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Ion-conducting lithium bis(oxalato)borate-based polymer electrolytes

✍ Scribed by Jakub Reiter; Robert Dominko; Martina Nádherná; Ivo Jakubec

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
354 KB
Volume
189
Category
Article
ISSN
0378-7753

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✦ Synopsis

Poly(2-ethoxyethyl methacrylate) polymer gel electrolytes containing immobilised lithium bis(oxalato)borate in aprotic carbonates: propylene carbonate (PC), propylene carbonate-ethylene carbonate (PC-EC 50:50 vol.%) and diethyl carbonate-ethylene carbonate (DEC-EC 50:50 vol.%) were prepared by a direct radical polymerisation. The electrolyte composition was optimised to achieve suitable ionic conductivity 0.5 and 2.4 mS cm -1 at 25 and 70 • C respectively along with good mechanical properties. The electrochemical stability up to 5.1 V vs. Li/Li + was determined on gold electrode by voltammetrical measurements. The polymer electrolytes with high-boiling solvents (PC and PC/EC) showed higher thermal stability (up to 110-120 • C) compared to the liquid electrolytes. The proposed area of application is in the lithium-ion batteries with cathodes operating at elevated temperatures of 70 • C, where higher electrochemical stability of the polymer electrolytes is employed.

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