Flexible aqueous Ni//Zn batteries have attracted much attention as promising candidates for energy storage in the field of flexible electronics.However,the Ni-based cathodes still face the challenges of poor conductiv...Flexible aqueous Ni//Zn batteries have attracted much attention as promising candidates for energy storage in the field of flexible electronics.However,the Ni-based cathodes still face the challenges of poor conductivity,confined charge/mass transfer,and non-flexibility.In this work,we designed a hollow tubular structure consisting of a conductive silver nanowire (Ag NW) wrapped by active Ni Co layered double hydroxide (LDH),for enhancing the electrical conductivity,improving the charge/mass transfer kinetics,and facilitating the ion penetration.By optimizing the contents of Ni,Co and Ag NW,the Ni_(4)Co LDH@Ag_(1.5)NW composite shows a maximum specific capacity of 115.83 m Ah g^(-1)at 0.1 A g^(-1)measured in a two-electrode system.Highlightingly,the flexible aqueous Ni//Zn battery assembled by Ni_(4)Co LDH@Ag_(1.5)NW interwoven with multi-walled carbon nanotube cathode and Zn foil anode realizes a high power density of 160μW cm^(-2)at the energy density of 23.14μWh cm^(-2),which is superior compared with those of oxide/hydroxide based devices and even higher than those of many carbon-based supercapacitors,showing its promising potentials for flexible energy storage applications.展开更多
CoAl LDHs with different molar ratio of Ni have been prepared by chemical co -precipitation method.XRD results show that these materials have layered struc tures.Electrochemical tests show that Co(Ni)Al LDHs as electr...CoAl LDHs with different molar ratio of Ni have been prepared by chemical co -precipitation method.XRD results show that these materials have layered struc tures.Electrochemical tests show that Co(Ni)Al LDHs as electrode material hav e typical capacit ive properties in a wide voltage range of0.0to0.6V;Co(Ni)Al LDH(Ni∶Co =4∶6)as an electrode material has the highest capacitance of960F · g -1 and good cycling performance.But the poor capacitive properties of NiAl LDH electrode are showed in a narrow voltage range of0.3to0.55V.展开更多
采用共沉淀-水热处理路线合成以ClO_4^-为层间阴离子的镍铝层状氢氧化物,通过离子交换的方法制备以Cl^-、NO_3^-、SO_4^(2-)和CO_3^(2-)为阴离子的层状氢氧化物(LDH)。用XRD、IR和SEM测试分析材料的结构、层间阴离子和形貌,用循环伏安...采用共沉淀-水热处理路线合成以ClO_4^-为层间阴离子的镍铝层状氢氧化物,通过离子交换的方法制备以Cl^-、NO_3^-、SO_4^(2-)和CO_3^(2-)为阴离子的层状氢氧化物(LDH)。用XRD、IR和SEM测试分析材料的结构、层间阴离子和形貌,用循环伏安、恒流充放电测试研究电化学性能。相对于其他阴离子,离子交换层间阴离子为CO_3^(2-)时,以800 m A/g的电流在0~0.6 V循环,首次放电比容量为182.7 m Ah/g,第9次循环达到最大放电比容量328.7 m Ah/g,随后缓慢降低,第100次循环的放电比容量为265.1 m Ah/g,最大单个镍原子电子转移数为1.52。展开更多
基金sponsored by the National Natural Science Foundation of China(61804054)the Natural Science Foundation of Shanghai(18ZR1410400)+2 种基金the Shanghai Sailing Program(17YF1403300)the Shanghai Aerospace Science and Technology Innovation Fundation(SISP2018)the Shanghai Aerospace Science and Technology Innovation Fund(SAST2019-067)。
文摘Flexible aqueous Ni//Zn batteries have attracted much attention as promising candidates for energy storage in the field of flexible electronics.However,the Ni-based cathodes still face the challenges of poor conductivity,confined charge/mass transfer,and non-flexibility.In this work,we designed a hollow tubular structure consisting of a conductive silver nanowire (Ag NW) wrapped by active Ni Co layered double hydroxide (LDH),for enhancing the electrical conductivity,improving the charge/mass transfer kinetics,and facilitating the ion penetration.By optimizing the contents of Ni,Co and Ag NW,the Ni_(4)Co LDH@Ag_(1.5)NW composite shows a maximum specific capacity of 115.83 m Ah g^(-1)at 0.1 A g^(-1)measured in a two-electrode system.Highlightingly,the flexible aqueous Ni//Zn battery assembled by Ni_(4)Co LDH@Ag_(1.5)NW interwoven with multi-walled carbon nanotube cathode and Zn foil anode realizes a high power density of 160μW cm^(-2)at the energy density of 23.14μWh cm^(-2),which is superior compared with those of oxide/hydroxide based devices and even higher than those of many carbon-based supercapacitors,showing its promising potentials for flexible energy storage applications.
文摘CoAl LDHs with different molar ratio of Ni have been prepared by chemical co -precipitation method.XRD results show that these materials have layered struc tures.Electrochemical tests show that Co(Ni)Al LDHs as electrode material hav e typical capacit ive properties in a wide voltage range of0.0to0.6V;Co(Ni)Al LDH(Ni∶Co =4∶6)as an electrode material has the highest capacitance of960F · g -1 and good cycling performance.But the poor capacitive properties of NiAl LDH electrode are showed in a narrow voltage range of0.3to0.55V.
文摘采用共沉淀-水热处理路线合成以ClO_4^-为层间阴离子的镍铝层状氢氧化物,通过离子交换的方法制备以Cl^-、NO_3^-、SO_4^(2-)和CO_3^(2-)为阴离子的层状氢氧化物(LDH)。用XRD、IR和SEM测试分析材料的结构、层间阴离子和形貌,用循环伏安、恒流充放电测试研究电化学性能。相对于其他阴离子,离子交换层间阴离子为CO_3^(2-)时,以800 m A/g的电流在0~0.6 V循环,首次放电比容量为182.7 m Ah/g,第9次循环达到最大放电比容量328.7 m Ah/g,随后缓慢降低,第100次循环的放电比容量为265.1 m Ah/g,最大单个镍原子电子转移数为1.52。
