The Experts below are selected from a list of 204660 Experts worldwide ranked by ideXlab platform
Arumugam Manthiram - One of the best experts on this subject based on the ideXlab platform.
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Rational Design of Lithium–Sulfur Battery Cathodes Based on Experimentally Determined Maximum Active Material Thickness
Journal of the American Chemical Society, 2017Co-Authors: Michael J. Klein, Gabriel M. Veith, Arumugam ManthiramAbstract:Rational design of conductive carbon hosts for high energy density lithium–sulfur batteries requires an understanding of the fundamental limitations to insulating active Material loading. In this work, we investigate the electrochemistry of lithium sulfide films ranging in Thickness from 30 to 3500 nm. We show that films thicker than approximately 40 nm cannot be charged at local charge densities above 1 μA cm–2, and by implication, the maximum useful pore diameter is near 60 nm in a practical cathode. “Activation” overpotentials for Li2S are identified in thicker films, resulting from polysulfide generation, but are shown not to improve the fundamental areal charge limitations. We develop a model for filling of conductive pores with active Material to rationally design composites based on local charge density. For low-electrolyte applications, the importance of matching micropore volume to sulfide loading and cycling rate is emphasized.
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rational design of lithium sulfur battery cathodes based on experimentally determined maximum active Material Thickness
Journal of the American Chemical Society, 2017Co-Authors: Michael J. Klein, Gabriel M. Veith, Arumugam ManthiramAbstract:Rational design of conductive carbon hosts for high energy density lithium–sulfur batteries requires an understanding of the fundamental limitations to insulating active Material loading. In this work, we investigate the electrochemistry of lithium sulfide films ranging in Thickness from 30 to 3500 nm. We show that films thicker than approximately 40 nm cannot be charged at local charge densities above 1 μA cm–2, and by implication, the maximum useful pore diameter is near 60 nm in a practical cathode. “Activation” overpotentials for Li2S are identified in thicker films, resulting from polysulfide generation, but are shown not to improve the fundamental areal charge limitations. We develop a model for filling of conductive pores with active Material to rationally design composites based on local charge density. For low-electrolyte applications, the importance of matching micropore volume to sulfide loading and cycling rate is emphasized.
Michael J. Klein - One of the best experts on this subject based on the ideXlab platform.
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Rational Design of Lithium–Sulfur Battery Cathodes Based on Experimentally Determined Maximum Active Material Thickness
Journal of the American Chemical Society, 2017Co-Authors: Michael J. Klein, Gabriel M. Veith, Arumugam ManthiramAbstract:Rational design of conductive carbon hosts for high energy density lithium–sulfur batteries requires an understanding of the fundamental limitations to insulating active Material loading. In this work, we investigate the electrochemistry of lithium sulfide films ranging in Thickness from 30 to 3500 nm. We show that films thicker than approximately 40 nm cannot be charged at local charge densities above 1 μA cm–2, and by implication, the maximum useful pore diameter is near 60 nm in a practical cathode. “Activation” overpotentials for Li2S are identified in thicker films, resulting from polysulfide generation, but are shown not to improve the fundamental areal charge limitations. We develop a model for filling of conductive pores with active Material to rationally design composites based on local charge density. For low-electrolyte applications, the importance of matching micropore volume to sulfide loading and cycling rate is emphasized.
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rational design of lithium sulfur battery cathodes based on experimentally determined maximum active Material Thickness
Journal of the American Chemical Society, 2017Co-Authors: Michael J. Klein, Gabriel M. Veith, Arumugam ManthiramAbstract:Rational design of conductive carbon hosts for high energy density lithium–sulfur batteries requires an understanding of the fundamental limitations to insulating active Material loading. In this work, we investigate the electrochemistry of lithium sulfide films ranging in Thickness from 30 to 3500 nm. We show that films thicker than approximately 40 nm cannot be charged at local charge densities above 1 μA cm–2, and by implication, the maximum useful pore diameter is near 60 nm in a practical cathode. “Activation” overpotentials for Li2S are identified in thicker films, resulting from polysulfide generation, but are shown not to improve the fundamental areal charge limitations. We develop a model for filling of conductive pores with active Material to rationally design composites based on local charge density. For low-electrolyte applications, the importance of matching micropore volume to sulfide loading and cycling rate is emphasized.
Wiriyakorn Phanitwong - One of the best experts on this subject based on the ideXlab platform.
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Process parameter design of spring-back and spring-go in V-bending process using Taguchi technique
Materials & Design, 2011Co-Authors: Sutasn Thipprakmas, Wiriyakorn PhanitwongAbstract:Abstract Bent parts of complex shapes with high precision are increasingly required. To achieve a high precision of parts, especially the required bending angle, a suitable design of process parameters is strictly considered. In this study, process parameters of bending angle, Material Thickness and punch radius were investigated. The finite element method (FEM), in association with the Taguchi and the analysis of variance (ANOVA) techniques, was carried out to investigate the degree of importance of process parameters in V-bending process. The results revealed that the degree of importance of process parameters in V-bending process depended on the spring-back and spring-go. The Material Thickness has a major influence on the spring-back. In contrast, in the case of spring-go, the bending angle has a major influence and closely followed by the Material Thickness. In addition to predicting the degree of importance of process parameters by the combination of the FEM simulation, the Taguchi technique, and the ANOVA technique, by facilitating an improvement in the quality of the required bending angle was strictly considered by optimization of these process parameters corresponding with the spring-back and spring-go.
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Influences of Material Thickness on Hole-Flange Forming Limitation
Advanced Materials Research, 2011Co-Authors: Sutasn Thipprakmas, Wiriyakorn PhanitwongAbstract:In recent years, the hole-flanged components are not only fabricated for a thin sheet metal but they are also increasingly manufactured for a thick sheet metal especially in the automotive industry. However, most of the past researches have been studied the hole-flanging of thin sheet metal. In this study, the influences of Material Thickness were investigated using the finite element method (FEM) and laboratory experiments. Based on the stress distribution analysis, as the Material Thickness increased and the hole-flange forming ratio decreased, the effects of bending feature and the Material stretching increased which resulted in the easy crack formation. The relationship between Material Thickness and hole-flange forming limitation was also investigated. In addition, the poor flatness on flange edge increased as the Material Thickness increased. The FEM simulation results showed the good agreement with the experimental results.
Gabriel M. Veith - One of the best experts on this subject based on the ideXlab platform.
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Rational Design of Lithium–Sulfur Battery Cathodes Based on Experimentally Determined Maximum Active Material Thickness
Journal of the American Chemical Society, 2017Co-Authors: Michael J. Klein, Gabriel M. Veith, Arumugam ManthiramAbstract:Rational design of conductive carbon hosts for high energy density lithium–sulfur batteries requires an understanding of the fundamental limitations to insulating active Material loading. In this work, we investigate the electrochemistry of lithium sulfide films ranging in Thickness from 30 to 3500 nm. We show that films thicker than approximately 40 nm cannot be charged at local charge densities above 1 μA cm–2, and by implication, the maximum useful pore diameter is near 60 nm in a practical cathode. “Activation” overpotentials for Li2S are identified in thicker films, resulting from polysulfide generation, but are shown not to improve the fundamental areal charge limitations. We develop a model for filling of conductive pores with active Material to rationally design composites based on local charge density. For low-electrolyte applications, the importance of matching micropore volume to sulfide loading and cycling rate is emphasized.
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rational design of lithium sulfur battery cathodes based on experimentally determined maximum active Material Thickness
Journal of the American Chemical Society, 2017Co-Authors: Michael J. Klein, Gabriel M. Veith, Arumugam ManthiramAbstract:Rational design of conductive carbon hosts for high energy density lithium–sulfur batteries requires an understanding of the fundamental limitations to insulating active Material loading. In this work, we investigate the electrochemistry of lithium sulfide films ranging in Thickness from 30 to 3500 nm. We show that films thicker than approximately 40 nm cannot be charged at local charge densities above 1 μA cm–2, and by implication, the maximum useful pore diameter is near 60 nm in a practical cathode. “Activation” overpotentials for Li2S are identified in thicker films, resulting from polysulfide generation, but are shown not to improve the fundamental areal charge limitations. We develop a model for filling of conductive pores with active Material to rationally design composites based on local charge density. For low-electrolyte applications, the importance of matching micropore volume to sulfide loading and cycling rate is emphasized.
Sutasn Thipprakmas - One of the best experts on this subject based on the ideXlab platform.
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Process parameter design of spring-back and spring-go in V-bending process using Taguchi technique
Materials & Design, 2011Co-Authors: Sutasn Thipprakmas, Wiriyakorn PhanitwongAbstract:Abstract Bent parts of complex shapes with high precision are increasingly required. To achieve a high precision of parts, especially the required bending angle, a suitable design of process parameters is strictly considered. In this study, process parameters of bending angle, Material Thickness and punch radius were investigated. The finite element method (FEM), in association with the Taguchi and the analysis of variance (ANOVA) techniques, was carried out to investigate the degree of importance of process parameters in V-bending process. The results revealed that the degree of importance of process parameters in V-bending process depended on the spring-back and spring-go. The Material Thickness has a major influence on the spring-back. In contrast, in the case of spring-go, the bending angle has a major influence and closely followed by the Material Thickness. In addition to predicting the degree of importance of process parameters by the combination of the FEM simulation, the Taguchi technique, and the ANOVA technique, by facilitating an improvement in the quality of the required bending angle was strictly considered by optimization of these process parameters corresponding with the spring-back and spring-go.
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Influences of Material Thickness on Hole-Flange Forming Limitation
Advanced Materials Research, 2011Co-Authors: Sutasn Thipprakmas, Wiriyakorn PhanitwongAbstract:In recent years, the hole-flanged components are not only fabricated for a thin sheet metal but they are also increasingly manufactured for a thick sheet metal especially in the automotive industry. However, most of the past researches have been studied the hole-flanging of thin sheet metal. In this study, the influences of Material Thickness were investigated using the finite element method (FEM) and laboratory experiments. Based on the stress distribution analysis, as the Material Thickness increased and the hole-flange forming ratio decreased, the effects of bending feature and the Material stretching increased which resulted in the easy crack formation. The relationship between Material Thickness and hole-flange forming limitation was also investigated. In addition, the poor flatness on flange edge increased as the Material Thickness increased. The FEM simulation results showed the good agreement with the experimental results.