The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Li Cheng - One of the best experts on this subject based on the ideXlab platform.
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a study on Sulfites for lithium ion battery electrolytes
Journal of Power Sources, 2006Co-Authors: Bi Tao Yu, Fu Shen Li, Li ChengAbstract:Abstract Because of the similarity in the structures of organic Sulfites with those of organic carbonates, the applications of organic Sulfites for lithium-ion battery electrolytes were studied. The main differences in the bond lengths and the bond angles, which are resulted from the difference between carbon atom diameter and sulfur atom diameter, are analyzed. The physical properties of organic carbonates and organic Sulfites are compared. The results of cyclic voltammetry (CV) test show that the decomposition potentials of propylene sulfite (PS) and dimethyl sulfite (DMS) are much higher than 4.5 V, it is satisfied with the requirements as the solvents for lithium ion batteries. But the decomposition potentials of ethylene sulfite (ES) and diethyl sulfite (DES) are lower than 3.5 V, they can only be used as additives for lithium ion battery electrolytes. The results of charge–discharge tests show that both ES and PS have excellent film-forming properties; the performance of LiCoO 2 /graphite cell was improved evidently even with the ES addition as little as 0.3 wt.% in 1 mol L −1 LiPF 6 EC/DMC/DEC (1:2:2) electrolyte. DMS can improve both the conductivities of electrolytes and the capacities of batteries, therefore it is a good electrolyte co-solvent.
Vanessa Reich De Oliveira - One of the best experts on this subject based on the ideXlab platform.
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fluidized bed treatment of residues of semi dry flue gas desulfurization units of coal fired power plants for conversion of Sulfites to sulfates
Energy Conversion and Management, 2017Co-Authors: Rui De Paula Vieira De Castro, Jose Luiz De Medeiros, Ofelia De Queiroz Fernandes Araujo, Matheus De Andrade Cruz, Gabriel Travagini Ribeiro, Vanessa Reich De OliveiraAbstract:Abstract Coal-fired power plants with semi-dry flue gas desulfurization produce several metric tons per day of residues with 10–18%w/w of hemi-hydrated calcium sulfite. The rest of the 90–80%w/w of such residues contains silica, aluminium-silicates and calcium/magnesium carbonates, sulfates and hydroxides. This material could be added to cement, but Sulfites degrade the cement quality and lead to costs of landfill disposal. To test upgrading desulfurization residues to turn it into an acceptable cement feedstock, a pilot plant was built to oxidize residues with hot air converting Sulfites to sulfates. This pilot comprehends a fluidized bed reactor, an air heater, a cyclone and a heat recovery exchanger. Its operation showed that residues react favorably under fluidization. The effect of independent variables, residence time and temperature, was investigated and sulfite conversions up to 89.4% were observed. With statistical treatment of pilot experimental data, response surface of conversion of Sulfites to sulfates was developed, allowing to estimate the effect of independent coordinates on conversion and the optimal oxidation conditions. Experimental data and model predictions showed agreement leading to low estimated variance.
Martin Winter - One of the best experts on this subject based on the ideXlab platform.
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cyclic and acyclic Sulfites new solvents and electrolyte additives for lithium ion batteries with graphitic anodes
Journal of Power Sources, 2001Co-Authors: Gerhard Wrodnigg, Jurgen Besenhard, Martin WinterAbstract:Abstract The low viscosities of the linear Sulfites dimethyl sulfite and diethyl sulfite are suggesting an investigation of their suitability as low viscosity co-solvents for ethylene carbonate based electrolytes. In this study, electrochemical performances at graphitic anodes and conductivities in the temperature range −60 to +60°C are presented. Comparisons with the linear carbonates dimethyl carbonate and diethyl carbonate, which have been currently used as low viscosity solvents in lithium ion batteries, are made.
Peixin Li - One of the best experts on this subject based on the ideXlab platform.
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hydrothermal syntheses crystal structures and magnetic properties of two new mixed metal copper i Sulfites
Dalton Transactions, 2010Co-Authors: Peixin LiAbstract:Two new examples of mixed metal copper(I) Sulfites, namely, Na3Mn2Cu(SO3)4(H2O)5 (1) and NaMn4Cu(SO3)5(H2O)3 (2), have been synthesized and structurally characterized. The 1D structure of 1 is built from a chain of [Mn2Cu(SO3)4]3− bridged by Na+ ions whereas the structure of 2 features a complicated 3D framework in which Mn8O36 octanuclear clusters are bridged by sulfite anions and copper(I) ions into a 3D [CuMn4(SO3)5(H2O)3]2− network. The eight-coordinated sodium(I) ions are located at the cavities of the 3D structure. In both compounds, the oxygen atoms of the sulfite anion are bonded to Mn(II) ions whereas the sulfur atom is coordinated to the Cu+ ion. Magnetic measurements indicate that there exists antiferromagnetic interactions between Mn(II) centers in both compounds.
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new organically templated copper i Sulfites the role of sulfite anion as both soft and hard ligand
Inorganic Chemistry, 2007Co-Authors: Peixin Li, Hailong Jiang, Meiling FengAbstract:Two new organically templated layered copper(l) Sulfites, namely, {H(2)PiP}{Cu-3(CN)(3)(SO3)}(1) and {H(2)PiP}- NaCu2(SO3)2Br(H2O)center dot 2H(2)O (2) (pip = piperazine), have been synthesized by hydrothermal reactions of copper(1) cyanide or copper(l) bromide with NaHSO3 and piperazine. Both compounds exhibit a layered structure. The 2D layer of { Cu-3(CN)(3)(SO3)(2-) in 1 is composed of 1 D chains of copper(l) cyanide interconnected by sulfite anions via both Cu-S and Cu-O bonds, whereas the 2D layer of {NaCu2(SO3)(2)Br2- in 2 is formed by 1D chains of copper(l) bromide and 1D sodium(l) aqua chains that are interconnected by sulfite anions via Na-O, Cu-S, and Cu-O bonds. Chemical bonding in 1 and 2 has been also investigated by theoretical calculations based on DFT methods.
Bi Tao Yu - One of the best experts on this subject based on the ideXlab platform.
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a study on Sulfites for lithium ion battery electrolytes
Journal of Power Sources, 2006Co-Authors: Bi Tao Yu, Fu Shen Li, Li ChengAbstract:Abstract Because of the similarity in the structures of organic Sulfites with those of organic carbonates, the applications of organic Sulfites for lithium-ion battery electrolytes were studied. The main differences in the bond lengths and the bond angles, which are resulted from the difference between carbon atom diameter and sulfur atom diameter, are analyzed. The physical properties of organic carbonates and organic Sulfites are compared. The results of cyclic voltammetry (CV) test show that the decomposition potentials of propylene sulfite (PS) and dimethyl sulfite (DMS) are much higher than 4.5 V, it is satisfied with the requirements as the solvents for lithium ion batteries. But the decomposition potentials of ethylene sulfite (ES) and diethyl sulfite (DES) are lower than 3.5 V, they can only be used as additives for lithium ion battery electrolytes. The results of charge–discharge tests show that both ES and PS have excellent film-forming properties; the performance of LiCoO 2 /graphite cell was improved evidently even with the ES addition as little as 0.3 wt.% in 1 mol L −1 LiPF 6 EC/DMC/DEC (1:2:2) electrolyte. DMS can improve both the conductivities of electrolytes and the capacities of batteries, therefore it is a good electrolyte co-solvent.
