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5069404 
Journal Article 
Direct Detection of Manganese Ions in Organic Electrolyte by UV-vis Spectroscopy 
Zhao, L; Chenard, E; Capraz, OO; Sottos, NR; White, SR, SR 
2018 
1 
Journal of Electrochemical Society
ISSN: 0013-4651
EISSN: 1945-7111 
165 
2 
A345-A348 
WOS:000431786800045 
Lithium manganese oxide cathodes used in Li-ion batteries suffer from manganese dissolution and capacity fade. We present a new technique for directly measuring the manganese ion (Mn2+) concentration in a typical Li-ion carbonate electrolyte using 4-(2-pyridylazo) resorcinol (PAR) as a UV-vis probe. Chelation between PAR and Mn2+ ion induces a characteristic absorption peak where the peak intensity corresponds to Mn2+ ion concentration in the electrolyte. Electrochemical stability of the probe is verified by performing potential hold and cyclic voltammetry. The in situ characterization of Mn dissolution in a customized battery cell is performed during cyclic voltammetry. (C) 2018 The Electrochemical Society. 
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