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Synthesis and Structural Characterizations of a New lithium salt for lithium-ion Batteries

Chinese Journal of Structural Chemistry 2015年第8期34卷 1197-1202页

作者： JIA Guo-Feng LI Fa-Qiang PENG Zheng-Jun ZHU Zeng-Hu GONG Yan WANG Qing-Lei Qinghai Institute of salt Lakes Chinese Academy of Sciences College of Chemistry and Chemical Engineering Central South University University of Chinese Academy of Sciences

A novel crystal [（CH3O）2CO]3Li2[C2BF2O4]2 was synthesized and fully characterized by FT-IR and single-crystal X-ray diffraction analysis. It crystallizes in monoclinic system, P2Jn space group, with a = 8.1749（2）, b = 10.7449（2）, c = 12.8665（3） A, βl = 94.654（2）°, V= 1126.45（4） A3, Z = 2, Dc = 1.644 g/cm, F（000） = 568, p = 1.498 mm^-1, Mr= 557.77 g/mol, the final R = 0.0334 and wR = 0.0903. The structure analysis revealed that each Li atom is three-coordinated and adopts 1.5 O atoms of two different dimethyl carbonates and one O atom of C2BF2O4-. Thermal stability and infrared spectra analysis were studied and discussed.

关键词： lithium salt solid-organic solvent synthesis crystallization crystal structure,lithium-ion battery

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Effect of the anionic composition of sulfolane based electrolytes on the performances of lithium-sulfur batteries

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Journal of Energy Chemistry 2024年第8期95卷 231-240,I0005页

作者： Elena V.Karaseva Elena V.Kuzmina Bo-Quan Li Qiang Zhang Vladimir S.Kolosnitsyn Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Science 71Prospect OktyabryaUfa 450054BashkortostanRussia Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

In lithium-sulfur batteries,cell design,specifically electrolyte design,has a key impact on the battery *** effect of lithium salt anion donor number(DN)(DN[PF_(6)]^(-)=2.5,DN[N(SO_(2)CF_(3))_(2)]^(-)=5.4,DN[ClO_(4)]^(-)=8.4,DN[SO_(3)CF_(3)]^(-)=16.9,and DN[NO_(3)]^(-)=21.1)on the patterns of lithium-sulfur batteries and lithium metal electrode performances with sulfola ne-based electrolytes is *** increase in DN of lithium salt anions leads to an increase in the depth and rate of electrochemical reduction of sulfur and long-chain lithium polysulfides and to a decrease in those for medium-and short-chain lithium *** of lithium salt anions has weak effect on the discharge capacity of lithium-sulfur batteries and the Coulomb efficiency during cycling,with the exception of LiSO_(3)CF_(3)and LiNO_(3).An increase in DN of lithium salt anions leads to an increase in the cycling duration of lithium metal anodes and to a decrease in the presence of lithium *** sulfolane solutions of LiNO_(3)and LiSO_(3)CF_(3),lithium polysulfides do not affect the cycling duration of lithium metal anodes.

关键词： Donor number lithium salt Sulfolane lithium polysulfide Electrolyte lithium-sulfur battery lithium metal electrode

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Recovering the electrochemical window by forming a localized solvation nanostructure in ionic liquids with trace water

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Science China Chemistry 2022年第1期65卷 96-105页

作者： Jianing Meng Meng Ye Yue Wang Yinglun Sun Xu Zhang Kaiyuan Shi Xingbin Yan School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Petrochemical Engineering Lanzhou University of TechnologyLanzhou 730050China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

Motivated by the fascinating merits of wide electrochemical stability window(ESW)and nonflammability,ionic liquids(ILs)have been utilized as advanced electrolytes in various emerging electrochemical energy storage ***,ILs are hygroscopic to the water in the air and the presence of trace water will narrow the ESW of *** this article,we report that a localized solvation nanostructure(LSNS)is formed in ILs,which plays an important role in fully recovering the originally decreased ESW of[EMIM][TFSI]IL owing to the trace *** LSNS is consisted of Li^(+)ions with water molecules as the center,TFSI-anions as the secondary periphery and EMIM^(+)cations as the outermost layer after adding the proper amount of *** nanostructure can restrain the possibility of trace water to approach the electrode/electrolyte interfaces and adverse redox reactions,thereby recovering the ***,the effectiveness of this strategy in different kinds of ILs to fully recover ESW decreasing is *** article comes up with a feasible method to eliminate the trace water caused ESW drop for ILbased electrolytes and provides a new insight for understanding the molecular-level interaction between different ions in ILs with water molecules.

关键词： supercapacitor ionic liquid electrochemical window lithium salt trace water

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Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl＋MgCl2＋Li2SO4＋MgSO4＋H2O at 348.15 K and 0.1 MPa

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Chemical Research in Chinese Universities 2018年第5期34卷 798-802页

作者： YU Xiaoping WANG Qin GUO Yafei DENG Tianlong Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials Science Tianjin University of Science and Technology Tianjin 300457 P. R. China College of Chemistry and A laterials Science Northwest University Xi 'an 710127 P. R. China

The metastable solubilities and the physicochemical properties including density and pH of the reciprocal quaternary system（LiCl＋MgCl2＋Li2SO4＋MgSO4＋H2O） at 348.15 K and 0.1 MPa were determined using the isother- mal evaporation method. The dry-salt diagram and water-phase diagram were plotted based on the experimental data. There are five invariant points, eleven tmivariant curves, and seven crystallization zones corresponding to hexahy- drite, tetrahydrite, kieserite, bischofite, lithium sulfate monohydrate, lithium chloride monohydrate and lithium car- nallite. Comparison between the stable and metastable diagrams at 348.15 K indicates that the metastable phenome- non of magnesium sulfate is obvious, and the crystallization regions of hexahydrite and tetrahydrite disappear in the stable phase diagram. A comparison of the metastable dry-salt phase diagrams at 308.15, 323.15 and 348.15 K shows that with the increasing of temperatttre the epsomite crystallization zone disappears from the dry-salt phase diagranl of 303.15 K, and a new kieserite crystallization zone is presented at 348.15 K. The density and pH in the metastable equilibrium solution present regular change with the increasing of Janecke index J（2Li＋）, and the calculated densities using the empirical equation agree well with the experimental values.

关键词： Phase equilibrium Phase diagram Solubility Quaternary system lithium salt

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