Characterization of sol-gel-synthesized LiFePO4 by multiple scattering XAFS

被引:55
作者
Giorgetti, M
Berrettoni, M
Scaccia, S
Passerini, S
机构
[1] Univ Bologna, Dept Phys & Inorgan Chem, I-40136 Bologna, Italy
[2] INSTM Bologna, Unita Ric, I-40136 Bologna, Italy
[3] ENEA, IDROCOMB, I-00060 Rome, Italy
关键词
D O I
10.1021/ic0521170
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
X-ray absorption spectroscopy (XAS) was used to investigate the local structure arrangements of submicrocrystalline lithium iron phosphate and its precursors. The former material, proven to be very promising as active cathode material in lithium metal and lithium-ion batteries, was synthesized through a new procedure that combines a simple sol-gel precipitation with a moderate temperature (e.g., low cost) heat treatment. X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectra taken at the Fe K-edge pointed out the modification of the Fe site during the synthesis steps that allow one to produce the submicrometer size crystalline LiFePO4 (active material) useful for batteries applications. The XAS investigation has shown that such a material is different from the conventional crystalline LiFePO4 on the short-range order. The difference is attributed to the synthesis procedure.
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页码:2750 / 2757
页数:8
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