The Reaction of Charged Cathodes with Nonaqueous Solvents and Electrolytes: II. LiMn[sub 2]O[sub 4] charged to 4.2 V
Open Access
- 1 January 2001
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 148 (11) , A1211-A1215
- https://doi.org/10.1149/1.1407246
Abstract
The thermal decomposition of LiMn2O4LiMn2O4 charged to 4.2 V was studied using a combination of accelerating rate calorimetry and X-ray diffraction. The electrolyte and solvent were removed from the surface of the electrode using a rinsing procedure. Then electrode samples were either heated dry with solvent added or with electrolyte added. The dry electrode was determined to convert from the λMnO2λMnO2 structure to the βMnO2βMnO2 structure upon exposure to elevated temperatures (below 300°C). In the presence of solvent, there is solvent oxidation and reduction to MnO. The reaction of LixMn2O4LixMn2O4 with xMxM LiPF6/EC:DECLiPF6/EC:DEC (0<x<1.5)(0LiMn2O4,LiMn2O4, since electrodes in electrolytes with lower concentrations of LiPF6LiPF6 than, for example, 1 M, demonstrate improved thermal behavior. © 2001 The Electrochemical Society. All rights reserved.Keywords
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