Synthesis of tetrahedral LiFeO2 and its behavior as a cathode in rechargeable lithium batteries

被引：71

作者：

Armstrong, A. Robert ^{[1
]}

Tee, Daniel W. ^{[1
]}

La Mantia, Fabio ^{[2
]}

Novak, Petr ^{[2
]}

Bruce, Peter G. ^{[1
]}

机构：

[1] Univ St Andrews, Sch Chem, EaStCHEM, St Andrews KY16 9ST, Fife, Scotland

[2] Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2008年 / 130卷 / 11期

关键词：

D O I：

10.1021/ja077651g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Synthesis and structural characterization of the first LiFeO2 compound with tetrahedrally coordinated Fe3+ is reported. When used as a positive intercalation electrode in a lithium cell, it can store charge of up to 120 mAhg(-1) at a rate of 100 mAg(-1). However, it converts to the defect spinel LiFe5O8 on cycling. By combining results from powder X-ray diffraction, differential electrochemical mass spectrometry, electrochemical cycling, and TG-MS, it is shown that such conversion, which involved oxygen loss, is not associated with direct O-2 gas evolution but instead reaction with the electrolyte. We suggest that intercalation/ deintercalation is accompanied by the exchange of Li+ by H+ in the material and subsequent loss of H2O, thus converting LiFeO2 to the defect spinel LiFe5O8 on cycling.

引用

页码：3554 / 3559

页数：6

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