Dual Lithium Insertion and Conversion Mechanisms in a Titanium-Based Mixed-Anion Nanocomposite

被引：33

作者：

Dambournet, Damien ^{[1
]}

Chapman, Karena W. ^{[2
]}

Chupas, Peter J. ^{[2
]}

Gerald, Rex E., II ^{[1
]}

Penin, Nicolas ^{[3
]}

Labrugere, Christine ^{[3
]}

Demourgues, Alain ^{[3
]}

Tressaud, Alain ^{[3
]}

Amine, Khalil ^{[1
]}

机构：

[1] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

[3] Univ Bordeaux, CNRS, Inst Chim Mat Condensee Bordeaux, F-33607 Pessac, France

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 34期

关键词：

ELECTRODE MATERIALS; METAL FLUORIDES; LI; OXYFLUORIDES;

D O I：

10.1021/ja204284h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The electrochemical reaction of lithium with a vacancy-containing titanium hydroxyfluoride was studied. On the basis of pair distribution function analysis, NMR, and X-ray photoelectron spectroscopy, we propose that the material undergoes partitioning upon initial discharge to form a nanostructured composite containing crystalline LixTiO2, surrounded by a Ti-0 and LiF layer. The Ti-0 is reoxidized upon reversible charging to an amorphous TiF3 phase via a conversion reaction. The crystalline LixTiO2 is involved in an insertion reaction. The resulting composite electrode, Ti-0-LiF/LixTiO2 double left right arrow TiF3/ LiyTiO2, allows reaction of more than one Li per Ti, providing a route to higher capacities while improving the energy efficiency compared to pure conversion chemistries.

引用

页码：13240 / 13243

页数：4

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