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

页码：358 / 365

页数：8

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