A kinetic study of electrochemical lithium insertion in nanosized rutile β-MnO2 by impedance spectroscopy

被引：30

作者：

Bach, S. ^{[1
,2
]}

Pereira-Ramos, J. P. ^{[1
]}

Willmann, P. ^{[3
]}

机构：

[1] Univ Paris 12, Inst Chim & Mat Paris Est, CNRS, UMR 7182,GESMAT, F-94320 Thiais, France

[2] Univ Evry Val dEssonne, Dept Chim, F-91025 Evry, France

[3] Ctr Natl Etud Spatiales, F-31401 Toulouse 9, France

来源：

ELECTROCHIMICA ACTA | 2011年 / 56卷 / 27期

关键词：

Lithium batteries; Rutile beta-MnO2; Nanomaterial; Li transport; Electrochemical impedance; POSITIVE ELECTRODE; TIO2; LI; ELECTROACTIVITY; DIFFUSION;

D O I：

10.1016/j.electacta.2011.08.118

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The kinetics of the electrochemical lithium insertion reaction in nano-sized rutile beta-MnO2 has been investigated using ac impedance spectroscopy. The experimental kinetic data are obtained for a rutile compound synthesized by ball-milling the powder produced from the heat treatment of manganese nitrate salts. The results are discussed as a function of the Li content for 0 < x < 0.6 and the number of cycles in the 4.1-2V window. From a comparison with data obtained on the micro-sized oxide, an improved kinetics is found with D-Li values for the apparent chemical diffusion coefficient of lithium much higher by one order of magnitude than in microsized oxide. Impedance behaviour of the ball-milled rutile beta-MnO2 vs cycles demonstrates a new system takes place from the second cycle, characterized by a significant improvement of Li diffusion by a factor 5 and a cathode impedance which decreases by a factor 2, remaining thereafter unchanged during cycling. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：10016 / 10022

页数：7

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