Aqueous zinc-ion batteries have already shown promising prospects in electronic devices,owing to their environmentally benign nature and high safety.Manganese dioxide is studied as one kind of cathode material,however...Aqueous zinc-ion batteries have already shown promising prospects in electronic devices,owing to their environmentally benign nature and high safety.Manganese dioxide is studied as one kind of cathode material,however,it typically displays slow kinetics and unstable crystal structures.Defect engineering introduces active sites in MnO_(2),while metal ion doping increases material's molar mass,which offers rare zinc storage contribution.To find a feasible doping strategy with optimized oxygen vacancies is highly desirable.Herein,the incorporation of nitrogen-doped MnO_(2)(NMO)with lower electronegativity as the cathode enabled the realization of reversible aqueous zinc-ion batteries.The structural stability and electrochemical properties of NMO were enhanced by nitrogen doping.NMO exhibited a smaller charge transfer resistance than pristine MnO_(2)(279.6Ωvs.484.5Ω).Cyclic voltammetry curves displayed that the incorporation of nitrogen doping could decrease the polarization,which provided a good basis for optimizing electrode kinetics.Specifically,the battery displayed a promising specific discharge capacity of 153.1 mAh·g^(-1)at 0.5 A·g^(-1)after 100 cycles.And at the current density of 1 A·g^(-1),the capacity retention of NMO after 1600 cycles was 1.72 times that of pristine MnO_(2).This study proposed a feasible idea for modifying non-metal hole sites in the cathode materials of zinc-based batteries,providing deep insights for future practical application of energy storage systems.展开更多
基金supported by the following funding programs:Natural Science Research Project of Jiangsu Higher Education Institutions of China(23KJB430029)the National Natural Science Foundation of China(52402198)+1 种基金Jiangsu Provincial Department of Science and Technology(BK20240821 and BK20232041)International Joint Laboratory on Low-Dimensional Optoelectronic Materials and Devices of Soochow University and Suzhou Foreign Academician Workstation.
文摘Aqueous zinc-ion batteries have already shown promising prospects in electronic devices,owing to their environmentally benign nature and high safety.Manganese dioxide is studied as one kind of cathode material,however,it typically displays slow kinetics and unstable crystal structures.Defect engineering introduces active sites in MnO_(2),while metal ion doping increases material's molar mass,which offers rare zinc storage contribution.To find a feasible doping strategy with optimized oxygen vacancies is highly desirable.Herein,the incorporation of nitrogen-doped MnO_(2)(NMO)with lower electronegativity as the cathode enabled the realization of reversible aqueous zinc-ion batteries.The structural stability and electrochemical properties of NMO were enhanced by nitrogen doping.NMO exhibited a smaller charge transfer resistance than pristine MnO_(2)(279.6Ωvs.484.5Ω).Cyclic voltammetry curves displayed that the incorporation of nitrogen doping could decrease the polarization,which provided a good basis for optimizing electrode kinetics.Specifically,the battery displayed a promising specific discharge capacity of 153.1 mAh·g^(-1)at 0.5 A·g^(-1)after 100 cycles.And at the current density of 1 A·g^(-1),the capacity retention of NMO after 1600 cycles was 1.72 times that of pristine MnO_(2).This study proposed a feasible idea for modifying non-metal hole sites in the cathode materials of zinc-based batteries,providing deep insights for future practical application of energy storage systems.
