Low-potential lithium-ion reactivity of vanadium oxide aerogels

被引：36

作者：

Augustyn, Veronica ^{[1
]}

Dunn, Bruce ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

来源：

ELECTROCHIMICA ACTA | 2013年 / 88卷

关键词：

Vanadium pentoxide; Energy storage; Aerogels; ELECTROCHEMICAL PROPERTIES; ELECTRODE MATERIALS; V2O5; AEROGEL; BATTERIES; LI; INTERCALATION; SPECTROSCOPY; MECHANISMS; XEROGEL; CELLS;

D O I：

10.1016/j.electacta.2012.10.145

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Vanadium oxide aerogels are electrochemically lithiated to 0.1V vs. Li/Li+, yielding reversible capacities of similar to 1000 mAh g(-1) at charge/discharge rates of C/10. This reversible behavior is significantly different from crystalline orthorhombic V2O5, which exhibits a constantly decreasing capacity with cycling. The ability of the aerogel material to be deeply cycled lies in its unique morphology: high surface area, interconnected porosity, and a fibrous network structure enable lithium storage to occur. Ex situ TEM and XPS measurements indicate, respectively, that the fibrous morphology is retained at low potentials and that the oxidation state of vanadium changes from +5 to +2 during the electrochemical cycling. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：530 / 535

页数：6

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