期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 844, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156118
关键词
Sodium-ion battery; Cathode material; Na3V2(PO4)(3); Nitrogen doped carbon; Organophosphonic acid
资金
- Six Talents Peak Project of Jiangsu Province [2015-XNYQC-008, 2016-XNYQC-003]
- Research Foundation for Advanced Talents of Jiangsu University [12JDG054, 13JDG071]
Na super ionic conductor (NASICON)-type Na3V2(PO4)(3) has been regarded as one of the most attractive cathode materials for sodium-ion batteries (SIBs). However, its intrinsically low electronic conductivity leads to poor cyclability and rate capability. Carbon coating is an effective way to solve this problem, especially N-doped carbon. In this work, an organophosphonic acid, amino tris(methylene phosphonic acid) (ATMP), is employed as a multifunctional raw material for constructing N-doped carbon coated Na3V2(PO4)(3). Na3V2(PO4)(3) particles are well embedded in an interconnected N-doped carbon, which facilitates fast sodium ion and electron transfer. When used as a cathode material for SIBs, the obtained Na3V2(PO4)(3)/N-doped carbon composite shows promising sodium storage properties. It delivers high reversible charge/discharge capacities of 101.4/101.6 mA h g(-1) at 1 C after 100 cycles. Moreover, it exhibits excellent rate capability (charge/discharge capacities of 100.5/100.4 at 5 C), and good long-term cycling stability (capacity retention of 90.1% after 600 cycles at 5 C). This work may provide an effective way for the synthesis of carbon coated Na3V2(PO4)(3) with good sodium storage performance. (c) 2020 Elsevier B.V. All rights reserved.
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