Ion Speciation and Transport Properties of LiTFSI in 1,3-Dioxolane Solutions: A Case Study for Li-S Battery Applications.
Ion Speciation and Transport Properties of LiTFSI in 1,3-Dioxolane Solutions: A Case Study for Li-S Battery Applications.
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1,3-二氧戊环溶液中 LiTFSI 的离子形态和传输特性：锂硫电池应用案例研究。
DOI：
10.1021/acs.jpcb.7b09614
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Raccichini R
中科院分区：
文献类型：
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作者：
Raccichini R
锂硫电池因其较高的理论比容量和固有的低成本，被认为是后锂离子电池的主要候选电池之一。电解液在这个系统中的作用尤其重要，据报道，通过调节电解液中的盐量，电池性能显著。为了进一步了解这些改进的原因，我们选择了1，3-二氧杂环戊烷电解液中的双(三氟甲磺酰基)亚胺锂作为模型盐-溶剂体系，系统地研究了从10-5到5M的广泛浓度范围内的电导率和粘度。根据电解液电导理论对实验结果进行了讨论和解释，得出的结论是：在1.25m处达到最大摩尔电导率之前，三离子的形成是最高摩尔电导率的原因。在较高的浓度下，由于粘度的迅速增加，摩尔电导率迅速下降，盐-溶剂体系可以被视为熔盐的稀释形式。
Lithium–sulfur battery is considered to be one of the main candidates for “post-lithium-ion” battery generation because of its high theoretical specific capacity and inherently low cost. The role of electrolyte is particularly important in this system, and remarkable battery performances have been reported by tuning the amount of salt in the electrolyte. To further understand the reasons for such improvements, we chose the lithium bis(trifluoromethanesulfonyl)imide in 1,3-dioxolane electrolyte as a model salt–solvent system for a systematic study of conductivity and viscosity over a wide range of concentration from 10–5up to 5m. The experimental results, discussed and interpreted with reference to the theory of electrolyte conductance, lead to the conclusion that triple ion formation is responsible for the highest molal conductivity values before reaching the maximum at 1.25m. At higher concentrations, the molal conductivity drops quickly because of a rapid increase in viscosity and the salt–solvent system can be treated as a diluted form of molten salt.