期刊
JOURNAL OF POWER SOURCES
卷 326, 期 -, 页码 14-22出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.06.096
关键词
Sodium ion batteries; Na3V2(PO4)(3) cathode; Controllable synthesis; Porous sponge shape
资金
- National Key Basic Research Program of China [2015CB251100]
- Program for New Century Excellent Talents in University [NCET-13-0033]
- Beijing Co-construction Project [20150939014]
Structural and morphological control is an effective approach for improvement of electrochemical performance in rechargeable batteries. In this paper, three different morphological Na3V2(PO4)(3) (irregular shaped, the porous sponge-like and plate like) were successfully prepared through controlling the amount of oxalic acid by a simple two-step reduction method. It is found that the amount of oxalic acid has vital impacts on the morphology of Na3V2(PO4)(3); moreover, the morphological evolution and formation mechanism are proposed based on the reactions of different amount of oxalic acid occurring in the two-step reduction process. The excellent electrochemical performances of the porous sponge-like Na3V2(PO4)(3) are attributed to the unique morphology. The initial capacity of the porous sponge-like Na3V2(PO4)(3) is 101.77 mAh g(-1) at 30 C; after 700 cycles, it remains as high as 89.28 mAh g(-1) with only 12% capacity loss. When the current density increases to 50 C and 70 C, the capacity retentions of 81% after 600 cycles, and 92.5% after 500 cycles are achieved, respectively. (C) 2016 Published by Elsevier B.V.
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