吡咯吡啶离子液体作为高性能锂/CFx电池电解质的多功能添加剂

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

摘要

锂/氟化碳（Li/CFx）电池因其超高能量密度和低自放电率而受到广泛关注。然而，CFx的C-F共价键的强大和放电产物氟化锂（LiF）的离子电导率不足限制了Li/CFx电池在高放电电流密度下的放电平台和能量密度。本研究开发了1,1-二甲基吡咯烷鎓四氟硼酸盐（DMP.BF4）作为LiBF4/PC/二甲醚电解质的添加剂，可显著提高Li/CFx电池的能量密度和倍率能力。锂/CFx电池与DMP。与使用初始电解质的电池（在0.01C时为2142 Wh kg - 1，在10C时为1288 Wh kg - 1）相比，BF4在0.01C时表现出较高的放电容量性能（933mAh g - 1, 2442 Wh kg - 1），在10C时表现出显著的高倍率性能（823mAh g - 1, 1722 Wh kg - 1）。发现DMP+与F的相互作用削弱了C-F键和Li-F键，形成DMP- lif配位化合物，加速了CFx阴极的放电速率和反应深度，最终提高了Li/CFx电池的容量和动力学性能。本研究为离子液体作为提高锂/CFx电池性能的多功能添加剂提供了一种有效而简便的策略。

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

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.