期刊
CHEMICAL ENGINEERING JOURNAL
卷 386, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123953
关键词
Na3V2(PO4)(3); Nb5+ doping; Carbon coating; Electron conductivity; Sodium-ion batteries
资金
- National Natural Science Foundation of China [201878195, 201506133, 201805198]
- Youth Foundation of Sichuan University [2017SCU04A08]
- National Key Research and Development of China [2017YFB0307504, 2016YFD0200404]
- research Foundation for the Postdoctoral Program of Sichuan University [2017SCU12018, 2018SCU12045]
- China Scholarship Council
- National Institute for Material Science
- Australian Research Council (ARC) Future Fellowship [FT150100479]
Featuring favorable ion transfer and high thermal stability, NASICON-structured Na3V2(PO4)(3) has been regarded as a promising cathode candidate for sodium-ion batteries. However, this material might be impeded by inferior rate capability owing to its disappointing electron conductivity. To address this issue, a combined technique of carbon coating and Nb5+ doping was carried out for the first time. On one hand, the coated carbon nano-shell could construct an electron-conductive network and bu ffer the volume stain. On the other hand, the introduction of Nb5+ into the Na3V2(PO4)(3) crystal could regulate the relevant crystal parameters and create more vacancies, further facilitating the transfer of sodium ions. As a result, the optimized Nb-doped Na3V2(PO4)(3)@C material achieved an excellent performance of 81.6 mA h g(-1) at 50C and a high-capacity retention ratio of 80.8% even after 1600 cycles. This work not only highlights the signi ficance of carbon coating and Nb5+ doping, but also shows promising opportunities in potential cathode alternatives for sodium-ion batteries.
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