The Experts below are selected from a list of 117 Experts worldwide ranked by ideXlab platform
J R Dahn - One of the best experts on this subject based on the ideXlab platform.
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mechanism of action of ethylene sulfite and vinylene carbonate electrolyte additives in lini1 3mn1 3co1 3o2 graphite pouch cells electrochemical gc ms and xps analysis
Physical Chemistry Chemical Physics, 2015Co-Authors: Lenaic Madec, R Petibon, Ian G Hill, K Tasaki, J R DahnAbstract:The role of ethylene sulfite used either alone or in combination with VC in LiNi1/3Mn1/3Co1/3O2 (NMC)/graphite pouch cells was studied by Correlating Data from differential capacity (dQ/dV) analysis, gas chromatography/mass spectroscopy (GC-MS), theoretical calculations, ultrahigh precision coulometry, storage experiments and X-ray photoelectron spectroscopy. For cells containing VC alone, the electrochemical performance and gas production were greatly improved, compared to cells without VC, due to the formation of more stable and protective SEI films at both electrode surfaces by a polymer of VC. For cells with ES alone, a vigorous reactivity was observed due to preferential reduction that also generated large amounts of gas during formation. The dramatic decrease in electrochemical performance as well as the continuous production of gas during cycling in cells with ES was explained by the formation of a very thin and ineffective SEI film at the NMC surface. The suppression of the vigorous reaction of ES in cells with both ES and VC occurred because the solvation energy of Li+ by VC is smaller than that of EC so VC is reduced first during formation. During charge–discharge cycling, a slow consumption of ES occurred and different sulfur species were observed on the electrodes when VC was combined with ES. SEI film formation processes and SEI composition were therefore dominated by VC and the electrochemical performance of cells with both VC and ES were similar compared to those of cells with VC alone.
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effect of sulfate electrolyte additives on lini1 3mn1 3co1 3o2 graphite pouch cell lifetime correlation between xps surface studies and electrochemical test results
Journal of Physical Chemistry C, 2014Co-Authors: Lenaic Madec, Jian Xia, R Petibon, K J Nelson, Jonpaul Sun, Ian G Hill, J R DahnAbstract:The role of two homologous cyclic sulfate electrolyte additives, trimethylene sulfate (or 1,3,2-dioxathiane-2,2-dioxide, TMS) and ethylene sulfate (or 1,3,2-dioxathiolane-2,2-dioxide, DTD), used either alone or in combination with vinylene carbonate (VC) on the lifetime of LiNi1/3Mn1/3Co1/3O2(NMC)/graphite pouch cells was studied by Correlating Data from gas chromatography/mass spectroscopy (GC–MS), dQ/dV analysis, ultrahigh precision coulometry, storage experiments, and X-ray photoelectron spectroscopy. For VC alone, more stable and protective SEI films were observed at the surface of both electrodes due to the formation of a polymer of VC, which results in higher capacity retention. For TMS, similar chemical SEI compositions were found compared to the TMS-free electrolytes. When VC was added to TMS, longer cell lifetime is attributed to VC. For DTD, a cell lifetime that competes with VC was explained by a preferential reduction potential and a much higher fraction of organic compounds in the SEI films. ...
Lenaic Madec - One of the best experts on this subject based on the ideXlab platform.
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mechanism of action of ethylene sulfite and vinylene carbonate electrolyte additives in lini1 3mn1 3co1 3o2 graphite pouch cells electrochemical gc ms and xps analysis
Physical Chemistry Chemical Physics, 2015Co-Authors: Lenaic Madec, R Petibon, Ian G Hill, K Tasaki, J R DahnAbstract:The role of ethylene sulfite used either alone or in combination with VC in LiNi1/3Mn1/3Co1/3O2 (NMC)/graphite pouch cells was studied by Correlating Data from differential capacity (dQ/dV) analysis, gas chromatography/mass spectroscopy (GC-MS), theoretical calculations, ultrahigh precision coulometry, storage experiments and X-ray photoelectron spectroscopy. For cells containing VC alone, the electrochemical performance and gas production were greatly improved, compared to cells without VC, due to the formation of more stable and protective SEI films at both electrode surfaces by a polymer of VC. For cells with ES alone, a vigorous reactivity was observed due to preferential reduction that also generated large amounts of gas during formation. The dramatic decrease in electrochemical performance as well as the continuous production of gas during cycling in cells with ES was explained by the formation of a very thin and ineffective SEI film at the NMC surface. The suppression of the vigorous reaction of ES in cells with both ES and VC occurred because the solvation energy of Li+ by VC is smaller than that of EC so VC is reduced first during formation. During charge–discharge cycling, a slow consumption of ES occurred and different sulfur species were observed on the electrodes when VC was combined with ES. SEI film formation processes and SEI composition were therefore dominated by VC and the electrochemical performance of cells with both VC and ES were similar compared to those of cells with VC alone.
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effect of sulfate electrolyte additives on lini1 3mn1 3co1 3o2 graphite pouch cell lifetime correlation between xps surface studies and electrochemical test results
Journal of Physical Chemistry C, 2014Co-Authors: Lenaic Madec, Jian Xia, R Petibon, K J Nelson, Jonpaul Sun, Ian G Hill, J R DahnAbstract:The role of two homologous cyclic sulfate electrolyte additives, trimethylene sulfate (or 1,3,2-dioxathiane-2,2-dioxide, TMS) and ethylene sulfate (or 1,3,2-dioxathiolane-2,2-dioxide, DTD), used either alone or in combination with vinylene carbonate (VC) on the lifetime of LiNi1/3Mn1/3Co1/3O2(NMC)/graphite pouch cells was studied by Correlating Data from gas chromatography/mass spectroscopy (GC–MS), dQ/dV analysis, ultrahigh precision coulometry, storage experiments, and X-ray photoelectron spectroscopy. For VC alone, more stable and protective SEI films were observed at the surface of both electrodes due to the formation of a polymer of VC, which results in higher capacity retention. For TMS, similar chemical SEI compositions were found compared to the TMS-free electrolytes. When VC was added to TMS, longer cell lifetime is attributed to VC. For DTD, a cell lifetime that competes with VC was explained by a preferential reduction potential and a much higher fraction of organic compounds in the SEI films. ...
R Petibon - One of the best experts on this subject based on the ideXlab platform.
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mechanism of action of ethylene sulfite and vinylene carbonate electrolyte additives in lini1 3mn1 3co1 3o2 graphite pouch cells electrochemical gc ms and xps analysis
Physical Chemistry Chemical Physics, 2015Co-Authors: Lenaic Madec, R Petibon, Ian G Hill, K Tasaki, J R DahnAbstract:The role of ethylene sulfite used either alone or in combination with VC in LiNi1/3Mn1/3Co1/3O2 (NMC)/graphite pouch cells was studied by Correlating Data from differential capacity (dQ/dV) analysis, gas chromatography/mass spectroscopy (GC-MS), theoretical calculations, ultrahigh precision coulometry, storage experiments and X-ray photoelectron spectroscopy. For cells containing VC alone, the electrochemical performance and gas production were greatly improved, compared to cells without VC, due to the formation of more stable and protective SEI films at both electrode surfaces by a polymer of VC. For cells with ES alone, a vigorous reactivity was observed due to preferential reduction that also generated large amounts of gas during formation. The dramatic decrease in electrochemical performance as well as the continuous production of gas during cycling in cells with ES was explained by the formation of a very thin and ineffective SEI film at the NMC surface. The suppression of the vigorous reaction of ES in cells with both ES and VC occurred because the solvation energy of Li+ by VC is smaller than that of EC so VC is reduced first during formation. During charge–discharge cycling, a slow consumption of ES occurred and different sulfur species were observed on the electrodes when VC was combined with ES. SEI film formation processes and SEI composition were therefore dominated by VC and the electrochemical performance of cells with both VC and ES were similar compared to those of cells with VC alone.
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effect of sulfate electrolyte additives on lini1 3mn1 3co1 3o2 graphite pouch cell lifetime correlation between xps surface studies and electrochemical test results
Journal of Physical Chemistry C, 2014Co-Authors: Lenaic Madec, Jian Xia, R Petibon, K J Nelson, Jonpaul Sun, Ian G Hill, J R DahnAbstract:The role of two homologous cyclic sulfate electrolyte additives, trimethylene sulfate (or 1,3,2-dioxathiane-2,2-dioxide, TMS) and ethylene sulfate (or 1,3,2-dioxathiolane-2,2-dioxide, DTD), used either alone or in combination with vinylene carbonate (VC) on the lifetime of LiNi1/3Mn1/3Co1/3O2(NMC)/graphite pouch cells was studied by Correlating Data from gas chromatography/mass spectroscopy (GC–MS), dQ/dV analysis, ultrahigh precision coulometry, storage experiments, and X-ray photoelectron spectroscopy. For VC alone, more stable and protective SEI films were observed at the surface of both electrodes due to the formation of a polymer of VC, which results in higher capacity retention. For TMS, similar chemical SEI compositions were found compared to the TMS-free electrolytes. When VC was added to TMS, longer cell lifetime is attributed to VC. For DTD, a cell lifetime that competes with VC was explained by a preferential reduction potential and a much higher fraction of organic compounds in the SEI films. ...
Ian G Hill - One of the best experts on this subject based on the ideXlab platform.
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mechanism of action of ethylene sulfite and vinylene carbonate electrolyte additives in lini1 3mn1 3co1 3o2 graphite pouch cells electrochemical gc ms and xps analysis
Physical Chemistry Chemical Physics, 2015Co-Authors: Lenaic Madec, R Petibon, Ian G Hill, K Tasaki, J R DahnAbstract:The role of ethylene sulfite used either alone or in combination with VC in LiNi1/3Mn1/3Co1/3O2 (NMC)/graphite pouch cells was studied by Correlating Data from differential capacity (dQ/dV) analysis, gas chromatography/mass spectroscopy (GC-MS), theoretical calculations, ultrahigh precision coulometry, storage experiments and X-ray photoelectron spectroscopy. For cells containing VC alone, the electrochemical performance and gas production were greatly improved, compared to cells without VC, due to the formation of more stable and protective SEI films at both electrode surfaces by a polymer of VC. For cells with ES alone, a vigorous reactivity was observed due to preferential reduction that also generated large amounts of gas during formation. The dramatic decrease in electrochemical performance as well as the continuous production of gas during cycling in cells with ES was explained by the formation of a very thin and ineffective SEI film at the NMC surface. The suppression of the vigorous reaction of ES in cells with both ES and VC occurred because the solvation energy of Li+ by VC is smaller than that of EC so VC is reduced first during formation. During charge–discharge cycling, a slow consumption of ES occurred and different sulfur species were observed on the electrodes when VC was combined with ES. SEI film formation processes and SEI composition were therefore dominated by VC and the electrochemical performance of cells with both VC and ES were similar compared to those of cells with VC alone.
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effect of sulfate electrolyte additives on lini1 3mn1 3co1 3o2 graphite pouch cell lifetime correlation between xps surface studies and electrochemical test results
Journal of Physical Chemistry C, 2014Co-Authors: Lenaic Madec, Jian Xia, R Petibon, K J Nelson, Jonpaul Sun, Ian G Hill, J R DahnAbstract:The role of two homologous cyclic sulfate electrolyte additives, trimethylene sulfate (or 1,3,2-dioxathiane-2,2-dioxide, TMS) and ethylene sulfate (or 1,3,2-dioxathiolane-2,2-dioxide, DTD), used either alone or in combination with vinylene carbonate (VC) on the lifetime of LiNi1/3Mn1/3Co1/3O2(NMC)/graphite pouch cells was studied by Correlating Data from gas chromatography/mass spectroscopy (GC–MS), dQ/dV analysis, ultrahigh precision coulometry, storage experiments, and X-ray photoelectron spectroscopy. For VC alone, more stable and protective SEI films were observed at the surface of both electrodes due to the formation of a polymer of VC, which results in higher capacity retention. For TMS, similar chemical SEI compositions were found compared to the TMS-free electrolytes. When VC was added to TMS, longer cell lifetime is attributed to VC. For DTD, a cell lifetime that competes with VC was explained by a preferential reduction potential and a much higher fraction of organic compounds in the SEI films. ...
Sui Huang - One of the best experts on this subject based on the ideXlab platform.
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single cell gene expression profiling and cell state dynamics collecting Data Correlating Data points and connecting the dots
Current Opinion in Biotechnology, 2016Co-Authors: Carsten Marr, Joseph X Zhou, Sui HuangAbstract:Single-cell analyses of transcript and protein expression profiles-more precisely, single-cell resolution analysis of molecular profiles of cell populations-have now entered the center stage with widespread applications of single-cell qPCR, single-cell RNA-Seq and CyTOF. These high-dimensional population snapshot techniques are complemented by low-dimensional time-resolved, microscopy-based monitoring methods. Both fronts of advance have exposed a rich heterogeneity of cell states within uniform cell populations in many biological contexts, producing a new kind of Data that has triggered computational analysis methods for Data visualization, dimensionality reduction, and cluster (subpopulation) identification. The next step is now to go beyond collecting Data and Correlating Data points: to connect the dots, that is, to understand what actually underlies the identified Data patterns. This entails interpreting the 'clouds of points' in state space as a manifestation of the underlying molecular regulatory network. In that way control of cell state dynamics can be formalized as a quasi-potential landscape, as first proposed by Waddington. We summarize key methods of Data acquisition and computational analysis and explain the principles that link the single-cell resolution measurements to dynamical systems theory.
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single cell gene expression profi ling and cell state dynamics collecting Data Correlating Data points and connecting the dots
bioRxiv, 2016Co-Authors: Carsten Marr, Joseph X Zhou, Sui HuangAbstract:Single-cell analyses of transcript and protein expression profiles - more precisely, single-cell resolution analysis of molecular profiles of cell populations - have now entered center stage with the wide application of single-cell qPCR, single-cell RNA-Seq and CytOF. These high-dimensional population snapshots techniques are complemented by low-dimensional time-resolved microscopy-based monitoring methods of individual cells. Both fronts of advance have exposed a rich heterogeneity of cell states within uniform cell populations in many biological contexts, producing a new kind of Data that has stimulated a series of computational analysis methods for Data visualization, dimensionality reduction, and "cluster"(subpopulation) identification. The next step is to go beyond collecting Data and Correlating Data points with computational analyses: to connect the dots, that is, to understand what actually underlies the identified Data patterns. This entails interpreting the "clouds of points", each representing a cell in state space, and their structure as manifestation of the regulation by the molecular network. This control of cell state dynamics can be formalized as a quasi-potential landscape, as first proposed by Waddington. We summarize not only key methods of Data acquisition and computational analysis but also explain the principles that link the single-cell resolution measurements to dynamical systems theory.
