Stabilized Electrode/Electrolyte Interphase by a Saturated Ionic Liquid Electrolyte for High-Voltage NMC532/Si-Graphite Cells

Liu, Qian; Jiang, Wei; Muñoz, María José Piernas; Liu, Yuzi; Yang, Zhenzhen; Bloom, Ira; Dzwiniel, Trevor L.; Li, Ying; Pupek, Krzysztof; Zhang, Zhengcheng

doi:10.1021/acsami.0c06038

Cited by 32 publications

(27 citation statements)

References 69 publications

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“…Under this background, there is no doubt that higher requirements have been put forward on the technology of lithium‐ion batteries. Therefore, how to increase the energy density of power batteries and extend the cruising range while ensuring safety and reducing the cost of batteries are the key problems that need to be solved urgently [5–9] . At present, the electrolyte used in commercial lithium‐ion batteries is composed of organic solvent dissolving LiPF 6 electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Tetraethylthiophene‐2,5‐diylbismethylphosphonate: A Novel Electrolyte Additive for High‐Voltage Batteries

et al. 2021

ChemSusChem

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In this work, a novel high‐voltage electrolyte additive, tetraethylthiophene‐2,5‐diylbismethylphosphonate (TTD), was synthesized, and the influence of TTD on the electrolyte and its electrochemical performance under different voltages were studied by changing the content of the TTD additive. The results showed that the TTD additive significantly improved the capacity, cycle stability, and rate capability of batteries when charging/discharging at high voltages. After adding 1 % TTD to the basic electrolyte, the capacity retention rate of batteries after 200 cycles at 4.2, 4.3, 4.4, and 4.5 V increased by 20.8, 18.3, 50, and 31.9 %, respectively. In addition, transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy (XPS) results showed that TTD could effectively inhibit the decomposition of the electrolyte and participate in the formation of a uniform, thin, and stable cathode electrolyte interphase (CEI) film on the electrode surface, thereby effectively inhibiting the side reaction between the electrolyte decomposition product and the CEI membrane, and finally improving the high‐voltage performance of the battery. The TTD additive may provide a cost‐effective solution for high‐performance high‐voltage electrolytes.

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Section: Introductionmentioning

confidence: 99%

Tetraethylthiophene‐2,5‐diylbismethylphosphonate: A Novel Electrolyte Additive for High‐Voltage Batteries

et al. 2021

ChemSusChem

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“…The exceptional cycling behaviour with highly concentrated electrolytes is commonly attributed to the lowering of mass transport limitations at the electrode due to the higher Li ion transport number and to a stable SEI. [23,24,[26][27][28] To this date, only a few studies deal with Si electrodes in such highly concentrated pyrrolidinium and phosphonium-based ILs [27,29]. We have previously shown in a short communication [27] the promising electrochemical performance of Si electrode in highly concentrated trimethyl isobutyl phosphonium (P 111i4 FSI)-LiFSI electrolyte, but a deeper understanding of such behaviour was not carried out.…”

Section: Introductionmentioning

confidence: 99%

Editors’ Choice—Understanding the Superior Cycling Performance of Si Anode in Highly Concentrated Phosphonium-Based Ionic Liquid Electrolyte

Araño

Mazouzi

Kerr

et al. 2020

J. Electrochem. Soc.

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Considerable effort has been devoted to improving the cyclability of silicon (Si) negative electrodes for lithium-ion batteries because it is a promising high specific capacity alternative to graphite. In this work, the electrochemical behaviour of Si in two ionic liquid (IL) electrolytes, triethyl(methyl)phosphonium bis(fluorosulfonyl)imide (P 1222 FSI) and N-propyl-Nmethylpyrrolidinium-FSI (C 3 mpyrFSI) with high and low lithium (Li) salt content is investigated at 50 °C. Results highlight that higher capacity and better cycling stability are achieved over 50 2 cycles with high salt concentration, the first time for a pyrrolidinium-based electrolyte in the area of Si negative electrodes. However, the Si cycling performance was far superior in the P 1222 FSIbased high salt content electrolyte compared to that of the C 3 mpyrFSI. To understand this unexpected result, diffusivity measurements of the IL-based electrolytes were performed using PFG-NMR, while their stability was probed using MAS-NMR and XPS after long-term cycling. A higher apparent transport number for Li ions in highly concentrated ILs, combined with a significantly lower extent of electrolyte degradation explains the superior cycle life of the highly concentrated phosphonium-based system. Si/concentrated P 1222 FSI-LiFSI/lithium nickel cobalt aluminum oxide (NCA) full cells with more than 3 mAh cm-2 nominal capacity deliver a promising cycle life and good rate capability.

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“…Thus, this IL can be used as a practical electrolyte additive for the next generation high-voltage LIBs. 47 …”

Section: Resultsmentioning

confidence: 99%

New Thiourea-Based Ionic Liquid as an Electrolyte Additive to Improve Cell Safety and Enhance Electrochemical Performance in Lithium-Ion Batteries

et al. 2020

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Our society is critically dependent on lithium-ion batteries (LIBs) as a power source for portable electronic gadgets. One of the major problems with these batteries is the degradation of the materials inside them. In addition to the reduced cell life, building-up of these degraded products inside the cells is very detrimental to the safe operation. Herein, we report the synthesis and characterization of a novel thiourea-based room temperature ionic liquid (IL), 3-heptyl-1-(3-(3-heptyl-3-phenylthioureido)propyl)-1 H -imidazole-3-ium hexafluorophosphate. Its electrochemical and thermal properties including transport phenomena have been studied. It is proposed to be used as a nominal additive to commercially used electrolytes, ethylene carbonate and di-methyl carbonate mixtures. The comparative performance characteristics of the LIBs in the presence and the absence of this IL additive have been demonstrated with a traditional lithium nickel cobalt manganese oxide cathode (NMC111), a graphite anode, and an ethylene carbonate and di-methyl carbonate (1:1, v/v) electrolyte. It is further demonstrated that use of this electrolyte additive in batteries helps to address some of the major concerns of the conventional electrolytes such as safety issues and cycling performance as well as coulombic efficiency with enhanced discharge capacities.

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Stabilized Electrode/Electrolyte Interphase by a Saturated Ionic Liquid Electrolyte for High-Voltage NMC532/Si-Graphite Cells

Cited by 32 publications

References 69 publications

Tetraethylthiophene‐2,5‐diylbismethylphosphonate: A Novel Electrolyte Additive for High‐Voltage Batteries

Tetraethylthiophene‐2,5‐diylbismethylphosphonate: A Novel Electrolyte Additive for High‐Voltage Batteries

Editors’ Choice—Understanding the Superior Cycling Performance of Si Anode in Highly Concentrated Phosphonium-Based Ionic Liquid Electrolyte

New Thiourea-Based Ionic Liquid as an Electrolyte Additive to Improve Cell Safety and Enhance Electrochemical Performance in Lithium-Ion Batteries

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