Electrochemical performance of mixed valence Na3V2O2x(PO4)2F3-2x/C as cathode for sodium-ion batteries

被引：83

作者：

Serras, Paula ^{[1
]}

Palomares, Veronica ^{[1
]}

Goni, Aintzane ^{[1
]}

Kubiak, Pierre ^{[2
]}

Rojo, Teofilo ^{[1
,2
]}

机构：

[1] Univ Basque Country, EHU, Dept Quim Inorgan, E-48080 Bilbao, Spain

[2] CIC ENERGIGUNE, Minano 01510, Spain

来源：

JOURNAL OF POWER SOURCES | 2013年 / 241卷

关键词：

Na-ion batteries; Electrochemistry; Mixed-valence; Sodium vanadium fluorophosphates; NEGATIVE-ELECTRODE MATERIALS; LITHIUM BATTERIES; FLUOROPHOSPHATE; SIZE;

D O I：

10.1016/j.jpowsour.2013.04.094

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

A composite made of a mixed-valence sodium-vanadium fluorophosphate and 6.4% wt. carbon, Na3V2O2x(PO4)(2)F3-2x/C (0 < x < 1), has been prepared. Structural and magnetic characterization confirmed the +3/+4 oxidation state of vanadium in the phase. Morphological and texture analyses showed that carbon forms a network surrounding the particles, leading to a mesoporous composite with a high specific area of 67 m(2) g(-1). Electrochemical characterization conducted in Swagelok cells by cyclic voltammetry and galvanostatic cycling indicated that sodium extraction/insertion proceeds through a complex mechanism in two voltage pseudo-plateaux at 3.6 and 4.1 V vs. Na/Na+ Rate capability of the material ranges from specific capacities of 100 mAh g(-1) at C/20 to 75 mAh g(-1) at 5C. Cycling stability at 1C showed coulombic efficiency higher than 99% and capacity retention of 95% after 200 cycles. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：56 / 60

页数：5

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