Determination of the diffusion coefficient of lithium ions in nano-Si

被引：515

作者：

Ding, N. ^{[1
,2
]}

Xu, J. ^{[1
]}

Yao, Y. X. ^{[1
]}

Wegner, G. ^{[2
]}

Fang, X. ^{[1
]}

Chen, C. H. ^{[1
]}

Lieberwirth, I. ^{[2
]}

机构：

[1] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China

[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

SOLID STATE IONICS | 2009年 / 180卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

Lithium diffusion; Silicon; Impedance spectroscopy; Galvanostatic intermittent titration; Li-ion battery; X-RAY-DIFFRACTION; CARBON-COATED SILICON; AMORPHOUS-SILICON; ROOM-TEMPERATURE; THIN-FILMS; BATTERIES; LI; ANODE; INTERCALATION; ELECTRODES;

D O I：

10.1016/j.ssi.2008.12.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The diffusion coefficients of lithium ions (DLi+) in nano-Si were determined by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT). DLi+ values are estimated to be similar to 10(-12) cm(2) s(-1) and exhibit a "W" type varying with the lithium concentration in silicon. Two minimum regions of DLi+ (at Li2.1+0.2 Si and Li3.2 +/- 0.2Si) are found, which probably result from two amorphous compositions (a-Li7Si3 and a-Li13Si4). Besides the two minimum regions, one maximum DLi+ is observed at Li15Si4, corresponding to the crystallization of highly lithiated amorphous LixSi. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：222 / 225

页数：4

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