Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7725869 | Journal of Power Sources | 2018 | 10 Pages |
Abstract
A prospective NASICON-type F-doped Na3V2(PO4)2.93F0.07/C (F-0.07-NVP/C) composite is synthesized by a solid-state reaction method. F-doping can restrain the structural degradation from Na3V2(PO4)3 to V2(PO4)3 and enhance the structural stability. Meanwhile, it can decrease the particle size to diminish the pathway of Na+ diffusion, which can increase ionic conductivity efficiently. The kinetic behavior is significantly improved and it is beneficial to reinforcing the electrochemical performance of F-doping composites. Compared with Undoped-NVP/C sample, F-0.07-NVP/C composite delivers a 113â¯mAh gâ1 discharge capacity at 10â¯mAâ¯gâ1, which is very close to the theoretical capacity (117â¯mAh gâ1). As for cycle performance, a reversible capacity of 97.8â¯mAh gâ1 can be obtained and it retains 86% capacity after 1000 cycles at 200â¯mAâ¯gâ1. F-0.07-NVP/C composite presents the highest DNa+ (2.62â¯Ãâ¯10â15 cm2sâ1), two orders of magnitude higher than the undoped sample (4.8â¯Ãâ¯10â17 cm2sâ1). This outstanding electrochemical performance is ascribed to the synergetic effect from improved kinetic behavior and enhanced structural stability due to F-doping. Hence, the F-doped composite would be a promising cathode material in SIB for energy storage and conversion.
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Authors
Yanjun Chen, Youlong Xu, Xiaofei Sun, Baofeng Zhang, Shengnan He, Long Li, Chao Wang,