Effect of Ionic Liquids as Additives on Lithium Electrolytes: Conductivity, Electrochemical Stability, and Aluminum Corrosion†
Effect of Ionic Liquids as Additives on Lithium Electrolytes: Conductivity, Electrochemical Stability, and Aluminum Corrosion†
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离子液体作为添加剂对锂电解质的影响：电导率、电化学稳定性和铝腐蚀†
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
H. Gores
中科院分区：
文献类型：
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作者：
D. Moosbauer;Sandra Zugmann;M. Amereller;H. Gores
研究了8种离子液体(ILS)作为添加剂对锂盐基电解液电导率和电化学稳定性的影响。研究的盐是著名的六氟磷酸锂(LiPF6)，它是锂离子电池(LIB)的首选盐，以及新的盐二氟(草酸)硼酸锂(LiDFOB)。在(238.15至333.15)K温度范围内进行的电导率研究表明，几种IL添加剂引起的电导率随温度的增加而增加。测定了溶液在铂电极和铝电极上的电化学稳定性。在铂电极上，LiPF6是更稳定的盐，而在铝电极上，LiDFOB显示出比LiPF6溶液高0.5V的电势窗口。研究了添加离子液体对锂离子电池阴极集电体材料铝腐蚀的影响，未发现有任何不利影响。
We investigated the influence that eight ionic liquids (ILs) as additives have on the conductivity and electrochemical stability of lithium salt-based electrolytes. The investigated salts were the well-known lithium hexafluorophosphate (LiPF6), which is the preferred salt for lithium ion batteries (LIBs), and the new salt lithium difluoro(oxalato)borate (LiDFOB). Conductivity studies performed over the temperature range (238.15 to 333.15) K showed a temperature-dependent increase in conductivity caused by several IL additives. The electrochemical stabilities of the solutions were determined at platinum and aluminum electrodes. At the Pt electrode, LiPF6 is the more stable salt, whereas at the aluminum electrode, LiDFOB exhibits a 0.5 V higher potential window in comparison with LiPF6-based solutions. An investigation of the influence of added ILs on the corrosion of aluminum, the current collector material for cathodes of LIBs, did not reveal any adverse effects.