Application of In Operando UV/Vis Spectroscopy in Lithium-Sulfur Batteries

被引：123

作者：

Patel, Manu U. M. ^{[1
]}

Dominko, Robert ^{[1
]}

机构：

[1] Natl Inst Chem, Lab Mat Chem, SI-1000 Ljubljana, Slovenia

来源：

CHEMSUSCHEM | 2014年 / 7卷 / 08期

关键词：

electrochemistry; lithium; polymers; sulfur; UV/Vis spectroscopy; LI-S BATTERIES; X-RAY-DIFFRACTION; IN-SITU; LIQUID ELECTROLYTE; POLYSULFIDES; PERFORMANCE; CATHODE; IDENTIFICATION; MECHANISM; CELLS;

D O I：

10.1002/cssc.201402215

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Application of UV/Vis spectroscopy for the qualitative and quantitative determination of differences in the mechanism of lithium-sulfur battery behavior is presented. With the help of catholytes prepared from chemically synthesized stoichiometric mixtures of lithium and sulfur, calibration curves for two different types of electrolyte can be constructed. First-order derivatives of UV/Vis spectra show five typical derivative peak positions in both electrolytes. In operando measurements show a smooth change in the UV/Vis spectra in the wavelength region between lambda = 650 and 400 nm. Derivatives are in agreement with derivative peak positions observed with catholytes. Recalculation of normalized reflections of UV/Vis spectra obtained in operando mode enable the formation of polysulfides and their concentrations to be followed. In such a way, it is possible to distinguish differences in the mechanism of polysulfide shuttling between two electrolytes and to correlate differences in capacity fading.

引用

页码：2167 / 2175

页数：9

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