以 L i2 CO3 和 NH4 VO3 为原料 ,低温合成了 L i1+ x V3 O8.通过对中间产物的热分析 ,选定了低温合成 L i1+ x V3 O8的适宜煅烧温度为 30 0℃ .研究表明 ,L i1+ x V3 O8,原料 L i/ V摩尔比应大于1∶ 3.以 Li1+ x V3 O8作为正极材料 ,...以 L i2 CO3 和 NH4 VO3 为原料 ,低温合成了 L i1+ x V3 O8.通过对中间产物的热分析 ,选定了低温合成 L i1+ x V3 O8的适宜煅烧温度为 30 0℃ .研究表明 ,L i1+ x V3 O8,原料 L i/ V摩尔比应大于1∶ 3.以 Li1+ x V3 O8作为正极材料 ,金属锂为负极组装了模拟电池 ,高、低温合成材料具有较高的放电容量和放电电压 .XRD、SEM分析结果说明低温合成样品的结晶度低、粒径较小 .展开更多
Zn_3V_3O_8 two-dimensional micro sheets are successfully synthesized by combination of solvothermal method and heat treatment. The X-ray diffraction(XRD) and field emission scanning electron microscopy(SEM) are used t...Zn_3V_3O_8 two-dimensional micro sheets are successfully synthesized by combination of solvothermal method and heat treatment. The X-ray diffraction(XRD) and field emission scanning electron microscopy(SEM) are used to characterize the structure and morphology of the samples, and the battery testing system is used to investigate its electrochemical performance. The results show that the Zn_3V_3O_8 is successfully obtained using mix solvent(water:ethylene glycol =1:1), and the sample takes on morphology of two-dimensional sheets. The initial discharge capacity for Zn_3V_3O_8 two-dimensional micro sheets is 752.0 mAh/g at 100 mA/g in the voltage range of 0.01-3 V. After heat treatment in a tube furnace at 550 ℃, the sample had the initial discharge capacity as 1152.0 mAh/g and maintained it at 901.4 mAh/g after 100 cycles. The good electrochemical performance for Zn_3V_3O_8 two-dimensional micro sheets make it possible to be used as novel anode for lithium ion battery application.展开更多
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
利用一种简易的模板法制成多孔石墨烯框架(pG),将石榴状的钒酸锌(Zn_(3)V_(3)O_(8))纳米球包覆在多孔石墨烯纳米片里,形成独特结构的钒酸锌/多孔石墨烯(Zn_(3)V_(3)O_(8)/p G)纳米复合材料.作为一种锂离子电池负极材料,Zn_(3)V_(3)O_(8)...利用一种简易的模板法制成多孔石墨烯框架(pG),将石榴状的钒酸锌(Zn_(3)V_(3)O_(8))纳米球包覆在多孔石墨烯纳米片里,形成独特结构的钒酸锌/多孔石墨烯(Zn_(3)V_(3)O_(8)/p G)纳米复合材料.作为一种锂离子电池负极材料,Zn_(3)V_(3)O_(8)/p G表现出良好的储锂性能,在1000 mA g^(-1)的电流密度下经过200次循环后达到586 mAh g^(-1)的可逆容量.Zn_(3)V_(3)O_(8)/p G良好的电化学性能主要归因于其独特的多孔网状碳结构为钒酸锌纳米球在充放电循环过程中的体积变化提供缓冲空间,以及石榴状的钒酸锌纳米球与多孔石墨烯之间形成的良好协同效应.展开更多
文摘以 L i2 CO3 和 NH4 VO3 为原料 ,低温合成了 L i1+ x V3 O8.通过对中间产物的热分析 ,选定了低温合成 L i1+ x V3 O8的适宜煅烧温度为 30 0℃ .研究表明 ,L i1+ x V3 O8,原料 L i/ V摩尔比应大于1∶ 3.以 Li1+ x V3 O8作为正极材料 ,金属锂为负极组装了模拟电池 ,高、低温合成材料具有较高的放电容量和放电电压 .XRD、SEM分析结果说明低温合成样品的结晶度低、粒径较小 .
基金Financial support by the National Natural Science Foundation of China (No. 21476063)
文摘Zn_3V_3O_8 two-dimensional micro sheets are successfully synthesized by combination of solvothermal method and heat treatment. The X-ray diffraction(XRD) and field emission scanning electron microscopy(SEM) are used to characterize the structure and morphology of the samples, and the battery testing system is used to investigate its electrochemical performance. The results show that the Zn_3V_3O_8 is successfully obtained using mix solvent(water:ethylene glycol =1:1), and the sample takes on morphology of two-dimensional sheets. The initial discharge capacity for Zn_3V_3O_8 two-dimensional micro sheets is 752.0 mAh/g at 100 mA/g in the voltage range of 0.01-3 V. After heat treatment in a tube furnace at 550 ℃, the sample had the initial discharge capacity as 1152.0 mAh/g and maintained it at 901.4 mAh/g after 100 cycles. The good electrochemical performance for Zn_3V_3O_8 two-dimensional micro sheets make it possible to be used as novel anode for lithium ion battery application.
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.
文摘利用一种简易的模板法制成多孔石墨烯框架(pG),将石榴状的钒酸锌(Zn_(3)V_(3)O_(8))纳米球包覆在多孔石墨烯纳米片里,形成独特结构的钒酸锌/多孔石墨烯(Zn_(3)V_(3)O_(8)/p G)纳米复合材料.作为一种锂离子电池负极材料,Zn_(3)V_(3)O_(8)/p G表现出良好的储锂性能,在1000 mA g^(-1)的电流密度下经过200次循环后达到586 mAh g^(-1)的可逆容量.Zn_(3)V_(3)O_(8)/p G良好的电化学性能主要归因于其独特的多孔网状碳结构为钒酸锌纳米球在充放电循环过程中的体积变化提供缓冲空间,以及石榴状的钒酸锌纳米球与多孔石墨烯之间形成的良好协同效应.
