Neutral Electrolytes for EDLCs

Interestingly, mild neutral electrolytes not only allow a selection of diverse current collectors, but also favor the development of some electrode materials such as deoxyribonucleic acid (DNA)-AC composite electrodes that cannot afford strongly acidic and basic electrolytes [196]. 

FIGURE 2.17 Comparison of molar conductivity (at 0.05 M) of SiWA salts and other common salts with the same counter cations. (Reprinted from Electrochimica Acta, 138, Gao, H., A. Virya, and K. Lian, Monovalent silicotungstate salts as electrolytes for electrochemical supercapacitors, 240-246, Copyright 2014, with permission from Elsevier.) 

To extend the operative temperature range to the lower temperature limit of EDLCs, Yin et al. [197] proposed the addition of antifreezing additives for aqueous electrolytes. The assembled EDLCs with methanol/water-concentrated NaC104 electrolytes exhibited improved energy and power densities at temperatures as low as -40°C compared to the NaC104 electrolyte. 

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