X-Ray Photoelectron Spectroscopy Investigations of Carbon-Coated LixFePO4 Materials

被引：241

作者：

Dedryvere, R. ^{[1
]}

Maccario, M. ^{[2
,3
]}

Croguennec, L. ^{[2
,3
]}

Le Cras, F. ^{[4
]}

Delmas, C. ^{[2
,3
]}

Gonbeau, D. ^{[1
]}

机构：

[1] Univ Pau & Pays Adour, IPREM ECP, UMR 5254, F-64053 Pau 9, France

[2] CNRS, Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France

[3] Univ Bordeaux, Inst Chim Mat Condensee Bordeaux, ENSCPB, F-33608 Pessac, France

[4] Commissariat Energie Atom, Lab Composants Energie, DRT LITEN DTNM LCE, F-38054 Grenoble 9, France

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 22期

关键词：

D O I：

10.1021/cm801995p

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 [物理化学]; 081704 [应用化学];

摘要：

Because of its surface sensitivity, X-ray photoelectron spectroscopy allowed us to access the mechanisms at the very surface of 100 nm diameter carbon-coated LiFePO4 nanoparticles. A continuous evolution of the Fe3+/Fe2+ ratio was observed at the Surface of the particles upon charge and discharge, in good agreement with the change in the average lithium content of LixFePO4 electrode material. These results support these models considering migration of a reaction front along the a-axis inside the cristallites vs. the shrinking-core model, to describe lithium (de)intercalation in LiFePO4. XPS analyses showed also that electrode/electrolyte interface phenomena are minimized using carbon-coated LiFePO4 particles as positive electrode material vs LiCoO2 for instance, despite the nanometric size of the particles.

引用

页码：7164 / 7170

页数：7

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