Regularities of ionic solvation and association of lithium difluoro(oxalate)borate in dimethyl carbonate and sulfolane solvent systems

被引：0
作者：
Jian Li
Pengyu Meng
Hongming Zhou
机构：
[1] Central South University,School of Materials Science and Engineering
[2] Hunan Zhengyuan Institute for Energy Storage Materials and Devices,undefined
来源：
Ionics | 2018年 / 24卷
关键词：
Lithium difluoro(oxalate)borate; Ionic solvation; Ionic association; Raman spectroscopy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Lithium difluoro(oxalate)borate (LiODFB) is acknowledged as a new type of electrolyte lithium salt with great potential for high-voltage lithium-ion batteries. Utilizing Raman spectroscopy, a conductivity tester, and a viscometer, this study concentrates on the solution structures and properties of LiODFB-solvent systems. The results demonstrated that in the sulfolane (SL) solvent, the main coordination form is among the Li+ cation. The ODFB− anion and SL molecules form an ionic solvation as a contact ion pair (CIP). The content of free Li+ cations is very considerable, which is beneficial to improve the solubility and conductivity of LiODFB in the SL solvent. In the dimethyl carbonate (DMC) solvent, the main coordination form is ionic association as an aggregate (AGG). In addition, the solvent can display the comprehensive superiority of the SL solvent and LiODFB salt when a high concentration is dissolved in the SL-DMC as a mixed solvent.
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页码：2147 / 2155
页数：8
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