Coupled X-ray diffraction and electrochemical studies of the mixed Ti/V-containing NASICON: Na2TiV(PO4)3

被引：43
|
作者：
Lalere, F. [1 ,2 ]
Seznec, V. [1 ,2 ]
Courty, M. [1 ,2 ]
Chotard, J. N. [1 ,2 ]
Masquelier, C. [1 ,2 ]
机构：
[1] Univ Picardie Jules Verne, CNRS, Lab Reactivite & Chim Solides, UMR 7314, F-80039 Amiens 1, France
[2] FR CNRS, Reseau Francais Stockage Electrochim Energie, RS2E, F-3459 Paris, France
来源：
JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 15期
关键词：
CARBON MATRIX; SODIUM; NA3V2(PO4)(3); BATTERY; CATHODE; PHOSPHATES; ELECTRODE; OPERANDO; FE;
D O I：
10.1039/c7ta10689k
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：
The solid state synthesis of NaTiV(PO4)(3) and Na3TiV(PO4)(3) is reported. Soft chemical oxidation of the latter composition led to NASICON Na2TiV(PO4)(3) with intermediate unit cell parameters (s.g.: R (3) over barc, a = 8.610(3) angstrom, c = 21.755(6) angstrom) when compared to NaTiV(PO4)(3) and Na3TiV(PO4)(3). Coupled structural/electrochemical studies were carried out on Na2TiV(PO4)(3) for oxidation and reduction by operando X-ray diffraction. While the oxidation mechanism towards NaTiV(PO4)(3) is quite simple, the reduction mechanisms involve several mono-and bi-phasic mechanisms leading to Na3TiV(PO4)(3) as an intermediate composition and to Na4TiV(PO4)(3) eventually.
引用
收藏
页码：6654 / 6659
页数：6
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