Li ion conducting polymer gel electrolytes based on ionic liquid/PVDF-HFP blends
Li ion conducting polymer gel electrolytes based on ionic liquid/PVDF-HFP blends
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DOI：
10.1149/1.2779962
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发表时间：
2007-01-01
影响因子：
3.9
通讯作者：
Greenbaum, Steve G.
中科院分区：
文献类型：
--
作者：
Ye, Hui;Huang, Jian;Greenbaum, Steve G.
与金属锂化学相容的离子液体在可充电锂电池中的应用是非常有前景的。本研究筛选出1-甲基-3-丙基吡咯烷双（三氟甲磺酰基）酰亚胺（P13 TFSI）作为一种特别有前途的离子液体。将锂酰亚胺盐（LiTFSI）溶于P13 TFSI离子液体中，再与聚偏乙烯-六氟丙烯共聚物（PVDF-HFP）混合，合成了具有高电化学稳定性、高离子电导率、弹性、柔韧性、非挥发性的聚合物凝胶电解质（PGE）。向聚合物凝胶电解质中添加少量碳酸亚乙酯显著改善了这些电解质的离子电导率、净Li离子传输浓度和Li离子传输动力学。因此，它们是有利的，并且在应用于可再充电Li电池（包括开放系统如Li/空气电池）以及更“常规”的可再充电锂和锂离子电池中提供了良好的前景。
Ionic liquids thermodynamically compatible with Li metal are very promising for applications to rechargeable lithium batteries. 1-methyl-3-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (P13TFSI) is screened out as a particularly promising ionic liquid in this study. Dimensionally stable, elastic, flexible, nonvolatile polymer gel electrolytes (PGEs) with high electrochemical stabilities, high ionic conductivities and other desirable properties have been synthesized by dissolving Li imide salt (LiTFSI) in P13TFSI ionic liquid and then mixing the electrolyte solution with poly(vinylidene-co-hexafluoropropylene) (PVDF-HFP) copolymer. Adding small amounts of ethylene carbonate to the polymer gel electrolytes dramatically improves the ionic conductivity, net Li ion transport concentration, and Li ion transport kinetics of these electrolytes. They are thus favorable and offer good prospects in the application to rechargeable Li batteries including open systems like Li/air batteries, as well as more "conventional" rechargeable lithium and lithium ion batteries.