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Abstract

Formation process for a potassium-ion hybrid supercapacitor, the process comprising:

a) supplying the potassium-ion hybrid supercapacitor comprising: a negative electrode comprising graphite,a positive electrode comprising activated carbon,an electrolyte comprising a potassium salt, b) charging the supercapacitor at constant current in a protocol of between Cx/50 and Cx/2, to a charge cutoff voltage of between 3.0 V and 3.3 V,c) holding the supercapacitor at the charge cutoff voltage until the leakage current is between Cx/2000 and Cx/500,d) discharging the supercapacitor at constant current in a protocol of between Cx/50 and Cx, to a discharge cutoff voltage of between 0 V and 2 V,where the process further comprises degassing the supercapacitor after one of steps b) to d).

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First Claim