In-Situ Raman Investigation of Polysulfide Formation in Li-S Cells

被引：324

作者：

Hagen, M. ^{[1
]}

Schiffels, P. ^{[2
]}

Hammer, M. ^{[1
]}

Doerfler, S. ^{[3
]}

Tuebke, J. ^{[1
]}

Hoffmann, M. J. ^{[4
]}

Althues, H. ^{[3
]}

Kaskel, S. ^{[3
]}

机构：

[1] Fraunhofer Inst Chem Technol ICT, D-76327 Pfinztal, Germany

[2] Fraunhofer Inst Mfg Technol & Adv Mat IFAM, D-28359 Bremen, Germany

[3] Fraunhofer Inst Mat & Beam Technol IWS, D-01277 Dresden, Germany

[4] KIT, Inst Appl Mat Ceram Mech Engn, D-76131 Karlsruhe, Germany

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2013年 / 160卷 / 08期

关键词：

SULFUR-CONTAINING ANIONS; CARBON NANOTUBES COMPOSITE; INORGANIC POLYSULFIDES; ELECTROCHEMICAL REDUCTION; CATHODE MATERIAL; RADICAL-ANIONS; ALKALI POLYSULFIDES; BLUE SOLUTIONS; LITHIUM; DIMETHYLFORMAMIDE;

D O I：

10.1149/2.045308jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

To obtain information about the Li-S reaction mechanism through spectroscopy, a Raman literature study, polysulfide vibrational mode calculations and experimental in-situ measurements were performed. A special test cell was constructed to examine in-situ Raman spectra in the spectral range from 100 cm(-1) to 600 cm(-1) during charge and discharge in the voltage range of 1.5 V to 3.0 V. In order to assign the in-situ Raman data and to support the interpretation of the observed changes in the overall Raman-spectrum, several reference measurements on well-defined substances were conducted. The reference measurements included pure solvents, electrolytes and polysulfide solutions prepared from stoichiometric mixtures of S-8 and Li2S powders. The assignment of the observed Raman-spectra was further based on a comparison with purely theoretical data for the vibrational modes of the polysulfide di-anions S-n(2-) and radical mono-anions S-n(-) calculated at the B3PW91/6-311G(2df,p) level of density functional theory (DFT). The DFT data for the vibrational spectra, corrected for solvent effects in the framework of the polarizable continuum model (PCM), allowed an identification of several characteristic features in the in-situ Raman spectra. (C) 2013 The Electrochemical Society.

引用

页码：A1205 / A1214

页数：10

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