The beneficial effect of protic ionic liquids on the lithium environment in electrolytes for battery applications
The beneficial effect of protic ionic liquids on the lithium environment in electrolytes for battery applications
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质子离子液体对电池应用电解质中锂环境的有益影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Balducci
中科院分区：
文献类型：
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作者：
T. Vogl;S. Menne;R. Kühnel;A. Balducci
这项工作报告了通过用质子离子液体（PIL）替代传统的非质子离子液体（AIL）N-丁基-N-甲基吡咯烷鎓双（三氟甲磺酰基）亚胺（PYR14TFSI），提高了基于离子液体的锂离子电池的倍率性能。合成了两种模型吡咯烷鎓-TFSI PIL，并对其与双（三氟甲磺酰基）亚胺锂（LiTFSI）的混合物的电导率、粘度和自扩散系数进行了表征。拉曼测量显示 AIL 和 PIL 之间 TFSI− 与 Li+ 的配位存在显着差异。在所研究的 PIL 中，Li+ 与显着减少的 TFSI− 阴离子配位，这被认为是这些电解质中磷酸钒锂基电极倍率性能大幅提高的可能原因。
This work reports the improved rate performance of ionic-liquid based lithium-ion batteries by replacement of the conventional aprotic ionic liquid (AIL) N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) by protic ionic liquids (PILs). Two model pyrrolidinium-TFSI PILs are synthesized and their mixtures with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) are characterized in terms of conductivity, viscosity and self-diffusion coefficients. Raman measurements show pronounced differences in terms of TFSI− coordination to Li+ between the AIL and the PILs. Li+ is coordinated by significantly fewer TFSI− anions in the investigated PILs, which is discussed as the likely cause for the much improved rate performance of lithium vanadium phosphate-based electrodes in these electrolytes.