Aqueous rechargeable zinc-ion batteries(ARZIBs) are expected to replace organic electrolyte batteries owing to its low price,safe and environmentally friendly characteristics.Herein,we fabricated vanadium-based Na1.25...Aqueous rechargeable zinc-ion batteries(ARZIBs) are expected to replace organic electrolyte batteries owing to its low price,safe and environmentally friendly characteristics.Herein,we fabricated vanadium-based Na1.25V3O8 nanosheets as a cathode material for ARZIBs,which present a high performance by electrochemical de-sodium at high voltage to form Na2V6O16 phase in the first cycle:high capacity of 390 mAh/g at 0.1 A/g,high rate perfo rmance(162 mAh/g at 10 A/g) and superior cycle stability(179 mAh/g with a high capacity retention of 88.2% of the maximum capacity after 2000 cycles).In addition,the cell exhibits a high energy density of 416.9 Wh/kg at 143.6 W/kg,suggesting great potential of the as-prepared Na1.25V3O8 nanosheets for ARZIBs.展开更多
采用平面波超软赝势密度泛函理论的方法研究了Zn_3V_2O_8的能带结构、电子态密度和光学特性。能带结果显示Zn_3V_2O_8呈间接带隙的绝缘体型能带,其禁带宽度为2.9 e V。详细的电子态密度结果显示其费米面上的态密度达到20 e/e V,费米能...采用平面波超软赝势密度泛函理论的方法研究了Zn_3V_2O_8的能带结构、电子态密度和光学特性。能带结果显示Zn_3V_2O_8呈间接带隙的绝缘体型能带,其禁带宽度为2.9 e V。详细的电子态密度结果显示其费米面上的态密度达到20 e/e V,费米能级附近的能级由Zn3p、V3p和O2p电子形成,Zn3d和O2s之间有强的杂化作用。介电性能结果显示在4.4~5.7 e V附近有强的吸收峰,在20.6 e V附近有一个次强吸收峰;吸收光谱显示在6.8 e V处有强吸收,在20.7 e V处有一个较弱的吸收峰。展开更多
基金supported by the National Key Research and Development Program of China(No.2017YFB1103000)National Natural Science Foundation of China(Nos.51772193,51702063)+1 种基金Nature Science Fund of Liaoning Province(No.20180550200)the Hong Kong Scholars Programs(No.XJ2019024)。
文摘Aqueous rechargeable zinc-ion batteries(ARZIBs) are expected to replace organic electrolyte batteries owing to its low price,safe and environmentally friendly characteristics.Herein,we fabricated vanadium-based Na1.25V3O8 nanosheets as a cathode material for ARZIBs,which present a high performance by electrochemical de-sodium at high voltage to form Na2V6O16 phase in the first cycle:high capacity of 390 mAh/g at 0.1 A/g,high rate perfo rmance(162 mAh/g at 10 A/g) and superior cycle stability(179 mAh/g with a high capacity retention of 88.2% of the maximum capacity after 2000 cycles).In addition,the cell exhibits a high energy density of 416.9 Wh/kg at 143.6 W/kg,suggesting great potential of the as-prepared Na1.25V3O8 nanosheets for ARZIBs.
文摘采用平面波超软赝势密度泛函理论的方法研究了Zn_3V_2O_8的能带结构、电子态密度和光学特性。能带结果显示Zn_3V_2O_8呈间接带隙的绝缘体型能带,其禁带宽度为2.9 e V。详细的电子态密度结果显示其费米面上的态密度达到20 e/e V,费米能级附近的能级由Zn3p、V3p和O2p电子形成,Zn3d和O2s之间有强的杂化作用。介电性能结果显示在4.4~5.7 e V附近有强的吸收峰,在20.6 e V附近有一个次强吸收峰;吸收光谱显示在6.8 e V处有强吸收,在20.7 e V处有一个较弱的吸收峰。
