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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 10mScm−1 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...
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