The Experts below are selected from a list of 159543 Experts worldwide ranked by ideXlab platform
Mei Cai - One of the best experts on this subject based on the ideXlab platform.
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Cathode porosity is a missing Key Parameter to optimize lithium-sulfur battery energy density
Nature Communications, 2019Co-Authors: Ning Kang, Yuxiao Lin, Dongping Lu, Jie Xiao, Yue Qi, Li Yang, Mei CaiAbstract:For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here the authors show the impact of porosity on the performance of lithium-sulfur batteries and reveal the mechanism through analytical modeling.AbstractWhile high sulfur loading has been pursued as a Key Parameter to build realistic high-energy lithium-sulfur batteries, less attention has been paid to the cathode porosity, which is much higher in sulfur/carbon composite cathodes than in traditional lithium-ion battery electrodes. For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here we report the profound impact on the discharge polarization, reversible capacity, and cell cycling life of lithium-sulfur batteries by decreasing cathode porosities from 70 to 40%. According to the developed mechanism-based analytical model, we demonstrate that sulfur utilization is limited by the solubility of lithium-polysulfides and further conversion from lithium-polysulfides to Li_2S is limited by the electronically accessible surface area of the carbon matrix. Finally, we predict an optimized cathode porosity to maximize the cell level volumetric energy density without sacrificing the sulfur utilization.
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cathode porosity is a missing Key Parameter to optimize lithium sulfur battery energy density
Nature Communications, 2019Co-Authors: Ning Kang, Yuxiao Lin, Jie Xiao, Li Yang, Mei CaiAbstract:While high sulfur loading has been pursued as a Key Parameter to build realistic high-energy lithium-sulfur batteries, less attention has been paid to the cathode porosity, which is much higher in sulfur/carbon composite cathodes than in traditional lithium-ion battery electrodes. For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here we report the profound impact on the discharge polarization, reversible capacity, and cell cycling life of lithium-sulfur batteries by decreasing cathode porosities from 70 to 40%. According to the developed mechanism-based analytical model, we demonstrate that sulfur utilization is limited by the solubility of lithium-polysulfides and further conversion from lithium-polysulfides to Li2S is limited by the electronically accessible surface area of the carbon matrix. Finally, we predict an optimized cathode porosity to maximize the cell level volumetric energy density without sacrificing the sulfur utilization.
Claire Dumas - One of the best experts on this subject based on the ideXlab platform.
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substrate milling pretreatment as a Key Parameter for solid state anaerobic digestion optimization
Bioresource Technology, 2014Co-Authors: Jean-charles Motte, Renaud Escudie, Jérôme Hamelin, Jean-philippe Steyer, Nicolas Bernet, Jean-philippe Delgenès, Claire DumasAbstract:The effect of milling pretreatment on performances of Solid-State Anaerobic Digestion (SS-AD) of raw lignocellulosic residue is still controverted. Three batch reactors treating different straw particle sizes (milled 0.25 mm, 1 mm and 10 mm) were followed during 62 days (6 sampling dates). Although a fine milling improves substrate accessibility and conversion rate (up to 30% compared to coarse milling), it also increases the risk of media acidification because of rapid and high acids production during fermentation of the substrate soluble fraction. Meanwhile, a gradual adaptation of microbial communities, were observed according to both reaction progress and methanogenic performances. The study concluded that particle size reduction affected strongly the performances of the reaction due to an increase of substrate bioaccessibility. An optimization of SS-AD processes thanks to particle size reduction could therefore be applied at farm or industrial scale only if a specific management of the soluble compounds is established.
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total solids content a Key Parameter of metabolic pathways in dry anaerobic digestion
Biotechnology for Biofuels, 2013Co-Authors: Jean-charles Motte, Eric Trably, Renaud Escudie, Jérôme Hamelin, Jean-philippe Steyer, Nicolas Bernet, Jean-philippe Delgenès, Claire DumasAbstract:Background In solid-state anaerobic digestion (AD) bioprocesses, hydrolytic and acidogenic microbial metabolisms have not yet been clarified. Since these stages are particularly important for the establishment of the biological reaction, better knowledge could optimize the process performances by process Parameters adjustment.
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Total solids content: a Key Parameter of metabolic pathways in dry anaerobic digestion.
Biotechnology for Biofuels, 2013Co-Authors: Jean-charles Motte, Eric Trably, Renaud Escudie, Jérôme Hamelin, Jean-philippe Steyer, Nicolas Bernet, Jean-philippe Delgenès, Claire DumasAbstract:In solid-state anaerobic digestion (AD) bioprocesses, hydrolytic and acidogenic microbial metabolisms have not yet been clarified. Since these stages are particularly important for the establishment of the biological reaction, better knowledge could optimize the process performances by process Parameters adjustment. This study demonstrated the effect of total solids (TS) content on microbial fermentation of wheat straw with six different TS contents ranging from wet to dry conditions (10 to 33% TS). Three groups of metabolic behaviors were distinguished based on wheat straw conversion rates with 2,200, 1,600, and 1,400 mmol.kgVS-1 of fermentative products under wet (10 and 14% TS), dry (19 to 28% TS), and highly dry (28 to 33% TS) conditions, respectively. Furthermore, both wet and dry fermentations showed acetic and butyric acid metabolisms, whereas a mainly butyric acid metabolism occurred in highly dry fermentation. Substrate conversion was reduced with no changes of the metabolic pathways until a clear limit at 28% TS content, which corresponded to the threshold value of free water content of wheat straw. This study suggested that metabolic pathways present a limit of TS content for high-solid AD.
Li Yang - One of the best experts on this subject based on the ideXlab platform.
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Cathode porosity is a missing Key Parameter to optimize lithium-sulfur battery energy density
Nature Communications, 2019Co-Authors: Ning Kang, Yuxiao Lin, Dongping Lu, Jie Xiao, Yue Qi, Li Yang, Mei CaiAbstract:For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here the authors show the impact of porosity on the performance of lithium-sulfur batteries and reveal the mechanism through analytical modeling.AbstractWhile high sulfur loading has been pursued as a Key Parameter to build realistic high-energy lithium-sulfur batteries, less attention has been paid to the cathode porosity, which is much higher in sulfur/carbon composite cathodes than in traditional lithium-ion battery electrodes. For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here we report the profound impact on the discharge polarization, reversible capacity, and cell cycling life of lithium-sulfur batteries by decreasing cathode porosities from 70 to 40%. According to the developed mechanism-based analytical model, we demonstrate that sulfur utilization is limited by the solubility of lithium-polysulfides and further conversion from lithium-polysulfides to Li_2S is limited by the electronically accessible surface area of the carbon matrix. Finally, we predict an optimized cathode porosity to maximize the cell level volumetric energy density without sacrificing the sulfur utilization.
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cathode porosity is a missing Key Parameter to optimize lithium sulfur battery energy density
Nature Communications, 2019Co-Authors: Ning Kang, Yuxiao Lin, Jie Xiao, Li Yang, Mei CaiAbstract:While high sulfur loading has been pursued as a Key Parameter to build realistic high-energy lithium-sulfur batteries, less attention has been paid to the cathode porosity, which is much higher in sulfur/carbon composite cathodes than in traditional lithium-ion battery electrodes. For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here we report the profound impact on the discharge polarization, reversible capacity, and cell cycling life of lithium-sulfur batteries by decreasing cathode porosities from 70 to 40%. According to the developed mechanism-based analytical model, we demonstrate that sulfur utilization is limited by the solubility of lithium-polysulfides and further conversion from lithium-polysulfides to Li2S is limited by the electronically accessible surface area of the carbon matrix. Finally, we predict an optimized cathode porosity to maximize the cell level volumetric energy density without sacrificing the sulfur utilization.
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frequency as a Key Parameter in discriminating the failure types of thermal barrier coatings cluster analysis of acoustic emission signals
Surface & Coatings Technology, 2015Co-Authors: Li Yang, H Kang, Yichun Zhou, Wang Zhu, Canying CaiAbstract:Abstract A Key Parameter in discriminating the failure types of thermal barrier coatings (TBCs) was found out by using the k -means cluster analysis of acoustic emission (AE) signals. It is shown that there are five classes of mechanisms, including surface vertical cracks, opening interface cracks, sliding interface cracks, substrate deformation and macroscopic cleavage or spallation. Except for the last one, the other four classes can be clearly distinguished from their peak frequency distributions in the ranges of 170–250, 400–500, 260–350 and 40–150 kHz, respectively. However, AE signals overlap with each other in other Parameter spaces, e.g., amplitude, energy, rise time, and duration time. The results indicate that the frequency can be applied to identify the AE source mechanisms in TBCs.
Ning Kang - One of the best experts on this subject based on the ideXlab platform.
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Cathode porosity is a missing Key Parameter to optimize lithium-sulfur battery energy density
Nature Communications, 2019Co-Authors: Ning Kang, Yuxiao Lin, Dongping Lu, Jie Xiao, Yue Qi, Li Yang, Mei CaiAbstract:For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here the authors show the impact of porosity on the performance of lithium-sulfur batteries and reveal the mechanism through analytical modeling.AbstractWhile high sulfur loading has been pursued as a Key Parameter to build realistic high-energy lithium-sulfur batteries, less attention has been paid to the cathode porosity, which is much higher in sulfur/carbon composite cathodes than in traditional lithium-ion battery electrodes. For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here we report the profound impact on the discharge polarization, reversible capacity, and cell cycling life of lithium-sulfur batteries by decreasing cathode porosities from 70 to 40%. According to the developed mechanism-based analytical model, we demonstrate that sulfur utilization is limited by the solubility of lithium-polysulfides and further conversion from lithium-polysulfides to Li_2S is limited by the electronically accessible surface area of the carbon matrix. Finally, we predict an optimized cathode porosity to maximize the cell level volumetric energy density without sacrificing the sulfur utilization.
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cathode porosity is a missing Key Parameter to optimize lithium sulfur battery energy density
Nature Communications, 2019Co-Authors: Ning Kang, Yuxiao Lin, Jie Xiao, Li Yang, Mei CaiAbstract:While high sulfur loading has been pursued as a Key Parameter to build realistic high-energy lithium-sulfur batteries, less attention has been paid to the cathode porosity, which is much higher in sulfur/carbon composite cathodes than in traditional lithium-ion battery electrodes. For high-energy lithium-sulfur batteries, a dense electrode with low porosity is desired to minimize electrolyte intake, parasitic weight, and cost. Here we report the profound impact on the discharge polarization, reversible capacity, and cell cycling life of lithium-sulfur batteries by decreasing cathode porosities from 70 to 40%. According to the developed mechanism-based analytical model, we demonstrate that sulfur utilization is limited by the solubility of lithium-polysulfides and further conversion from lithium-polysulfides to Li2S is limited by the electronically accessible surface area of the carbon matrix. Finally, we predict an optimized cathode porosity to maximize the cell level volumetric energy density without sacrificing the sulfur utilization.
Jean-charles Motte - One of the best experts on this subject based on the ideXlab platform.
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substrate milling pretreatment as a Key Parameter for solid state anaerobic digestion optimization
Bioresource Technology, 2014Co-Authors: Jean-charles Motte, Renaud Escudie, Jérôme Hamelin, Jean-philippe Steyer, Nicolas Bernet, Jean-philippe Delgenès, Claire DumasAbstract:The effect of milling pretreatment on performances of Solid-State Anaerobic Digestion (SS-AD) of raw lignocellulosic residue is still controverted. Three batch reactors treating different straw particle sizes (milled 0.25 mm, 1 mm and 10 mm) were followed during 62 days (6 sampling dates). Although a fine milling improves substrate accessibility and conversion rate (up to 30% compared to coarse milling), it also increases the risk of media acidification because of rapid and high acids production during fermentation of the substrate soluble fraction. Meanwhile, a gradual adaptation of microbial communities, were observed according to both reaction progress and methanogenic performances. The study concluded that particle size reduction affected strongly the performances of the reaction due to an increase of substrate bioaccessibility. An optimization of SS-AD processes thanks to particle size reduction could therefore be applied at farm or industrial scale only if a specific management of the soluble compounds is established.
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total solids content a Key Parameter of metabolic pathways in dry anaerobic digestion
Biotechnology for Biofuels, 2013Co-Authors: Jean-charles Motte, Eric Trably, Renaud Escudie, Jérôme Hamelin, Jean-philippe Steyer, Nicolas Bernet, Jean-philippe Delgenès, Claire DumasAbstract:Background In solid-state anaerobic digestion (AD) bioprocesses, hydrolytic and acidogenic microbial metabolisms have not yet been clarified. Since these stages are particularly important for the establishment of the biological reaction, better knowledge could optimize the process performances by process Parameters adjustment.
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Total solids content: a Key Parameter of metabolic pathways in dry anaerobic digestion.
Biotechnology for Biofuels, 2013Co-Authors: Jean-charles Motte, Eric Trably, Renaud Escudie, Jérôme Hamelin, Jean-philippe Steyer, Nicolas Bernet, Jean-philippe Delgenès, Claire DumasAbstract:In solid-state anaerobic digestion (AD) bioprocesses, hydrolytic and acidogenic microbial metabolisms have not yet been clarified. Since these stages are particularly important for the establishment of the biological reaction, better knowledge could optimize the process performances by process Parameters adjustment. This study demonstrated the effect of total solids (TS) content on microbial fermentation of wheat straw with six different TS contents ranging from wet to dry conditions (10 to 33% TS). Three groups of metabolic behaviors were distinguished based on wheat straw conversion rates with 2,200, 1,600, and 1,400 mmol.kgVS-1 of fermentative products under wet (10 and 14% TS), dry (19 to 28% TS), and highly dry (28 to 33% TS) conditions, respectively. Furthermore, both wet and dry fermentations showed acetic and butyric acid metabolisms, whereas a mainly butyric acid metabolism occurred in highly dry fermentation. Substrate conversion was reduced with no changes of the metabolic pathways until a clear limit at 28% TS content, which corresponded to the threshold value of free water content of wheat straw. This study suggested that metabolic pathways present a limit of TS content for high-solid AD.
