Date

2014-04-16

Recommended Citation

Xiao-chen LIN, Xiao-biao WU, Xu HOU, Yong YANG. Synthesis of NaMnPO₄ by Spraying Drying-High Temperature Sintering and Its Electrochemical Performance[J]. Journal of Electrochemistry, 2014 , 20(6): 140416.
DOI: 10.13208/j.electrochem.140416
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss6/12