Novel deep eutectic solvent-based on lithium bis(fluorosulfonyl)imide and acetamide as high-performance electrolytes for 3.0 V asymmetric supercapacitor
Issued Date
2022-09-01
Resource Type
eISSN
2352152X
Scopus ID
2-s2.0-85132916236
Journal Title
Journal of Energy Storage
Volume
53
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Energy Storage Vol.53 (2022)
Suggested Citation
Truong T.T.T., Le L.T.M., Nguyen H.V., Nguyen Q.D., Tran M.V., Phung Q., Pakawatpanurut P., Nguyen A.T., Nguyen T.T., Garg A., Le P.M.L. Novel deep eutectic solvent-based on lithium bis(fluorosulfonyl)imide and acetamide as high-performance electrolytes for 3.0 V asymmetric supercapacitor. Journal of Energy Storage Vol.53 (2022). doi:10.1016/j.est.2022.105088 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/84551
Title
Novel deep eutectic solvent-based on lithium bis(fluorosulfonyl)imide and acetamide as high-performance electrolytes for 3.0 V asymmetric supercapacitor
Other Contributor(s)
Abstract
This paper illustrates the synthesis and physical characterization of a novel deep eutectic solvent consisting of lithium bis(fluorosulfonyl)imide (LiFSI) and acetamide (Ace) as a suitable electrolyte for supercapacitor. The formation of DES is finally pronounced in a liquid state at room temperature with a suitable molar ratio of LiFSI: Ace = 1:5(DES 1:5). Theoretical calculation confirmed DES structure formed through H-bond due to the strong interactions between –CO and –NH group of Ace precursors with Li+ and FSI− ions of lithium salt. As-synthesized DES exhibited high electrochemical stability (~5.0 V vs. Li+/Li), good thermal stability (~200 °C), and high ionic conductivity up to 1.97 mS·cm−1 at 30 °C. Different diluents such as ethylene carbonate (EC) and bis(2,2,2-trifluoromethyl) ether (BTFE) were used in a small amount to combine with pristine DES 1:5 so as to lower its viscosity and maintain its original features. DES-BTFE hybrid electrolytes mixture could significantly enhance the cycling performance at room temperature and improve cell safety at high temperatures. In EDLC capacitors, the hybrid electrolyte with DES-10%wt. BTFE displays capacitance of 23 F/g (1 A·g−1) corresponding to the energy density of 103.2 Wh·kg−1 at operating voltage 3.0 V and remains ~99.0% after 1000 cycles. In addition, our asymmetric capacitor device was successfully fabricated using MnO2 as a positive electrode and active carbon (AC) as a negative electrode in DES-based electrolytes. The asymmetric supercapacitor could be reversibly cycled in a wide potential window of 0–3.0 V and exhibits an energy density of 74.79 Wh·kg −1 with retention of 68.3% after 2000 cycles in DES (1:5) +10 %wt. BTFE.