Recently,aqueous zinc ion batteries(AZIBs)have emerged as novel energy storage devices for their low cost,favorable safety and high theoretical capacity.However,layered ammonium vanadates,as promising cathode material...Recently,aqueous zinc ion batteries(AZIBs)have emerged as novel energy storage devices for their low cost,favorable safety and high theoretical capacity.However,layered ammonium vanadates,as promising cathode materials,suffer from slow Zn^(2+)diffusion kinetics due to the strong electrostatic interactions between Zn^(2+)and the[VOn]layer,irreversible deammoniation and poor conductivity.In this work,Ag^(+)intercalated NH_(4)V_(4)O_(10)(ANVO)was synthesized as a high-performance cathode for AZIBs.The pre-intercalated Ag^(+)interacts with the lattice oxygen to form strong Ag-O bonds,acting as“pillars”to stabilize the layered structure in electrochemical reactions.Moreover,the Ag0 generated in situ during the discharge process favors enhancement of the electronic conductivity of the material.The dual effects of Ag^(+)intercalation endow AVNO with high structural stability and fast electron/Zn^(2+)diffusion kinetics,leading to superior electrochemical performance.In particular,it exhibits an ultralong cycling life(with 95%capacity retention after 1000 cycles at 5 A g^(-1))as well as competitive rate performance(473.6 mA h g^(-1) at 0.2 A g^(-1) and 286.6 mA h g^(-1) at 10 A g^(-1)).This research provides valuable insights for designing high-capacity and long-life cathode materials.展开更多
基金supported by the Natural Science Foundation of Sichuan Province(2022NSFSC1212).
文摘Recently,aqueous zinc ion batteries(AZIBs)have emerged as novel energy storage devices for their low cost,favorable safety and high theoretical capacity.However,layered ammonium vanadates,as promising cathode materials,suffer from slow Zn^(2+)diffusion kinetics due to the strong electrostatic interactions between Zn^(2+)and the[VOn]layer,irreversible deammoniation and poor conductivity.In this work,Ag^(+)intercalated NH_(4)V_(4)O_(10)(ANVO)was synthesized as a high-performance cathode for AZIBs.The pre-intercalated Ag^(+)interacts with the lattice oxygen to form strong Ag-O bonds,acting as“pillars”to stabilize the layered structure in electrochemical reactions.Moreover,the Ag0 generated in situ during the discharge process favors enhancement of the electronic conductivity of the material.The dual effects of Ag^(+)intercalation endow AVNO with high structural stability and fast electron/Zn^(2+)diffusion kinetics,leading to superior electrochemical performance.In particular,it exhibits an ultralong cycling life(with 95%capacity retention after 1000 cycles at 5 A g^(-1))as well as competitive rate performance(473.6 mA h g^(-1) at 0.2 A g^(-1) and 286.6 mA h g^(-1) at 10 A g^(-1)).This research provides valuable insights for designing high-capacity and long-life cathode materials.
