Aqueous aluminum-ion batteries(AIBs)are promising candidates for large-scale energy storage due to the abundant resource reserve,high theoretical capacity,intrinsic safety,and low cost of Al.However,the development of...Aqueous aluminum-ion batteries(AIBs)are promising candidates for large-scale energy storage due to the abundant resource reserve,high theoretical capacity,intrinsic safety,and low cost of Al.However,the development of aqueous AIBs is constrained by the inefficient Al plating,inevitable parasitic side reactions,and the collapse of the cathode materials.Herein,we propose a novel Al^(3+)/Mn^(2+)hybrid electrolyte in a water-acetonitrile co-solvent system with a regulated solvation structure to realize cathode-free AIBs.The inclusion of acetonitrile as a co-solvent plays a crucial role in reducing the desolvation energy and suppressing side reactions.The introduction of Mn^(2+)can enable the reversible plating/stripping of Al-Mn alloy with reduced overpotentials on the anode and deposition/stripping of Al_(x)MnO_(2) on the cathodic current collector to realize cathode-free AIBs.The architected AIB delivers a high discharge capacity of 397.9 mAh g^(-1),coupled with superior rate capability and stable cycling performance.Moreover,the cathode-free AIB shows superior low-temperature performance and can operate at-20℃ for over 120 cycles.This work provides new ideas for developing high-performance and low-cost aqueous AIBs.展开更多
The environment benignity and battery cost are major concerns for grid-scale energy storage applications.The emerging dendrite-free Fe-ion aqueous batteries are promising due to the rich natural abundance,low cost and...The environment benignity and battery cost are major concerns for grid-scale energy storage applications.The emerging dendrite-free Fe-ion aqueous batteries are promising due to the rich natural abundance,low cost and non-toxicity for Fe resources.However,serious passivation reactions on Fe anodes and poor long-term cyclability for matched cathodes still stand in the way for their practical usage.To settle above constraints,we herein use NH_(4)Cl as the electrolyte regulator to elevate the reaction kinetics of passivated Fe anodes,and also propose a special cathode-free design to prolong the cells lifetime over 1,000 cycles.The added NH_(4)Cl can erode/break inert passivation layers and strengthen the ion conductivity of electrolytes,facilitating the reversible Fe plating/stripping and Fe^(2+)shuttling.The highly puffed nano carbon foams function as current collectors and actives anchoring hosts,enabling expedite Fe^(2+)adsorption/desorption,FeII/FeIII redox conversions and FeIII deposition.The configured rocking-chair Fe-ion cells have good environmental benignity and decent energy-storage behaviors,including high reactivity/reversibility,outstanding cyclic stability and far enhanced operation longevity.Such economical,long-cyclic and green cathode-free Fe-ion batteries may hold great potential in near-future energy-storage power stations.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52274302)。
文摘Aqueous aluminum-ion batteries(AIBs)are promising candidates for large-scale energy storage due to the abundant resource reserve,high theoretical capacity,intrinsic safety,and low cost of Al.However,the development of aqueous AIBs is constrained by the inefficient Al plating,inevitable parasitic side reactions,and the collapse of the cathode materials.Herein,we propose a novel Al^(3+)/Mn^(2+)hybrid electrolyte in a water-acetonitrile co-solvent system with a regulated solvation structure to realize cathode-free AIBs.The inclusion of acetonitrile as a co-solvent plays a crucial role in reducing the desolvation energy and suppressing side reactions.The introduction of Mn^(2+)can enable the reversible plating/stripping of Al-Mn alloy with reduced overpotentials on the anode and deposition/stripping of Al_(x)MnO_(2) on the cathodic current collector to realize cathode-free AIBs.The architected AIB delivers a high discharge capacity of 397.9 mAh g^(-1),coupled with superior rate capability and stable cycling performance.Moreover,the cathode-free AIB shows superior low-temperature performance and can operate at-20℃ for over 120 cycles.This work provides new ideas for developing high-performance and low-cost aqueous AIBs.
基金This work is financially supported by the National Natural Science Foundation of China(No.51802269)Fundamental Research Funds for the Central Universities(Nos.XDJK2020C057 and SYJ2021011)Venture&Innovation Support Program for Chongqing overseas returnees(cx2018027).
文摘The environment benignity and battery cost are major concerns for grid-scale energy storage applications.The emerging dendrite-free Fe-ion aqueous batteries are promising due to the rich natural abundance,low cost and non-toxicity for Fe resources.However,serious passivation reactions on Fe anodes and poor long-term cyclability for matched cathodes still stand in the way for their practical usage.To settle above constraints,we herein use NH_(4)Cl as the electrolyte regulator to elevate the reaction kinetics of passivated Fe anodes,and also propose a special cathode-free design to prolong the cells lifetime over 1,000 cycles.The added NH_(4)Cl can erode/break inert passivation layers and strengthen the ion conductivity of electrolytes,facilitating the reversible Fe plating/stripping and Fe^(2+)shuttling.The highly puffed nano carbon foams function as current collectors and actives anchoring hosts,enabling expedite Fe^(2+)adsorption/desorption,FeII/FeIII redox conversions and FeIII deposition.The configured rocking-chair Fe-ion cells have good environmental benignity and decent energy-storage behaviors,including high reactivity/reversibility,outstanding cyclic stability and far enhanced operation longevity.Such economical,long-cyclic and green cathode-free Fe-ion batteries may hold great potential in near-future energy-storage power stations.
