The recent boom in flexible and wearable electronics requires their powersources not only to be adequately compact but also could undergo extremedeformation without significant degradation in performance. Here, flexib...The recent boom in flexible and wearable electronics requires their powersources not only to be adequately compact but also could undergo extremedeformation without significant degradation in performance. Here, flexibleand tailorable quasi‐solid‐state microsized Ag/Zn batteries (micro‐AZBs)were designed by combining mask‐assisted spray printing and electrochemicaldeposition strategies. The micro‐AZBs display ultrastable outputvoltage, excellent energy, and power densities, as well as stable cycling performance.Furthermore, the micro‐AZBs with desired shapes can be designedin series or in parallel on a flexible chip to output improved voltage or currentwith the internal connection. More importantly, the microelectrodes could besprayed on various substrates. Flexible micro‐AZBs could be achieved onflexible substrates and tailorable micro‐AZBs are obtained when they arefabricated on clothes. They exhibit stable electrochemical performance evenunder bending or cutting states. The novel design of such quasi‐solid‐statemicro‐AZBs would pave a way for the miniaturization and integration ofenergy storage devices.展开更多
Aqueous zinc-ion batteries(ZIBs)have attracted immense attention for flexible energy storage devices due to their high safety and low cost.However,conventional flexible aqueous ZIBs will undergo severe capacity loss a...Aqueous zinc-ion batteries(ZIBs)have attracted immense attention for flexible energy storage devices due to their high safety and low cost.However,conventional flexible aqueous ZIBs will undergo severe capacity loss at subzero temperature due to the inevitably freeze of electrolytes.In addition,under large bending or stretching strains,the encapsulation of devices would be damaged,which causes the evaporation of water in electrolytes and results in device failure.Herein,an anti-freezing and anti-drying gel electrolyte based on polyacrylamide(PAM)and glycerol(Gly)is developed.The strong hydrogen-bonding interactions between PAM or Gly and water molecules not only avoid the crystallization of the gel electrolyte at low temperatures,but also constrain the free water and restrict its evaporation.Therefore,such gel electrolyte displays a high ionic conductivity of 9.65×10^(−5)S cm^(−1)at−40℃.Furthermore,it can restrict the dehydration process when the electrolyte is exposed to ambient environment.The flexible ZIBs based on such gel electrolyte exhibit excellent electrochemical performance at−40℃and the devices without encapsulation retain 98%of their initial capacity in ambient condition after 30 days.This work provides a route to design anti-freezing and anti-drying gel electrolytes for aqueous energy storage devices.展开更多
Synchronously reducing/self-assembling strategy on Zn substrate was designed to fabricate large-area cation-doped hydrated V_(2)O_(5)/multi-walled carbon nanotube(D-HVO/MWCNT)composite films.Interestingly,the Zn^(2+)i...Synchronously reducing/self-assembling strategy on Zn substrate was designed to fabricate large-area cation-doped hydrated V_(2)O_(5)/multi-walled carbon nanotube(D-HVO/MWCNT)composite films.Interestingly,the Zn^(2+)ions are simultaneously doped in hydrated V_(2)O_(5) during the assembly process,which will be beneficial to the high electrochemical performance of hydrated V_(2)O_(5).By further combining 3D conductive MWCNT network,the freestanding D-HVO/MWCNT composite films display high capacity,excellent rate capability,and remarkable long-term cycling performance(up to 10,000 cycles with a high capacity retention of 98.5%).Moreover,owing to the high conductivity and flexibility of the D-HVO/MWCNT composite films,the softpackaged aqueous zinc-ion batteries(ZIBs)were constructed based on such composite films.The devices exhibit stable electrochemical performance even under different bending states.Therefore,such a strategy provides a promising route to achieve large-area carbon and metal oxides-based composite films with high performance and good flexibility.展开更多
A new coordination polymer,[Co_(2)(L)_(2)(4,4'-bipy)]_(n)·3nH_(2)O(1)based on 5-(3-methyl-5-phenyl-4H-1,2,4-tri-azol-4-yl)isophthalic acid(H_(2)L)and 4,4'-bipyridine(4,4'-bipy)has been hydrothermally ...A new coordination polymer,[Co_(2)(L)_(2)(4,4'-bipy)]_(n)·3nH_(2)O(1)based on 5-(3-methyl-5-phenyl-4H-1,2,4-tri-azol-4-yl)isophthalic acid(H_(2)L)and 4,4'-bipyridine(4,4'-bipy)has been hydrothermally synthesized and character-ized by single-crystal X-ray diffraction,XRPD,IR,and elemental analysis.Temperature-dependent magnetic sus-ceptibility and thermal degradation for 1 were also studied.The asymmetric unit of compound 1 consists of two crystallographically independent Co(II)ion,two L^(2−)ligand,one 4,4'-bipy ligand,and three lattice water molecules.The 2D triangle networks were linked by the bridging 4,4'-bipy ligand to give rise to a 2-fold interpenetrated 3D architecture.The simplest cyclic motif of the 2D networks is a triangle ring consisting of three Co(II)cations and three L^(2−)ligands.So we can define Co(II)ions as 4-connected nodes and the L^(2−)ligands as 3-connected nodes.Thus,the 3D structure can be described as a 2-fold parallel interpenetrated ins InS 3,4-conn topology.展开更多
基金This study was supported by National Key R&D Programof China(Grant No.2017YFA0206701)National Natural Science Foundation of China(Grant No.51822205 and 21875121)+2 种基金China Postdoctoral Science Foundation(Grant No.2019M650045)Ministry of Education of China(Grant No.B12015)Natural Science Foundation of Tianjin(Grant No.18JCJQJC46300).
文摘The recent boom in flexible and wearable electronics requires their powersources not only to be adequately compact but also could undergo extremedeformation without significant degradation in performance. Here, flexibleand tailorable quasi‐solid‐state microsized Ag/Zn batteries (micro‐AZBs)were designed by combining mask‐assisted spray printing and electrochemicaldeposition strategies. The micro‐AZBs display ultrastable outputvoltage, excellent energy, and power densities, as well as stable cycling performance.Furthermore, the micro‐AZBs with desired shapes can be designedin series or in parallel on a flexible chip to output improved voltage or currentwith the internal connection. More importantly, the microelectrodes could besprayed on various substrates. Flexible micro‐AZBs could be achieved onflexible substrates and tailorable micro‐AZBs are obtained when they arefabricated on clothes. They exhibit stable electrochemical performance evenunder bending or cutting states. The novel design of such quasi‐solid‐statemicro‐AZBs would pave a way for the miniaturization and integration ofenergy storage devices.
基金supported by the Natural Science Foundation of Tianjin(18JCJQJC46300 and 19JCZDJC31900)the National Natural Science Foundation of China(51822205 and 21875121)+2 种基金the Ministry of Science and Technology of China(2019YFA0705600 and 2017YFA0206701)the Ministry of Education of China(B12015)the"Frontiers Science Center for New Organic Matter",Nankai University(63181206)。
文摘Aqueous zinc-ion batteries(ZIBs)have attracted immense attention for flexible energy storage devices due to their high safety and low cost.However,conventional flexible aqueous ZIBs will undergo severe capacity loss at subzero temperature due to the inevitably freeze of electrolytes.In addition,under large bending or stretching strains,the encapsulation of devices would be damaged,which causes the evaporation of water in electrolytes and results in device failure.Herein,an anti-freezing and anti-drying gel electrolyte based on polyacrylamide(PAM)and glycerol(Gly)is developed.The strong hydrogen-bonding interactions between PAM or Gly and water molecules not only avoid the crystallization of the gel electrolyte at low temperatures,but also constrain the free water and restrict its evaporation.Therefore,such gel electrolyte displays a high ionic conductivity of 9.65×10^(−5)S cm^(−1)at−40℃.Furthermore,it can restrict the dehydration process when the electrolyte is exposed to ambient environment.The flexible ZIBs based on such gel electrolyte exhibit excellent electrochemical performance at−40℃and the devices without encapsulation retain 98%of their initial capacity in ambient condition after 30 days.This work provides a route to design anti-freezing and anti-drying gel electrolytes for aqueous energy storage devices.
基金supported by the Natural Science Foundation of Tianjin(18JCJQJC46300,19JCZDJC31900)the National Natural Science Foundation of China(51972231)。
文摘Synchronously reducing/self-assembling strategy on Zn substrate was designed to fabricate large-area cation-doped hydrated V_(2)O_(5)/multi-walled carbon nanotube(D-HVO/MWCNT)composite films.Interestingly,the Zn^(2+)ions are simultaneously doped in hydrated V_(2)O_(5) during the assembly process,which will be beneficial to the high electrochemical performance of hydrated V_(2)O_(5).By further combining 3D conductive MWCNT network,the freestanding D-HVO/MWCNT composite films display high capacity,excellent rate capability,and remarkable long-term cycling performance(up to 10,000 cycles with a high capacity retention of 98.5%).Moreover,owing to the high conductivity and flexibility of the D-HVO/MWCNT composite films,the softpackaged aqueous zinc-ion batteries(ZIBs)were constructed based on such composite films.The devices exhibit stable electrochemical performance even under different bending states.Therefore,such a strategy provides a promising route to achieve large-area carbon and metal oxides-based composite films with high performance and good flexibility.
基金This work was supported by the National Natural Science Foundation of China(Nos.21071083 and 20771062).
文摘A new coordination polymer,[Co_(2)(L)_(2)(4,4'-bipy)]_(n)·3nH_(2)O(1)based on 5-(3-methyl-5-phenyl-4H-1,2,4-tri-azol-4-yl)isophthalic acid(H_(2)L)and 4,4'-bipyridine(4,4'-bipy)has been hydrothermally synthesized and character-ized by single-crystal X-ray diffraction,XRPD,IR,and elemental analysis.Temperature-dependent magnetic sus-ceptibility and thermal degradation for 1 were also studied.The asymmetric unit of compound 1 consists of two crystallographically independent Co(II)ion,two L^(2−)ligand,one 4,4'-bipy ligand,and three lattice water molecules.The 2D triangle networks were linked by the bridging 4,4'-bipy ligand to give rise to a 2-fold interpenetrated 3D architecture.The simplest cyclic motif of the 2D networks is a triangle ring consisting of three Co(II)cations and three L^(2−)ligands.So we can define Co(II)ions as 4-connected nodes and the L^(2−)ligands as 3-connected nodes.Thus,the 3D structure can be described as a 2-fold parallel interpenetrated ins InS 3,4-conn topology.
