Supramolecular Functionalities Influence the Thermal Properties, Interactions and Conductivity Behavior of Poly(ethylene glycol)/LiAsF6 Blends

Polymers

Jui-Hsu Wang¹  Chih-Chia Cheng¹  Oleksii Altukhov²  Feng-Chih Chang¹ 

[1] Institute of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan; E-Mails:;Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 804, Taiwan; E-Mail:

关键词: supramolecular structure;    multiple hydrogen bonding;    polymer electrolytes;   

DOI  :  10.3390/polym5030937

来源: mdpi

【 摘 要 】

In this study, we tethered terminal uracil groups onto short-chain poly(ethylene glycol) (PEG) to form the polymers, uracil (U)-PEG and U-PEG-U. Through AC impedance measurements, we found that the conductivities of these polymers increased upon increasing the content of the lithium salt, LiAsF₆, until the Li-to-PEG ratio reached 1:4, with the conductivities of the LiAsF₆/U-PEG blends being greater than those of the LiAsF₆/U-PEG-U blends. The ionic conductivity of the LiAsF₆/U-PEG system reached as high as 7.81 × 10⁻⁴ S/cm at 30 °C. Differential scanning calorimetry, wide-angle X-ray scattering, ⁷Li nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy revealed that the presence of the uracil groups in the solid state electrolytes had a critical role in tuning the glass transition temperatures and facilitating the transfer of Li⁺ ions.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.