The Experts below are selected from a list of 58242 Experts worldwide ranked by ideXlab platform
Yi Cui - One of the best experts on this subject based on the ideXlab platform.
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enhancing Ionic Conductivity in composite polymer electrolytes with well aligned ceramic nanowires
Nature Energy, 2017Co-Authors: Wei Liu, Feifei Shi, Dingchang Lin, Yi Cui, Shuang Wang, Austin D. Sendek, Seok Woo LeeAbstract:In contrast to conventional organic liquid electrolytes that have leakage, flammability and chemical stability issues, solid electrolytes are widely considered as a promising candidate for the development of next-generation safe lithium-ion batteries. In solid polymer electrolytes that contain polymers and lithium salts, inorganic nanoparticles are often used as fillers to improve electrochemical performance, structure stability, and mechanical strength. However, such composite polymer electrolytes generally have low Ionic Conductivity. Here we report that a composite polymer electrolyte with well-aligned inorganic Li+-conductive nanowires exhibits an Ionic Conductivity of 6.05 × 10−5 S cm-1 at 30 ∘C, which is one order of magnitude higher than previous polymer electrolytes with randomly aligned nanowires. The large Conductivity enhancement is ascribed to a fast ion-conducting pathway without crossing junctions on the surfaces of the aligned nanowires. Moreover, the long-term structural stability of the polymer electrolyte is also improved by the use of nanowires. Fast Ionic Conductivity of solid electrolytes is a must in the development of next-generation solid-electrolyte-based lithium-ion batteries. Here the authors report that composite polymer electrolytes with well-aligned inorganic nanowires can achieve much larger conductivities than those without.
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improved lithium Ionic Conductivity in composite polymer electrolytes with oxide ion conducting nanowires
ACS Nano, 2016Co-Authors: Wei Liu, Dingchang Lin, Yi Cui, Jie Sun, Guangmin ZhouAbstract:Solid Li-ion electrolytes used in all-solid-state lithium-ion batteries (LIBs) are being considered to replace conventional liquid electrolytes that have leakage, flammability, and poor chemical stability issues, which represents one major challenge and opportunity for next-generation high-energy-density batteries. However, the low mobility of lithium ions in solid electrolytes limits their practical applications. Here, we report a solid composite polymer electrolyte with Y2O3-doped ZrO2 (YSZ) nanowires that are enriched with positive-charged oxygen vacancies. The morphologies and Ionic conductivities have been studied systemically according to concentration of Y2O3 dopant in the nanowires. In comparison to the conventional filler-free electrolyte with a Conductivity of 3.62 × 10–7 S cm–1, the composite polymer electrolytes with the YSZ nanowires show much higher Ionic Conductivity. It indicates that incorporation of 7 mol % of Y2O3-doped ZrO2 nanowires results in the highest Ionic Conductivity of 1.07 × ...
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high Ionic Conductivity of composite solid polymer electrolyte via in situ synthesis of monodispersed sio2 nanospheres in poly ethylene oxide
Nano Letters, 2016Co-Authors: Dingchang Lin, Wei Liu, Yayuan Liu, Hye Ryoung Lee, Pochun Hsu, Kai Liu, Yi CuiAbstract:High Ionic Conductivity solid polymer electrolyte (SPE) has long been desired for the next generation high energy and safe rechargeable lithium batteries. Among all of the SPEs, composite polymer electrolyte (CPE) with ceramic fillers has garnered great interest due to the enhancement of Ionic Conductivity. However, the high degree of polymer crystallinity, agglomeration of ceramic fillers, and weak polymer–ceramic interaction limit the further improvement of Ionic Conductivity. Different from the existing methods of blending preformed ceramic particles with polymers, here we introduce an in situ synthesis of ceramic filler particles in polymer electrolyte. Much stronger chemical/mechanical interactions between monodispersed 12 nm diameter SiO2 nanospheres and poly(ethylene oxide) (PEO) chains were produced by in situ hydrolysis, which significantly suppresses the crystallization of PEO and thus facilitates polymer segmental motion for Ionic conduction. In addition, an improved degree of LiClO4 dissociati...
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Ionic Conductivity enhancement of polymer electrolytes with ceramic nanowire fillers
Nano Letters, 2015Co-Authors: Wei Liu, Yi Cui, Nia Liu, Pochu Hsu, Hyunwook LeeAbstract:Solid-state electrolytes provide substantial improvements to safety and electrochemical stability in lithium-ion batteries when compared with conventional liquid electrolytes, which makes them a promising alternative technology for next-generation high-energy batteries. Currently, the low mobility of lithium ions in solid electrolytes limits their practical application. The ongoing research over the past few decades on dispersing of ceramic nanoparticles into polymer matrix has been proved effective to enhance Ionic Conductivity although it is challenging to form the efficiency networks of Ionic conduction with nanoparticles. In this work, we first report that ceramic nanowire fillers can facilitate formation of such Ionic conduction networks in polymer-based solid electrolyte to enhance its Ionic Conductivity by three orders of magnitude. Polyacrylonitrile-LiClO4 incorporated with 15 wt % Li0.33La0.557TiO3 nanowire composite electrolyte exhibits an unprecedented Ionic Conductivity of 2.4 × 10–4 S cm–1 at...
Wei Liu - One of the best experts on this subject based on the ideXlab platform.
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enhancing Ionic Conductivity in composite polymer electrolytes with well aligned ceramic nanowires
Nature Energy, 2017Co-Authors: Wei Liu, Feifei Shi, Dingchang Lin, Yi Cui, Shuang Wang, Austin D. Sendek, Seok Woo LeeAbstract:In contrast to conventional organic liquid electrolytes that have leakage, flammability and chemical stability issues, solid electrolytes are widely considered as a promising candidate for the development of next-generation safe lithium-ion batteries. In solid polymer electrolytes that contain polymers and lithium salts, inorganic nanoparticles are often used as fillers to improve electrochemical performance, structure stability, and mechanical strength. However, such composite polymer electrolytes generally have low Ionic Conductivity. Here we report that a composite polymer electrolyte with well-aligned inorganic Li+-conductive nanowires exhibits an Ionic Conductivity of 6.05 × 10−5 S cm-1 at 30 ∘C, which is one order of magnitude higher than previous polymer electrolytes with randomly aligned nanowires. The large Conductivity enhancement is ascribed to a fast ion-conducting pathway without crossing junctions on the surfaces of the aligned nanowires. Moreover, the long-term structural stability of the polymer electrolyte is also improved by the use of nanowires. Fast Ionic Conductivity of solid electrolytes is a must in the development of next-generation solid-electrolyte-based lithium-ion batteries. Here the authors report that composite polymer electrolytes with well-aligned inorganic nanowires can achieve much larger conductivities than those without.
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improved lithium Ionic Conductivity in composite polymer electrolytes with oxide ion conducting nanowires
ACS Nano, 2016Co-Authors: Wei Liu, Dingchang Lin, Yi Cui, Jie Sun, Guangmin ZhouAbstract:Solid Li-ion electrolytes used in all-solid-state lithium-ion batteries (LIBs) are being considered to replace conventional liquid electrolytes that have leakage, flammability, and poor chemical stability issues, which represents one major challenge and opportunity for next-generation high-energy-density batteries. However, the low mobility of lithium ions in solid electrolytes limits their practical applications. Here, we report a solid composite polymer electrolyte with Y2O3-doped ZrO2 (YSZ) nanowires that are enriched with positive-charged oxygen vacancies. The morphologies and Ionic conductivities have been studied systemically according to concentration of Y2O3 dopant in the nanowires. In comparison to the conventional filler-free electrolyte with a Conductivity of 3.62 × 10–7 S cm–1, the composite polymer electrolytes with the YSZ nanowires show much higher Ionic Conductivity. It indicates that incorporation of 7 mol % of Y2O3-doped ZrO2 nanowires results in the highest Ionic Conductivity of 1.07 × ...
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high Ionic Conductivity of composite solid polymer electrolyte via in situ synthesis of monodispersed sio2 nanospheres in poly ethylene oxide
Nano Letters, 2016Co-Authors: Dingchang Lin, Wei Liu, Yayuan Liu, Hye Ryoung Lee, Pochun Hsu, Kai Liu, Yi CuiAbstract:High Ionic Conductivity solid polymer electrolyte (SPE) has long been desired for the next generation high energy and safe rechargeable lithium batteries. Among all of the SPEs, composite polymer electrolyte (CPE) with ceramic fillers has garnered great interest due to the enhancement of Ionic Conductivity. However, the high degree of polymer crystallinity, agglomeration of ceramic fillers, and weak polymer–ceramic interaction limit the further improvement of Ionic Conductivity. Different from the existing methods of blending preformed ceramic particles with polymers, here we introduce an in situ synthesis of ceramic filler particles in polymer electrolyte. Much stronger chemical/mechanical interactions between monodispersed 12 nm diameter SiO2 nanospheres and poly(ethylene oxide) (PEO) chains were produced by in situ hydrolysis, which significantly suppresses the crystallization of PEO and thus facilitates polymer segmental motion for Ionic conduction. In addition, an improved degree of LiClO4 dissociati...
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Ionic Conductivity enhancement of polymer electrolytes with ceramic nanowire fillers
Nano Letters, 2015Co-Authors: Wei Liu, Yi Cui, Nia Liu, Pochu Hsu, Hyunwook LeeAbstract:Solid-state electrolytes provide substantial improvements to safety and electrochemical stability in lithium-ion batteries when compared with conventional liquid electrolytes, which makes them a promising alternative technology for next-generation high-energy batteries. Currently, the low mobility of lithium ions in solid electrolytes limits their practical application. The ongoing research over the past few decades on dispersing of ceramic nanoparticles into polymer matrix has been proved effective to enhance Ionic Conductivity although it is challenging to form the efficiency networks of Ionic conduction with nanoparticles. In this work, we first report that ceramic nanowire fillers can facilitate formation of such Ionic conduction networks in polymer-based solid electrolyte to enhance its Ionic Conductivity by three orders of magnitude. Polyacrylonitrile-LiClO4 incorporated with 15 wt % Li0.33La0.557TiO3 nanowire composite electrolyte exhibits an unprecedented Ionic Conductivity of 2.4 × 10–4 S cm–1 at...
Rongrong Chen - One of the best experts on this subject based on the ideXlab platform.
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developing a polysulfone based alkaline anion exchange membrane for improved Ionic Conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Deryn Chu, Rongrong Chen, Dong XieAbstract:Abstract Alkaline anion exchange membranes of high Ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate quaternization approach could significantly improve the Ionic Conductivity and also could optimize the Conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the Ionic Conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the Ionic Conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
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developing a polysulfone based alkaline anion exchange membrane for improved Ionic Conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Rongrong ChenAbstract:Abstract Alkaline anion exchange membranes of high Ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate quaternization approach could significantly improve the Ionic Conductivity and also could optimize the Conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the Ionic Conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the Ionic Conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
Guigui Wang - One of the best experts on this subject based on the ideXlab platform.
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developing a polysulfone based alkaline anion exchange membrane for improved Ionic Conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Deryn Chu, Rongrong Chen, Dong XieAbstract:Abstract Alkaline anion exchange membranes of high Ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate quaternization approach could significantly improve the Ionic Conductivity and also could optimize the Conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the Ionic Conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the Ionic Conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
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developing a polysulfone based alkaline anion exchange membrane for improved Ionic Conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Rongrong ChenAbstract:Abstract Alkaline anion exchange membranes of high Ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate quaternization approach could significantly improve the Ionic Conductivity and also could optimize the Conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the Ionic Conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the Ionic Conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
Dong Xie - One of the best experts on this subject based on the ideXlab platform.
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developing a polysulfone based alkaline anion exchange membrane for improved Ionic Conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Deryn Chu, Rongrong Chen, Dong XieAbstract:Abstract Alkaline anion exchange membranes of high Ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate quaternization approach could significantly improve the Ionic Conductivity and also could optimize the Conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the Ionic Conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the Ionic Conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
