Enhancement of Functional Properties of Liquid Electrolytes for Lithium‐Ion Batteries by Addition of Pyrrolidinium‐Based Ionic Liquids with Long Alkyl‐Chains,Batteries & Supercaps

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Enhancement of Functional Properties of Liquid Electrolytes for Lithium‐Ion Batteries by Addition of Pyrrolidinium‐Based Ionic Liquids with Long Alkyl‐Chains
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-05-11 , DOI: 10.1002/batt.202000070
Arcangelo Celeste _{1,

2} , Laura Silvestri ₃ , Marco Agostini ₄ , Matthew Sadd ₄ , Stefano Palumbo ₁ , Jaya Kumar Panda ₁ , Aleksandar Matic ₄ , Vittorio Pellegrini ₁ , Sergio Brutti ₅

Affiliation

Three ionic liquid belonging to the N‐alkyl‐N‐methylpyrrolidinium bis(trifluoromethanesulfonyl) imides (Pyr₁,_nTFSI with n=4,5,8) have been added as co‐solvent to two commonly used electrolytes for Li‐ion cells: (a) 1 M lithium hexafluorophosphate (LiPF₆) in a mixture of ethylene carbonate (EC) and linear like dimethyl carbonate (DMC) in 1 : 1 v/v and (b) 1 M lithium bis‐(trifluoromethanesulfonyl)imide (LiTFSI) in EC : DMC 1 : 1 v/v. These electrolyte formulations (classified as P and T series containing LiPF₆ or LiTFSI salts, respectively) have been analyzed by comparing ionic conductivities, transport numbers, viscosities, electrochemical stability as well as vibrational properties. In the case of the Pyr_1,5TFSI and Pyr_1,8TFSI blended formulations, this is the first ever reported detailed study of their functional properties in Li‐ion cells electrolytes. Overall, P‐electrolytes demonstrate enhanced properties compared to the T‐ones. Among the various P electrolytes those containing Pyr_1,4TFSI and Pyr_1,5TFSI limit the accumulation of irreversible capacity upon cycling with satisfactory performance in lithium cells.

中文翻译：

通过添加吡咯烷鎓基离子液体和长烷基链增强锂离子电池液体电解质的功能特性

已将属于N-烷基-N-甲基吡咯烷鎓双（三氟甲磺酰基）酰亚胺的三种离子液体（Pyr ₁，_n TFSI，n = 4、5、8）作为助溶剂添加到两种常用的锂离子电池电解质中：（a）碳酸亚乙酯（EC）和线性碳酸二甲酯（DMC）的混合物中的1 M六氟磷酸锂（LiPF ₆）以1：1 v / v的比例混合；以及（b）1 M双（三氟甲磺酰基）酰亚胺锂（ EC：DMC 1：1 v / v中的LiTFSI）。这些电解质配方（分为LiPF ₆和P系列）分别通过比较离子电导率，传输数，粘度，电化学稳定性以及振动性能来分析）。对于Pyr _1,5 TFSI和Pyr _1,8 TFSI混合配方，这是有史以来首次报道的有关其在锂离子电池电解质中功能特性的详细研究。总体而言，与T型酮相比，P型电解液表现出增强的性能。在各种P电解质中，含有Pyr _1,4 TFSI和Pyr _1,5 TFSI的电解质限制了不可逆容量在循环时在锂电池中的令人满意的积累。

更新日期：2020-05-11

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