Achieving high-performance aqueous zinc-ion batteries requires addressing the challenges associated with the stability of zinc metal anodes,particularly the formation of inhomogeneous zinc dendrites during cycling and...Achieving high-performance aqueous zinc-ion batteries requires addressing the challenges associated with the stability of zinc metal anodes,particularly the formation of inhomogeneous zinc dendrites during cycling and unstable surface electrochemistry.This study introduces a practical method for scattering untreated bulk hexagonal boron nitride(h-BN)particles onto the zinc anode surface.During cycling,stabilized zinc fills the interstices of scattered h-BN,resulting in a more favorable(002)orientation.Consequently,zinc dendrite formation is effectively suppressed,leading to improved electrochemical stability.The zinc with scattered h-BN in a symmetric cell configuration maintains stability 10 times longer than the bare zinc symmetric cell,lasting 500 hours.Furthermore,in a full cell configuration withα-MnO_(2) cathode,increased H^(+)ion activity can effectively alter the major redox kinetics of cycling due to the presence of scattered h-BN on the zinc anode.This shift in H^(+)ion activity lowers the overall redox potential,resulting in a discharge capacity retention of 96.1%for 300 cycles at a charge/discharge rate of 0.5 Ag^(-1).This study highlights the crucial role of surface modification,and the innovative use of bulk h-BN provides a practical and effective solution for improving the performance and stability.展开更多
基金supported by the Korean Institute of Energy Technology Evaluation and Planning(KETEP)grant funded by the Korea Government(MOTIE)(RS-2023-00303581,Multiscale Simulation-Driven Development of Cost-Effective and Stable Aqueous Zn Ion Battery with Energy Density of 110 Wh/L for Energy Storage Systems:A Korea-USA Collaboration)。
文摘Achieving high-performance aqueous zinc-ion batteries requires addressing the challenges associated with the stability of zinc metal anodes,particularly the formation of inhomogeneous zinc dendrites during cycling and unstable surface electrochemistry.This study introduces a practical method for scattering untreated bulk hexagonal boron nitride(h-BN)particles onto the zinc anode surface.During cycling,stabilized zinc fills the interstices of scattered h-BN,resulting in a more favorable(002)orientation.Consequently,zinc dendrite formation is effectively suppressed,leading to improved electrochemical stability.The zinc with scattered h-BN in a symmetric cell configuration maintains stability 10 times longer than the bare zinc symmetric cell,lasting 500 hours.Furthermore,in a full cell configuration withα-MnO_(2) cathode,increased H^(+)ion activity can effectively alter the major redox kinetics of cycling due to the presence of scattered h-BN on the zinc anode.This shift in H^(+)ion activity lowers the overall redox potential,resulting in a discharge capacity retention of 96.1%for 300 cycles at a charge/discharge rate of 0.5 Ag^(-1).This study highlights the crucial role of surface modification,and the innovative use of bulk h-BN provides a practical and effective solution for improving the performance and stability.
