To address challenges related to the intermittency of renewable energy sources,aqueous potassium-ion batteries(AKIBs)are a promising and sustainable alternative to conventional systems for large-scale energy storage.T...To address challenges related to the intermittency of renewable energy sources,aqueous potassium-ion batteries(AKIBs)are a promising and sustainable alternative to conventional systems for large-scale energy storage.To enable their practical application,maximizing energy density and longevity while minimizing production and material costs is a key goal.In this work,we propose an AKIB consisting only of abundant and cost-efficient materials,which delivers a high energy density of more than 70 Wh kg^(-1).We combine simple strategies to stabilize the Mn-rich Prussian blue analog cathode by Fe-doping,improving the crystallinity,and tuning the electrolyte composition without employing expensive water-in-salt electrolytes.Using a mixed 2.5 M Ca(NO_(3))_(2)+1.5 M KNO_(3)electrolyte,we assemble a novel AKIB with a Fe-doped manganese hexacyanoferrate cathode and an organic poly(naphthalene-4-formylethylenediamine)anode.Besides a high energy density,the full cell delivers a specific capacity of approximately 60 mAhg^(-1),a power density of 5000 W kg^(-1),and 80% capacity retention after 600 cycles.展开更多
基金Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)under Germany’s Excellence Strategy-EXC 2089/1-390776260(e-conversion)for fundingfinancial support from TUM Innovation Network for Artificial Intelligence powered Multifunctional Material Design(ARTEMIS)。
文摘To address challenges related to the intermittency of renewable energy sources,aqueous potassium-ion batteries(AKIBs)are a promising and sustainable alternative to conventional systems for large-scale energy storage.To enable their practical application,maximizing energy density and longevity while minimizing production and material costs is a key goal.In this work,we propose an AKIB consisting only of abundant and cost-efficient materials,which delivers a high energy density of more than 70 Wh kg^(-1).We combine simple strategies to stabilize the Mn-rich Prussian blue analog cathode by Fe-doping,improving the crystallinity,and tuning the electrolyte composition without employing expensive water-in-salt electrolytes.Using a mixed 2.5 M Ca(NO_(3))_(2)+1.5 M KNO_(3)electrolyte,we assemble a novel AKIB with a Fe-doped manganese hexacyanoferrate cathode and an organic poly(naphthalene-4-formylethylenediamine)anode.Besides a high energy density,the full cell delivers a specific capacity of approximately 60 mAhg^(-1),a power density of 5000 W kg^(-1),and 80% capacity retention after 600 cycles.
