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Preventing structural degradation from Na3V2(PO4)3 to V2(PO4)3: F-doped Na3V2(PO4)3/C cathode composite with stable lifetime for sodium ion batteries
Journal of Power Sources ( IF 9.2 ) Pub Date : 2018-01-04 , DOI: 10.1016/j.jpowsour.2017.12.073
Yanjun Chen , Youlong Xu , Xiaofei Sun , Baofeng Zhang , Shengnan He , Long Li , Chao Wang

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 113 mAh g−1 discharge capacity at 10 mA g−1, which is very close to the theoretical capacity (117 mAh g−1). As for cycle performance, a reversible capacity of 97.8 mAh g−1 can be obtained and it retains 86% capacity after 1000 cycles at 200 mA g−1. F-0.07-NVP/C composite presents the highest DNa+ (2.62 × 10−15 cm2s−1), two orders of magnitude higher than the undoped sample (4.8 × 10−17 cm2s−1). 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.



中文翻译:

防止从Na 3 V 2(PO 43到V 2(PO 43的结构退化:掺F的Na 3 V 2(PO 43 / C阴极复合材料,具有稳定的钠离子电池寿命

通过固相反应法合成了预期的NASICON型的F掺杂的Na 3 V 2(PO 42.93 F 0.07 / C(F-0.07-NVP / C)复合材料。F掺杂可以抑制从Na 3 V 2(PO 43到V 2(PO 43的结构降解并增强结构稳定性。同时,它可以减小粒径以减少Na +的途径扩散,可以有效地提高离子电导率。动力学行为得到显着改善,并且有利于增强F掺杂复合材料的电化学性能。与未掺杂的-NVP / C样品相比,F-0.07-NVP / C复合材料提供了一个113毫安克-1以10mA克的放电容量-1,这是非常接近理论容量(毫安117克-1)。关于循环性能,可获得97.8mAh g -1的可逆容量,并且在200mA g -1下1000次循环后其保持86%的容量。F-0.07-NVP / C复合材料具有最高的D Na +(2.62×10 -15 cm 2 s -1),比未掺杂样品(4.8×10 -17 cm 2 s -1)高两个数量级。这种出色的电化学性能归因于由于F掺杂改善的动力学行为和增强的结构稳定性而产生的协同效应。因此,掺F的复合材料将成为SIB中用于能量存储和转换的有希望的阴极材料。

更新日期:2018-01-04
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