Temperature Dependence of Structural and Transport Properties for Na3V2(PO4)2F3 and Na3V2(PO4)2F2.5O0.5

被引：41
作者：
Broux, Thibault [1 ,2 ,4 ]
Fleutot, Benoit [2 ,4 ]
David, Renald [2 ,4 ]
Brull, Annelise [1 ,4 ]
Veber, Philipye [1 ]
Fauth, Francois [3 ]
Courty, Matthieu [2 ,4 ,5 ]
Croguennec, Laurence [1 ,4 ,5 ]
Masquelier, Christian [2 ,4 ,5 ]
机构：
[1] Univ Bordeaux, CNRS, Bordeaux INP, ICMCB UPR 9048, F-33600 Pessac, France
[2] Univ Picardie Jules Verne, CNRS UMR 7314, Lab Reactivite & Chim Solides, F-80039 Amiens, France
[3] CELLS ALBA Synchrotron, E-08290 Barcelona, Spain
[4] RS2E, Reseau Francais Stockage Electrochim Energie, FR CNRS 3459, F-80039 Amiens 1, France
[5] ALISTORE ERI European Res Inst, FR CNRS 3104, F-80039 Amiens 1, France
来源：
CHEMISTRY OF MATERIALS | 2018年 / 30卷 / 02期
关键词：
NA-ION BATTERIES; CATHODE MATERIALS; LITHIUM-ION; ELECTROCHEMICAL PERFORMANCE; HYBRID-ION; SODIUM; FLUOROPHOSPHATE;
D O I：
10.1021/acs.chemmater.7b03529
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Among polyanionic-based electrode materials developed for Na-ion batteries, one of the most promising families turns out to be Na3V2(PO4)(2)F3-yOy (0 <= y <= 2). Here, we present the influence of the oxygen substitution for fluorine on the structural and transport properties of Na3V2(PO4)(2)F3-yOy, as a function of temperature, through the comparison of the two compositions y = 0 and y = 0.5. An order-disorder phase transition is observed, whatever the content in oxygen, in relation with changes in the ionic conductivity and thus with the mobility of the Na+ ions within the tunnels of the tridimensional structure. The richer the content in oxygen in Na3V2(PO4)(2)F3-yOy, the higher is the electronic conductivity, in relation with the mixed valence state V3+/V4+ within the bioctahedral units V2O8F3-yOy, and the better are the electrochemical performances in Na-ion batteries.
引用
收藏
页码：358 / 365
页数：8
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