期刊
ENERGY STORAGE MATERIALS
卷 25, 期 -, 页码 70-75出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.10.030
关键词
Cellulose; Dual networked gel; Ionic liquid; Renewable energy storage; Flexible energy storage
资金
- Energy Technology Development Project (ETDP) - Ministry of Trade, Industry and Energy [20172410100150]
- R&D Convergence Program of the National Research Council of Science & Technology, Republic of Korea [CAP-15-02-KBSI]
A renewable cellulose-based dual network ionogel electrolyte is synthesized by phosphorylating and dissolving a microcrystalline cellulose network in a tailor-made 1,3-dimethylimidazolium methyl phosphite [DMIM] [MeO(H) PO3] ionic liquid mixture, with subsequent polymerization of the 2-hydroxyethyl methacrylate monomer in the presence of a cellulose network. The as-synthesized ionogel electrolytes exhibit high ionic conductivity (2.6-22.4 mS cm(-1)) over a wide temperature range (30-120 degrees C), with a maximum toughness of 1.46 MJ m(-3) at 30 degrees C. A renewable flexible supercapacitor is fabricated by sandwiching the cellulose-based ionogel electrolyte between two activated carbon electrodes, delivering high specific capacitance and rate capability of 174 F g(-1) and 88% at 120 degrees C at a cell voltage of 2.5 V. These remarkable capacitive features at elevated temperature are associated with fast dynamics, facilitated by thermally activated ion transport, as demonstrated by the Vogel-Tammann-Fulcher and Nyquist plots.
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