期刊
CARBOHYDRATE POLYMERS
卷 240, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116339
关键词
cellulose; copolymerionic liquid; polymer electrolyte lithium battery
资金
- Postgraduate Studies Office of the University of Tabriz
- Ministry of Science, Research and Technology of Iran
- Helmholtz Association
- German Ministry for Research and Education within the FestBatt project [03XP0175B]
Herein, a novel cellulose derivative has been synthesized and investigated as a nature-derived solid polymer electrolyte for lithium batteries. Cellulose is oxidized in a two-step process to dicarboxylic acid cellulose to allow for grafting low molecular weight poly(ethylene glycol) monomethyl ether (550 g mol(-1)) via Fischer-Speier esterification at the thus obtained carboxyl groups. The chemical structure of the synthesized materials is confirmed by Fourier-transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy as well as X-ray diffraction. Incorporating lithium bis(trifluoromethane-sulfonyl)imide (LiTFSI) as conducting salt and Nbutyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr(14)TFSI) ionic liquid as plasticizer results in the realization of an amorphous and solvent-free solid polymer electrolyte. These electrolyte membranes are characterized by high thermal and electrochemical stability and ionic conductivities of about 1x10(-5) S cm(-1) at 20 degrees C and 2.5x10(-4) S cm(-1) at 80 degrees C, which enables very stable lithium stripping and plating for more than 800 h.
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