Pair distribution function analysis and Mossbauer study of defects in microwave-hydrothermal LiFePO4

被引：29

作者：

Bini, Marcella ^{[1
]}

Ferrari, Stefania ^{[1
]}

Capsoni, Doretta ^{[1
]}

Mustarelli, Piercarlo ^{[1
]}

Spina, Gabriele ^{[2
]}

Del Giallo, Franco ^{[3
]}

Lantieri, Marco ^{[3
]}

Leonelli, Cristina ^{[4
]}

Rizzuti, Antonino ^{[5
]}

Massarotti, Vincenzo ^{[1
]}

机构：

[1] Univ Pavia, Dipartimento Chim, Sez Chim Fis, I-27100 Pavia, Italy

[2] Univ Florence, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, FI, Italy

[3] Ist Sistemi Complessi CNR, I-50019 Sesto Fiorentino, FI, Italy

[4] Univ Modena & Reggio Emilia, Dipartimento Ingn Mat & Ambiente, I-41125 Modena, Italy

[5] Politecn Bari, Dipartimento Ingn Acque & Chim, I-70125 Bari, Italy

来源：

RSC ADVANCES | 2012年 / 2卷 / 01期

关键词：

LI-ION; X-RAY; ELECTROCHEMICAL-BEHAVIOR; ELECTRODE MATERIALS; LITHIUM BATTERIES; DIFFRACTION; STATE; FE; ORDER; NMR;

D O I：

10.1039/c1ra00525a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Olivine-type LiFePO4 is nowadays one of the most important cathode materials of choice for high-energy lithium ion batteries. Its intrinsic defectivity, and chiefly the so-called lithium iron anti-site, is one of the most critical issues when envisaging electrochemical applications. This paper reports a combined diffractometric (Synchrotron Radiation XRD with Rietveld and PDF analyses) and spectroscopic (Mossbauer) approach able to give a thorough characterization of the material defectivity. Such analytical procedure has been applied to a sample prepared following an innovative microwave-assisted hydrothermal synthesis route that, in a few minutes, allowed us to obtain a well crystallized material. PDF analysis, which is applied for the first time to this type of battery material, reveals the presence of disorder possibly due to Li/Fe exchange or to a local symmetry lowering. A 5% amount of iron on the lithium site has been detected both by PDF as well as by Mossbauer spectroscopy, which revealed a small percentage of Fe3+ on the regular sites.

引用

页码：250 / 258

页数：9

共 53 条

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