Influence of Solvent System on the Electrochemical Properties of a closo-Borate Electrolyte Salt
Influence of Solvent System on the Electrochemical Properties of a closo-Borate Electrolyte Salt
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DOI：
10.3390/app12052273
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
M. Green;Hovnan Simonyan;Katty Kaydanik;J. Teprovich
中科院分区：
文献类型：
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作者：
M. Green;Hovnan Simonyan;Katty Kaydanik;J. Teprovich
在这项研究中，使用一个封闭的硼酸盐作为锂离子电池（LIB）的电解质进行了评估，在一系列的溶剂系统。锂闭硼酸盐是一类独特的无卤素盐，由于其化学和热稳定性，其具有提供优于目前在市售LIB中使用的卤化盐的一些优点的潜力。为了评估这一概念，用锂封闭硼酸盐制备三种不同的溶剂体系以制备液体电解质（碳酸亚丙酯、碳酸亚乙酯：碳酸二甲酯和1-丁基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺）。然后通过将它们与三种不同的电活性电极材料一起使用来比较含闭硼酸盐的电解质。还研究了它们在各种充放电速率下的循环稳定性和性能。基于对称电池和恒电流循环研究，确定基于碳酸盐的液体电解质比离子液体电解质表现更好。这一工作表明，无卤的闭硼酸盐是有趣的候选者，值得进一步研究作为锂离子电池的锂盐。
In this study, the use of a closo-borate salt as an electrolyte for lithium-ion batteries (LIB) was evaluated in a series of solvent systems. The lithium closo-borate salts are a unique class of halogen-free salts that have the potential to offer some advantages over the halogenated salts currently employed in commercially available LIB due to their chemical and thermal stability. To evaluate this concept, three different solvent systems were prepared with a lithium closo-borate salt to make a liquid electrolyte (propylene carbonate, ethylene carbonate:dimethyl carbonate, and 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide). The closo-borate containing electrolytes were then compared by utilizing them with three different electroactive electrode materials. Their cycle stability and performance at various charge/discharge rates was also investigated. Based on the symmetrical cell and galvanostaic cycling studies it was determined that the carbonate based liquid electrolytes performed better than the ionic liquid electrolyte. This work demonstrates that halogen free closo-borate salts are interesting candidates and worthy of further investigation as lithium salts for LIB.