An effective'salt in dimethyl sulfoxide/water'electrolyte enables high-voltage supercapacitor operated at-50 ℃
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Compared with organic electrolytes,aqueous electrolytes exhibit significantly higher ionic conductivity and possess inherent safety features,showcasing unique advantages in supercapacitors.However,chal-lenges remain for low-salt aqueous electrolytes operating at high voltage and low temperature.Herein,we report a low-salt(0.87 m,m means mol kg-1)'salt in dimethyl sulfoxide/water'hybrid electrolyte with non-flammability via hybridizing aqueous electrolyte with an organic co-solvent of dimethyl sulfox-ide(hydrogen bond acceptor).As a result,the 0.87 m hybrid electrolyte exhibits enhanced electrochem-ical stability,a freezing temperature below-50 ℃,and an outstanding ionic conductivity of 0.52 mS cm-1 at-50 ℃.Dimethyl sulfoxide can anchor water molecules through intermolecular hydrogen bond interaction,effectively reinforcing the stability of water in the hybrid electrolyte.Furthermore,the interaction between dimethyl sulfoxide and water molecules diminishes the involvement of water in the generation of ordered ice crystals,finally facilitating the low-temperature performance of the hybrid electrolyte.When paired with the 0.87 m'salt in dimethyl sulfoxide/water'hybrid electrolyte,the symmetric supercapacitor presents a 2.0 V high operating voltage at 25 ℃,and can operate stably at-50 ℃.Importantly,the suppressed electrochemical reaction of water at-50 ℃ further leads to the symmetric supercapacitor operated at a higher voltage of 2.6 V.This modification strategy opens an effec-tive avenue to develop low-salt electrolytes for high-voltage and low-temperature aqueous supercapacitors.
State Key Lab of Fine Chemicals,Frontier Science Center for Smart Materials,School of Chemical Engineering,Liaoning Key Lab for Energy Materials and Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China
School of Chemistry,Frontier Science Center for Smart Materials,Liaoning Key Lab for Energy Materials and Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning China
College of Chemical Engineering,State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China
National Key R&D Program of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities
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