Synthesis and characterization of LiFePO4 and LiTi0.01Fe0.99PO4 cathode materials

被引：112

作者：

Wang, GX ^{[1
]}

Bewlay, S

Needham, SA

Liu, HK

Liu, RS

Drozd, VA

Lee, JF

Chen, JM

机构：

[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2500, Australia

[2] Univ Wollongong, ARC Ctr Excellence Nanostruct Electromat, Wollongong, NSW 2500, Australia

[3] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan

[4] Natl Synchroton Radiat Res Ctr, Hsinchu 300, Taiwan

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2006年 / 153卷 / 01期

关键词：

D O I：

10.1149/1.2128766

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Nanocrystalline LiFePO4 and doped LiTi0.01Fe0.99PO4 powders were synthesized via a sol-gel preparation route. High-resolution tunneling electron microscopy observation and energy dispersive spectroscopy, mapping show the homogeneous distribution of dopant Ti cations in the crystals. Fe and O K-edge X-ray absorption near-edge structure (XANES) measurements show that Ti4+ doping induces an increased unoccupied d-state in LiFePO4, resulting in an enhanced p-type semiconductivity. In situ Fe K-edge XANES measurements of Ti-doped and undoped LiFePO4 electrodes have been performed to determine the change of Fe valence during the lithium intercalation and de-intercalation processes. Both LiFePO4 and doped LiTi0.01Fe0.99PO4 cathodes demonstrate good electrochemical performance. (c) 2005 The Electrochemical Society. [DOI: 10.1149/1.2128766] All rights reserved.

引用

页码：A25 / A31

页数：7

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