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| Electrochemical performance of carbon-coated Na3.35Mn1.15Ti0.80V0.05(PO4)3 cathode materials |
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Received:December 03, 2024
Revised:December 06, 2024
Accepted:December 07, 2024
Published Online:January 21, 2025
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| DOI： |
| KeyWord:sodium ion battery; cathode material; Na3MnTi(PO4)3; vanadium doping; carbon coating |
| Author | Institution |
| Ma Yibo |
Beijing Easpring Material Technology Co.Ltd |
| Yang Haoran |
Beijing Easpring Material Technology Co.Ltd |
| Ling Shigang |
Beijing Easpring Material Technology Co.Ltd |
| Zhao Hailei |
University of Science and Technology Beijing |
| Liu Yafei |
Beijing Easpring Material Technology Co.Ltd |
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| Abstract: |
| Sodium super ion conductor (NASICON) type Na3MnTi(PO4)3 (NMTP) is a promising cathode material due to high voltage and low cost. However, its practical application is hindered by poor electric conductivity and low coulombic efficiency. In order to solve these problems, carbon-free and citric acid coated Na3.35Mn1.15Ti0.80V0.05(PO4)3 (NMTVP) samples were prepared by spray drying, respectively. X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) were used to characterize the structure and morphology of the samples. A dense carbon layer is formed on the surface of NMTVPcathode by citric acid, which can be also used as the dispersant to keep transition metal uniform distribution, reduce the cation mixing, and inhibit the formation of impurity phase, such as Mn(PO3)2 and NaTi2(PO4)3. Carbon coating can effectively isolate the direct contact between cathode and electrolyte, suppress the interface side reaction and manganese dissolution, and thus reduce the interfacial impedance. The carbon coated NMTVP@C exhibits excellent electrochemical performance, its initial discharge specific capacity reaches 96.2 mAh.g-1 at 0.1C rate, and shows significantly improved rate and cycling performance. |
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