The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Yong Lak Joo - One of the best experts on this subject based on the ideXlab platform.
-
Polymer/Ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance
Journal of Materials Science, 2017Co-Authors: Soshana A Smith, Jay Hoon Park, Brian P Williams, Yong Lak JooAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm^−1 compared to 0.29 mS cm^−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO_2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
-
Polymer/Ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance
Journal of Materials Science, 2016Co-Authors: Soshana Smith, Jay Hoon Park, Brian P Williams, Yong Lak JooAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm−1 compared to 0.29 mS cm−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
Brian P Williams - One of the best experts on this subject based on the ideXlab platform.
-
polymer Ceramic co continuous nanofiber membranes via room curable organopolysilazane for improved lithium ion battery performance
Journal of Materials Science, 2017Co-Authors: Soshana A Smith, Jay Hoon Park, Brian P WilliamsAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm−1 compared to 0.29 mS cm−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
-
Polymer/Ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance
Journal of Materials Science, 2017Co-Authors: Soshana A Smith, Jay Hoon Park, Brian P Williams, Yong Lak JooAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm^−1 compared to 0.29 mS cm^−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO_2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
-
Polymer/Ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance
Journal of Materials Science, 2016Co-Authors: Soshana Smith, Jay Hoon Park, Brian P Williams, Yong Lak JooAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm−1 compared to 0.29 mS cm−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
Jay Hoon Park - One of the best experts on this subject based on the ideXlab platform.
-
polymer Ceramic co continuous nanofiber membranes via room curable organopolysilazane for improved lithium ion battery performance
Journal of Materials Science, 2017Co-Authors: Soshana A Smith, Jay Hoon Park, Brian P WilliamsAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm−1 compared to 0.29 mS cm−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
-
Polymer/Ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance
Journal of Materials Science, 2017Co-Authors: Soshana A Smith, Jay Hoon Park, Brian P Williams, Yong Lak JooAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm^−1 compared to 0.29 mS cm^−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO_2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
-
Polymer/Ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance
Journal of Materials Science, 2016Co-Authors: Soshana Smith, Jay Hoon Park, Brian P Williams, Yong Lak JooAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm−1 compared to 0.29 mS cm−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
Soshana A Smith - One of the best experts on this subject based on the ideXlab platform.
-
polymer Ceramic co continuous nanofiber membranes via room curable organopolysilazane for improved lithium ion battery performance
Journal of Materials Science, 2017Co-Authors: Soshana A Smith, Jay Hoon Park, Brian P WilliamsAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm−1 compared to 0.29 mS cm−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
-
Polymer/Ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance
Journal of Materials Science, 2017Co-Authors: Soshana A Smith, Jay Hoon Park, Brian P Williams, Yong Lak JooAbstract:Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived Ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 to 30% to characterize the effects of various loadings on the mechanical, thermal properties, and electrochemical performance on the hybrid membranes. TEM images reveal that all composite fibers have a thin (~5 nm) Ceramic-rich sheath layer surrounding each fiber. In addition, there is also Ceramic present inside the fiber with the Ceramic forming continuous network within the nanofiber at high concentrations. The interconnected Ceramic network within the fiber disrupts the polymers ability to properly crystallize, leading to an increase in amorphous regions with an increase in Ceramic Inclusion. The presence of the Ceramic on the surface of the membrane in addition to the increased amorphous regions leads to excellent ionic conductivity and cycling performance. The 30 wt% PDC sample has an ionic conductivity of 1.05 mS cm^−1 compared to 0.29 mS cm^−1 of pristine PAN separator. All separators with additional PDC content showed increased initial capacity and capacity retention at 0.2C charging and discharging rate, with the 90:10, 80:20, and 70:30 wt% of PAN:PDC showing 89, 90 and 93% capacity retention of graphite/LiCoO_2 full cells over 100 cycles, respectively. In rate capability testing, PAN/PDC fibers demonstrated increased capacity retention even at increased charge rates. The results suggest that the increased ionic conductivity and wetting behavior by both the Ceramics within the membrane and on the surface of the membrane are more correlated to an increase in capacity retention and rate capability than the porosity.
Anna Maria Ferrari - One of the best experts on this subject based on the ideXlab platform.
-
new glass Ceramic Inclusion pigment
Journal of the American Ceramic Society, 2005Co-Authors: Federica Bondioli, Tiziano Manfredini, Cristina Siligardi, Anna Maria FerrariAbstract:Recently, the traditional Ceramic industry has demonstrated increased interest in obtaining Inclusion pigments to stabilize unstable chromophores, such as hematite or cadmium sulfoselenide, at firing temperature and in studying the actions of molten glasses. This present work focuses on a new method for synthesizing hematite-zircon Inclusion pigments from an unconventional mixture of precursors. For this purpose, a glassy composition that belongs to the LiO 2 -ZrO 2 -SiO 2 system and that crystallizes into zircon during the calcination step has been chosen.
-
New Glass–Ceramic Inclusion Pigment
Journal of the American Ceramic Society, 2005Co-Authors: Federica Bondioli, Tiziano Manfredini, Cristina Siligardi, Anna Maria FerrariAbstract:Recently, the traditional Ceramic industry has demonstrated increased interest in obtaining Inclusion pigments to stabilize unstable chromophores, such as hematite or cadmium sulfoselenide, at firing temperature and in studying the actions of molten glasses. This present work focuses on a new method for synthesizing hematite-zircon Inclusion pigments from an unconventional mixture of precursors. For this purpose, a glassy composition that belongs to the LiO 2 -ZrO 2 -SiO 2 system and that crystallizes into zircon during the calcination step has been chosen.