Our society is critically dependent on lithium-ion batteries (LIBs) as a power source for portable electronic gadgets. One of the major problems with these batteries is the degradation of the materials inside them. In addition to the reduced cell life, building-up of these degraded products inside the cells is very detrimental to the safe operation. Herein, we report the synthesis and characterization of a novel thiourea-based room temperature ionic liquid (IL), 3-heptyl-1-(3-(3-heptyl-3-phenylthioureido)propyl)-1H-imidazole-3-ium hexafluorophosphate. Its electrochemical and thermal properties including transport phenomena have been studied. It is proposed to be used as a nominal additive to commercially used electrolytes, ethylene carbonate and di-methyl carbonate mixtures. The comparative performance characteristics of the LIBs in the presence and the absence of this IL additive have been demonstrated with a traditional lithium nickel cobalt manganese oxide cathode (NMC111), a graphite anode, and an ethylene carbonate and di-methyl carbonate (1:1, v/v) electrolyte. It is further demonstrated that use of this electrolyte additive in batteries helps to address some of the major concerns of the conventional electrolytes such as safety issues and cycling performance as well as coulombic efficiency with enhanced discharge capacities.

中文翻译：

---

新型硫脲基离子液体作为电解质添加剂，可改善电池安全性并增强锂离子电池的电化学性能。

我们的社会非常依赖锂离子电池（LIB）作为便携式电子产品的电源。这些电池的主要问题之一是其内部材料的降解。除了缩短电池寿命外，这些降解产物在电池内部的积聚也不利于安全操作。在这里，我们报告了新型的基于硫脲的室温离子液体（IL）3-庚基-1-（3-（3-（3-庚基-3-苯基硫脲基）丙基）-1 H的合成和表征-咪唑-3-六氟磷酸钾。已经研究了其电化学性质和热性质，包括传输现象。提议用作商业上使用的电解质，碳酸亚乙酯和碳酸二甲酯混合物的标称添加剂。使用传统的锂镍钴锰氧化物正极（NMC111），石墨负极以及碳酸亚乙酯和碳酸二甲酯（1：1）可以证明存在和不存在这种IL添加剂时LIB的比较性能特征，v / v）电解质。进一步证明，在电池中使用这种电解质添加剂有助于解决常规电解质的一些主要问题，例如安全性和循环性能以及具有增强的放电容量的库仑效率。