期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 282, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.125938
关键词
Sodium-ion batteries; Cathode material; Na(3)MuTi(PO4)(3); Vanadium doping
资金
- National Natural Science Foundation of China [52074098]
- State Grid Heilongjiang Electric Power Co., Ltd, Technology Project Funding [522437200032]
- Foundation of Key Program of Sci-Tech Innovation in Ningbo [2019B10114]
The study demonstrates that vanadium doping can enhance the electrochemical performance of Na3MnTi(PO4)(3)/C, resulting in higher specific capacity and outstanding cyclability.
Na3MnTi(PO4)(3)/C is a high-energy sodium-ion battery (SIBs) cathode material. However, the low rate performance and unfavorable cycle life limit its practical applications. Herein, Na-3 Mn1-xVxTi(PO4)(3)/C (x = 0, 0.01, 0.05, 0.10) were synthesized by a facile sol-gel method and the performance has been researched via the difference of vanadium doping amount. X-ray diffraction (XRD) indicates that vanadium doping has no obvious effect on the crystal structure. X-ray photoelectron spectroscopy (XPS) and Energy dispersive X-ray spectroscopy (EDS) mapping images show that vanadium has been successfully doped into the material. Cyclic voltammogram (CV) displays obviously three pairs of redox couples, corresponding to the Ti3+/Ti4+, Mn2+/Mn3+ and Mn3+/ Mn4+ redox couples, respectively, and is mainly controlled by diffusion and exhibits pseudo-capacitance behavior. The experimental results indicate that vanadium doping can improve the electrochemical performance of Na3MnTi(PO4)(3)/C, the high specific capacity (116.5 mAh g(-1) with a coulomb efficiency of 100% at 0.2C after 100 cycles, 91.8 mAh g(-1) higher than that of undoped sample), outstanding cyclability (approximate to 73.6% capacity retention after 500 cycles at 1C, 58.3% higher than that of undoped sample) for Na3Mn0.95V0.05Ti(PO4)(3) make the vanadium doping become a promising modification method.
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