5 years ago

Li2SO4-polyacrylamide polymer electrolytes for 2.0V solid symmetric supercapacitors

Li2SO4-polyacrylamide polymer electrolytes for 2.0V solid symmetric supercapacitors
A neutral polymer electrolyte comprised of lithium sulfate (Li2SO4) and polyacrylamide (PAM) was developed. The Li2SO4-PAM electrolyte film shows an ionic conductivity up to 10mScm1 in 45%RH conditions. Solid double layer capacitors were demonstrated using CNT-graphite electrodes and Li2SO4-PAM solid electrolytes. The voltage window of the solid cell was about 2.0V, identical to that of a Li2SO4 liquid cell used as baseline. The demonstrated voltage window is significantly larger than that reported for proton- or hydroxyl-conducting electrolytes, suggesting that the Li2SO4-PAM electrolyte is a promising system for high energy density supercapacitors. The solid device also demonstrated excellent rate capability (up to 5Vs1) and good cycle life (beyond 10,000charge/discharge cycles).

Publisher URL: www.sciencedirect.com/science

DOI: S1388248117301571

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