Ionic liquid electrolyte for room to intermediate temperature operating Li metal batteries: Dendrite suppression and improved performance

Hwang, Jinkwang; Okada, Haruki; Haraguchi, Ryutaro; Tawa, Shinya; Matsumoto, Kazuhiko; Hagiwara, Rika

doi:10.1016/j.jpowsour.2020.227911

Cited by 39 publications

(35 citation statements)

References 41 publications

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“…[54][55][56][57] In particular, [C2C1im][FSA] (C2C1im + : 1-ethyl-3-methylimidazolium) IL exhibits a high ionic conductivity in both ambient and elevated temperatures and is compatible with a wide range of electrode materials. 54,55,[58][59][60][61] Herein, for the first time, we assess the electrochemical performance of the ordered trirutile Li0.5FeF3 at elevated temperatures of 90 °C with the aid of the thermally stable Li[FSA]-[C2C1im][FSA] IL electrolyte. The ordered trirutile Li0.5FeF3 is prepared through high-energy ball milling followed by heat treatment at 400 °C.…”

Section: -Xfe IIImentioning

confidence: 99%

Phase Evolution of Trirutile Li_0.5FeF₃ for Lithium-Ion Batteries

et al. 2021

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Extensive studies on the trirutile Li0.5FeF3 phase have been commissioned in the context of Li-Fe-F system for Li-ion batteries. However, progress in electrochemical and structural studies have been greatly encumbered by the low electrochemical reactivity of this material. In order to advance this class of materials, a comprehensive study into the mechanisms of this phase is necessary. Therefore, herein, we report for the first-time overall reaction mechanisms of the ordered trirutile Li0.5FeF3 at elevated temperatures of 90 °C with the aid of a thermally stable ionic liquid electrolyte. The ordered trirutile Li0.5FeF3 is prepared by highenergy ball milling combined with heat treatment followed by electrochemical tests, X-ray diffraction, and X-ray absorption spectroscopic analyses. Our results reveal that a reversible topotactic Li + extraction/insertion from/into the trirutile structure occurs in a twophase reaction with a minor volume change (1.09 % between Li0.5FeF3 and Li0.11FeF3) in the voltage range of 3.2−4.3 V. Extension of the lower cut-off voltage to 2.5 V results in a conversion reaction to LiF and rutile FeF2 during discharging. The subsequent charge triggers the formation of the Li/Fe disordered trirutile structure at 4.3 V without showing the reconversion from LiF and rutile FeF2 to the ordered trirutile Li0.5FeF3 or FeF3.

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Section: -Xfe IIImentioning

confidence: 99%

Phase Evolution of Trirutile Li_0.5FeF₃ for Lithium-Ion Batteries

et al. 2021

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“…This observation is consistent with temperature dependence observed in some electrodes using ionic liquid electrolytes. [ 9,11,12,60–64 ]…”

Section: Resultsmentioning

confidence: 99%

“…It also highlights the functionality of ionic liquid electrolyte sodium batteries in severe temperature conditions. Although further studies using pouch‐ or 18650‐type full cells are required to fully understand practical cycle performance, the sufficient electrode behavior previously reported for some negative electrodes including hard carbon and some phosphide materials [ 7,63,73–76 ] in ionic liquid electrolytes suggest a high potential of this type battery.…”

Section: Resultsmentioning

confidence: 99%

Electrolytes toward High‐Voltage Na₃V₂(PO₄)₂F₃ Positive Electrode Durable against Temperature Variation

Hwang

Matsumoto

Hagiwara

2020

Advanced Energy Materials

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High power and energy density, long cyclability, and tolerance for wide temperature (seasonal and daily operational temperature differences) must be considered to construct large‐scale sodium secondary batteries. In this regard, Na3V2(PO4)2F3 (NVPF) has become a subject of interest as a high‐performance positive electrode material owing to its high energy density. However, the high operating voltage of NVPF causes continuous decomposition of electrolytes during cycles, resulting in significant capacity fading and low Coulombic efficiency. In this study, the electrochemical performance of the NVPF electrode in organic solvent electrolytes with and without additives and an ionic liquid is investigated at high voltage regimes over a wide temperature range (−20 °C to 90 °C). The results reveal that the performance of organic electrolytes is still insufficient even with additives, and the ionic liquid electrolyte demonstrates high electrochemical stability and cyclability with NVPF electrodes over a temperature range from −20 °C to 90 °C, achieving stable cycling over 500 cycles. The detailed electrochemical analysis combined with X‐ray photoelectron and energy dispersive X‐ray spectroscopy indicates that a sturdy cathode electrolyte interphase layer around the electrode protects it from capacity fading at high voltage and elevated temperature, resulting in high Coulombic efficiency.

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“…Dendritic growth during the plating process is regarded as the most serious obstacle for the practical applications of LMBs. [126][127][128][129][130] Therefore, a comprehensive understanding of the mechanism of Li dendrite nucleation and growth is necessary. Researchers have put great efforts into these problems and remarkable progress has been achieved until now.…”

Section: Importance Of Stripping Processmentioning

confidence: 99%

Mechanism understanding for stripping electrochemistry of Li metal anode

Jiang

Yang

et al. 2021

SusMat

105

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The pursuit of sustainable energy has a great request for advanced energy storage devices. Lithium metal batteries are regarded as a potential electrochemical storage system because of the extremely high capacity and the most negative electrochemical potential of lithium metal anode. Dead lithium formed in the stripping process significantly contributes to the low efficiency and short lifespan of rechargeable lithium metal batteries. This review displays a critical review on the current research status about the stripping electrochemistry of lithium metal anode. The significance of stripping process to a robust lithium metal anode is emphasized. The stripping models in different electrochemical scenarios are discussed. Specific attention is paid to the understanding for the electrochemical principles of atom diffusion, electrochemical reaction, ion diffusion in solid electrolyte interphase (SEI), and electron transfer with the purpose to strengthen the insights into the behavior of lithium electrode stripping. The factors affecting stripping processes and corresponding solutions are summarized and categorized as follows: surface physics, SEI, operational and external factors. This review affords fresh insights to explore the lithium anode and design robust lithium metal batteries based on the comprehensive understanding of the stripping electrochemistry.

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Ionic liquid electrolyte for room to intermediate temperature operating Li metal batteries: Dendrite suppression and improved performance

Cited by 39 publications

References 41 publications

Phase Evolution of Trirutile Li_0.5FeF₃ for Lithium-Ion Batteries

Phase Evolution of Trirutile Li_0.5FeF₃ for Lithium-Ion Batteries

Electrolytes toward High‐Voltage Na₃V₂(PO₄)₂F₃ Positive Electrode Durable against Temperature Variation

Mechanism understanding for stripping electrochemistry of Li metal anode

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Ionic liquid electrolyte for room to intermediate temperature operating Li metal batteries: Dendrite suppression and improved performance

Cited by 39 publications

References 41 publications

Phase Evolution of Trirutile Li0.5FeF3 for Lithium-Ion Batteries

Phase Evolution of Trirutile Li0.5FeF3 for Lithium-Ion Batteries

Electrolytes toward High‐Voltage Na3V2(PO4)2F3 Positive Electrode Durable against Temperature Variation

Mechanism understanding for stripping electrochemistry of Li metal anode

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Product

Resources

About

Phase Evolution of Trirutile Li_0.5FeF₃ for Lithium-Ion Batteries

Phase Evolution of Trirutile Li_0.5FeF₃ for Lithium-Ion Batteries

Electrolytes toward High‐Voltage Na₃V₂(PO₄)₂F₃ Positive Electrode Durable against Temperature Variation