Liquid perfluoropolyether electrolytes with enhanced ionic conductivity for lithium battery applications

POLYMER

卷:100

Article

Olson, Kevin R.¹  Wong, Dominica H. C.^1,7  Chintapalli, Mahati²  Timachova, Ksenia³  Janusziewicz, Rima¹  Daniel, William F. M.¹  Mecham, Sue¹  Sheiko, Sergei¹  Balsara, Nitash P.^3,4,5  DeSimone, Joseph M.^1,6 

[1] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA

[2] Univ Calif Berkeley, Mat Sci & Engn Dept, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA

[4] Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

[5] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[6] North Carolina State Univ, Dept Chem & Biomol Engn, Raleigh, NC 27695 USA

[7] Eastman Chem Co, Polymers Dev Lab, Kingsport, TN 37660 USA

关键词: Perfluoropolyether;    Electrolyte;    Battery;   

DOI  :  10.1016/j.polymer.2016.08.020

来源: Elsevier

【 摘 要 】

We prepared nonflammable liquid polymer electrolytes for lithium-ion batteries by mixing ethoxylated perfluoropolyethers (PFPEs) with LiN(SO2CF3)(2) salt. Interestingly, we identified the presence of chain coupling in the PFPE polymers and their functionalized derivatives, resulting in a mixture of PFPEs with varying molecular weights. The distribution of molecular weights, along with PFPE's multiple functionalities, allows systematic manipulation of structure to enhance electrochemical and physical properties. Furthermore, the electrolytes exhibited a wide thermal stability window (5% degradation temperature >180 degrees C). Despite substantial increases in viscosity upon loading the PFPEs with lithium salt, the conductivity (sigma approximate to 5 x 10(-5) S cm(-1) at 28 degrees C) of the novel electrolytes was about an order of magnitude higher than that of our previously reported PFPE electrolytes. Ethoxylated derivatives of PFPE electrolytes exhibit elevated conductivity compared to non-ethoxylated derivatives, demonstrating our capability to enhance the conductive properties of the PFPE platform by attaching various functional groups to the polymer backbone. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free