With the ever-increasing demands of grid-scale energy storage,aqueous zinc-ion batteries(ZIBs)have garnered increasing attention around the world.However,limited Zn^(2+)host materials have hindered the commercializati...With the ever-increasing demands of grid-scale energy storage,aqueous zinc-ion batteries(ZIBs)have garnered increasing attention around the world.However,limited Zn^(2+)host materials have hindered the commercialization of ZIBs.Hence,Mo-V oxides with different phase structures(orth-,tri-,and tetra-MoVO)were precisely constructed to develop phase-dependent Mo-V oxide cathodes for Zn^(2+)storage in ZIBs.The open frameworks and varied tunnel structures formed a favorable alternative for achieving suitable Zn^(2+)diffusion kinetics.With optimized phase engineering,the high specific capacity of approximately 400 mA h g^(−1) and excellent cyclic stability of 1000 cycles were achieved with orth-MoVO as the cathode.The large amount of six-and seven-member rings in the orth-MoVO phase,which allow for alternative Zn^(2+)insertion,play a vital role in hosting Zn^(2+)ions reversibly.The proposed phase engineering strategy provides a new approach toward cathode design in ZIBs.展开更多
基金supported by Guangdong Natural Science Foundation(2019A1515010675)the Science and Technology Project of Shenzhen(JCYJ20180305125106329,KQJSCX20180328094001794)。
文摘With the ever-increasing demands of grid-scale energy storage,aqueous zinc-ion batteries(ZIBs)have garnered increasing attention around the world.However,limited Zn^(2+)host materials have hindered the commercialization of ZIBs.Hence,Mo-V oxides with different phase structures(orth-,tri-,and tetra-MoVO)were precisely constructed to develop phase-dependent Mo-V oxide cathodes for Zn^(2+)storage in ZIBs.The open frameworks and varied tunnel structures formed a favorable alternative for achieving suitable Zn^(2+)diffusion kinetics.With optimized phase engineering,the high specific capacity of approximately 400 mA h g^(−1) and excellent cyclic stability of 1000 cycles were achieved with orth-MoVO as the cathode.The large amount of six-and seven-member rings in the orth-MoVO phase,which allow for alternative Zn^(2+)insertion,play a vital role in hosting Zn^(2+)ions reversibly.The proposed phase engineering strategy provides a new approach toward cathode design in ZIBs.
