TY - JOUR
T1 - Supported Ionic Liquid Gel Membrane Electrolytes for Flexible Supercapacitors
AU - Zhang, Xiaomin
AU - Kar, Mega
AU - Mendes, Tiago C.
AU - Wu, Youting
AU - Macfarlane, Douglas R.
PY - 2018/5/25
Y1 - 2018/5/25
N2 - In this work, a novel and easy-to-use methodology is developed to prepare supported ionic liquid gel membranes (SILGMs) by incorporating ionogels into commercial porous supports, to use as both electrolytes and separators for supercapacitors. Macroscopic sol-gel transition temperature, Fourier transform infrared spectra, and thermal behaviors of the ionogels are systematically investigated. Ionic conductivities of the ionogels and SILGMs are measured from 25 to 100 °C. The ionic conductivities of the ionogels are lower by one order of magnitude once they are incorporated into the supports. Nonetheless, the ionic conductivity of the SILGMs has reached the practical application level required for energy storage and conversion devices. Furthermore, the stability and flexibility of SILGMs are investigated as flexible electrolytes for supercapacitor devices (see Video in the Supporting Information). Charge-discharge cycling of symmetric supercapacitors based on the SILGMs reveal specific capacitance as high as 153 F g-1 at 0.1 A g-1, and remain at 101 F g-1 at 10 A g-1. The capacitance retention after 10 000 charge-discharge cycles at 5.0 A g-1 is as high as 97%, demonstrating excellent cycle stability of the device. The studies suggest that SILGMs are promising candidates for stable, high performance, and flexible energy storage and conversion devices that could be made by high volume roll-to-roll processing.
AB - In this work, a novel and easy-to-use methodology is developed to prepare supported ionic liquid gel membranes (SILGMs) by incorporating ionogels into commercial porous supports, to use as both electrolytes and separators for supercapacitors. Macroscopic sol-gel transition temperature, Fourier transform infrared spectra, and thermal behaviors of the ionogels are systematically investigated. Ionic conductivities of the ionogels and SILGMs are measured from 25 to 100 °C. The ionic conductivities of the ionogels are lower by one order of magnitude once they are incorporated into the supports. Nonetheless, the ionic conductivity of the SILGMs has reached the practical application level required for energy storage and conversion devices. Furthermore, the stability and flexibility of SILGMs are investigated as flexible electrolytes for supercapacitor devices (see Video in the Supporting Information). Charge-discharge cycling of symmetric supercapacitors based on the SILGMs reveal specific capacitance as high as 153 F g-1 at 0.1 A g-1, and remain at 101 F g-1 at 10 A g-1. The capacitance retention after 10 000 charge-discharge cycles at 5.0 A g-1 is as high as 97%, demonstrating excellent cycle stability of the device. The studies suggest that SILGMs are promising candidates for stable, high performance, and flexible energy storage and conversion devices that could be made by high volume roll-to-roll processing.
KW - Electrolytes
KW - Flexible supercapacitor
KW - Gels
KW - Ionic liquids
KW - Membranes
UR - http://www.scopus.com/inward/record.url?scp=85041193395&partnerID=8YFLogxK
U2 - 10.1002/aenm.201702702
DO - 10.1002/aenm.201702702
M3 - Article
AN - SCOPUS:85041193395
VL - 8
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6840
IS - 15
M1 - 1702702
ER -