Fluorination of anatase TiO2 towards titanium oxyfluoride TiOF2: a novel synthesis approach and proof of the Li-insertion mechanism

被引：51

作者：

Louvain, N. ^{[1
,2
]}

Karkar, Z. ^{[1
,2
]}

El-Ghozzi, M. ^{[1
,2
]}

Bonnet, P. ^{[1
,2
]}

Guerin, K. ^{[1
,2
]}

Willmann, P. ^{[3
]}

机构：

[1] Univ Blaise Pascal, Clermont Univ, Inst Chim Clermont Ferrand, F-63000 Clermont Ferrand, France

[2] Inst Chim Clermont Ferrand, UMR 6296, CNRS, F-63177 Aubiere, France

[3] Ctr Natl Etud Spatiales, F-31055 Toulouse, France

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2014年 / 2卷 / 37期

关键词：

ION BATTERY; ELECTRONIC-PROPERTIES; CATHODE MATERIAL; METAL FLUORIDES; LITHIUM; STORAGE; DECOMPOSITION; NANOMATERIALS; PERFORMANCE; FABRICATION;

D O I：

10.1039/c4ta02553a

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 reactivity of pure molecular fluorine F-2 allows the creation of new materials with unique electrochemical properties. We demonstrate that titanium oxyfluoride TiOF2 can be obtained under molecular fluorine from anatase titanium oxide TiO2, while the fluorination of rutile TiO2 leads only to pure fluoride form TiF4. Contrary to most fluorides, TiOF2 is air-stable and hydrolyses poorly under humid conditions. Such a stability makes it possible for TiOF2 to be studied as an electrode material in Li-ion secondary battery systems. It shows the capacity as high as 220 mA h g(-1) and good cyclability at high current rates at an average potential of 2.3 V vs. Li+/Li. At such a potential, only Li+ insertion occurs, as proven by in operando XRD/electrochemistry experiments.

引用

页码：15308 / 15315

页数：8

共 42 条

[1] Fluoride based electrode materials for advanced energy storage devices [J].