具有亚磺酰官能化亚胺阴离子的离子液体及其锂电解质:(I)物理和电化学特性

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2024-07-18 DOI:10.1016/j.powera.2024.100154
Hao Wu , Kai Han , Weican Hu , Wenfang Feng , Michel Armand , Zhibin Zhou , Heng Zhang
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引用次数: 0

摘要

酰亚胺基离子液体(ILs)是构建更安全的电解质和更好的可充电电池的理想候选物质。本研究提出了一种亚磺酰官能化的亚胺阴离子--(三氟甲烷亚磺酰基)(三氟甲烷磺酰基)亚胺阴离子([(CF3SO) (CF3SO2)N]-,[qTFSI]-),作为构建低熔点离子液体和高性能电解质的负电荷。研究人员对基于[qTFSI]的离子交换树脂及其电解质的物理化学性质进行了广泛表征,并与经典的磺酰亚胺阴离子、双(三氟甲烷磺酰)亚胺阴离子([(CF3SO2)2N]-,[TFSI]-)参考体系进行了比较研究。研究发现,与参考的[TFSI]-阴离子相比,[qTFSI]-阴离子的负电荷分散程度较低,这也是 IL 阳离子与亚磺酰官能化阴离子之间相互作用略强的原因。与基于[TFSI]的离子相比,[qTFSI]-阴离子的不对称特征有助于降低相应离子醇的玻璃态和熔化态,从而有效地提高了充电电池的工作温度。此外,[qTFSI]- 与 [TFSI]- 的共同使用还能改善锂金属阳极与基于 IL 的电解质之间的电化学相容性,从而使锂离子对称电池保持更好的循环稳定性。目前的工作为设计界面友好型 IL 及其电解质的新阴离子提供了一种优雅的方法。
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Ionic liquids with sulfinyl-functionalized imide anion and their lithium electrolytes: (I) Physical and electrochemical properties

Imide-based ionic liquids (ILs) are intriguing candidates for constructing safer electrolytes and better rechargeable batteries. In this work, a sulfinyl-functionalized imide anion, (trifluoromethanesulfinyl) (trifluoromethanesulfonyl)imide anion ([(CF3SO) (CF3SO2)N], [qTFSI]), is proposed as negative charge for building low-melting ILs and high-performing electrolytes. The physicochemical properties of [qTFSI]-based ILs and their electrolytes are extensively characterized, and the reference systems with the classic sulfonimide anion, bis(trifluoromethanesulfonyl)imide anion ([(CF3SO2)2N], [TFSI]) are also comparatively investigated. It has been revealed that the [qTFSI] anion shows lesser extent of negative charge delocalization as compared to the reference [TFSI] anion, which is responsible for slightly stronger interactions between IL cations and the sulfinyl-functionalized anion. The asymmetric feature of the [qTFSI] anion contributes to lower glass and melting transitions of the corresponding ILs vs. [TFSI]-based ones, which effectively expands the operational temperature of the rechargeable batteries. Furthermore, the co-utilization of [qTFSI] with [TFSI] is found to improve the electrochemical compatibility of Li metal anode with the IL-based electrolytes, sustaining better cycling stability of the Li symmetric cells. The current work offers an elegant approach for the design of new anions for interface-favorable ILs and their electrolytes.

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CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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