Pyrrolidinium ionic liquid as a multifunctional additive of electrolytes for superior Li/CFx batteries

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-01-09 DOI:10.1016/j.cej.2025.159325

Yan Wang, Yanbo Zhang, Kailimai Su, Yue Hu, Shusheng Xu, Junwei Lang

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引用次数: 0

Abstract

Lithium/fluorinated carbon (Li/CF_x) batteries have attracted wide attention due to their ultrahigh energy density and low self-discharge rate. However, robust C-F covalent bonds of CF_x and insufficient ionic conductivity of the discharge product lithium fluoride (LiF) limit the discharge platform and energy density of Li/CF_x batteries at high discharge current densities. Herein, 1,1-dimethylpyrrolidinium tetrafluoroborate (DMP.BF₄) is developed as an additive of the LiBF₄/PC/DME electrolyte to substantially promote the energy density and the rate capability of Li/CF_x batteries. The Li/CF_x battery with DMP.BF₄ exhibits high discharge capacity performance at 0.01C (933mAh g⁻¹, 2442 Wh kg⁻¹) and a remarkable high-rate capability at 10C (823mAh g⁻¹, 1722 Wh kg⁻¹), compared to the performance of battery using initial electrolyte (2142 Wh kg⁻¹ at 0.01C and 1288 Wh kg⁻¹ at 10C). It is found that the interaction between DMP⁺ and F weakens the C-F bond and Li-F bond, forms DMP-LiF coordination compound, accelerates the discharge rate and the reaction depth of the CF_x cathode, and finally improves the capacity and kinetics performance of Li/CF_x battery. This work provides an effective and facile strategy for ionic liquid as multifunctional additives to increase the performance of Li/CF_x batteries.

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.