Electrochemical Performance of Solid Polymer Electrolyte PEO20-LiTf-Urea1.5

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (3): 478-481.

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Electrochemical Performance of Solid Polymer Electrolyte PEO20-LiTf-Urea1.5

ZHANG Ding, YAN Hui, ZHANG Huan and QI Lu*

Beijing National Laboratory for Molecular Sciences, Institute of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received:2010-09-13 Revised:2010-11-25 Online:2011-05-25 Published:2011-04-29
Contact: QI Lu E-mail:qilu@pku.edu.cn
Supported by:
Supported by the National High Technology Research and Development Program of China(No.2008AA11A102).

Abstract

Abstract: A new solid polymer electrolyte PEO20-LiTf-Urea1.5 was prepared by solution casting technique. The energy of frontier orbitals for the components of the electrolyte was predicted by quantum chemistry calculations, and TG stability and electrochemical features were measured. Urea exhibited a lower HOMO energy than PEO, implying its enhanced stability against electrochemical oxidation. Experimentally addition of urea increases the ionic conductivity, which guarantees conductivity requirement for lithium ion batteries. It also results in significant improved electrochemical stability with good thermal stability. Favorable lithium stripping/plating performance is yielded, and it confirms the good stability of the solid electrolyte interphase for the PEO20-LiTf-Urea1.5 system.

Key words: Solid polymer electrolyte, Urea, Solution-casting technique

ZHANG Ding, YAN Hui, ZHANG Huan and QI Lu*. Electrochemical Performance of Solid Polymer Electrolyte PEO20-LiTf-Urea1.5[J]. Chemical Research in Chinese Universities, 2011, 27(3): 478-481.

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Electrochemical Performance of Solid Polymer Electrolyte PEO20-LiTf-Urea1.5

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