Dual mechanism of electrostatic shielding and iodide redox for self-healing lithium metal anodes

Qiu, Chao; Hong, Yeon Ki; Shi, Kaixiang; Wang, Zhengyi; Chen, Zikang; Wang, Qing; Li, Keke; Liu, Quanbing

doi:10.1016/j.ces.2023.119088

Cited by 8 publications

(2 citation statements)

References 53 publications

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“…The increased F signal confirms our speculation. In the C 1s spectrum (Figure S8a,b), the two SEI films exhibit four intermediate binding states at 284.8, 286.6, 288.8, and 290.2 eV, corresponding to binding energies of C–C, C–H, COOR, and CO 3 2– , respectively. − Peaks corresponding to Li 2 O, C–O, CO 3 2– , and COOR were observed at binding energies of 530.9, 531.9, 533.3, and 533.9 eV, respectively, in the O 1s indication spectra in Figure S9a,b. , As shown in Figure S10, the peak of the S 2p spectrum is attributed to SO x 2– . − However, the peak at the binding energy of the Li 1s spectrum at 56.2 in the SEI layer, which contains the C 4 H 2 Cl 2 S additive, corresponds to LiCl/LiF (Figure a–d). This indicates that the SEI layer that is formed is rich in LiCl and LiF.…”

Section: Resultsmentioning

confidence: 99%

In Situ Construction of a LiF/LiCl-Rich Solid Electrolyte Interphase for Lithium Ion Unimpeded Transport

Lu,

Fu,

Shi

et al. 2024

Ind. Eng. Chem. Res.

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Lithium metal batteries have attracted significant research attention because of their satisfactory specific capacity and low overpotential. However, uneven Li deposition and uncontrolled dendrite growth limit the further development of this technique. In this study, we propose the addition of C 4 H 2 Cl 2 S to the electrolyte to induce Li deposition and inhibit Li dendrite growth. The additive reacts with the surface of the lithium metal anode to promote the decomposition of TFSI − anionic groups and participate in the film formation reaction, which is confirmed by density functional theory calculation and X-ray photoelectron spectroscopy results. This results in the formation of a dense and robust solid electrolyte interphase (SEI) rich in LiF/LiCl, which enhances interphase reactivity and promotes the flux distribution of lithium ions, significantly facilitating the unimpeded transport of Li + and effectively inhibiting the growth of Li dendrites. Furthermore, the excellent mechanical strength of LiF/LiCl, the key component of the SEI, effectively inhibits the SEI rupture caused by the increase in volume of lithium metal during plating/stripping. The assembled Li||Li battery exhibited a stable cycle of over 2200 h (current density: 1 mA cm −2 , deposition capacity: 1 mAh cm −2 ). In addition, the Li−S battery also showed excellent magnification performance and excellent cycle stability; after 500 cycles at 1C, the capacity remained at 659 mAh g −1 . This study provides a simple and convenient method for constructing an SEI with strong mechanical toughness and high flux to improve the cycle stability of lithium metal batteries.

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Section: Resultsmentioning

confidence: 99%

In Situ Construction of a LiF/LiCl-Rich Solid Electrolyte Interphase for Lithium Ion Unimpeded Transport

Lu,

Fu,

Shi

et al. 2024

Ind. Eng. Chem. Res.

Self Cite

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“…Since then, the method of regenerating Li with iodine additives has gradually been favored by researchers. [71][72][73] Zhang et al [66] used a new-type redox shuttle additive: cridine-1-oxyl [16] Copyright 2021, Journal of Energy Chemistry.…”

Section: The Solution To the Dead LI Problemmentioning

confidence: 99%

Dead Lithium in Lithium Metal Batteries: Formation, Characterization and Strategies

Jiang,

2024

Chemistry A European J

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Lithium (Li) metal anode (LMA) replacing graphite anode for developing Li metal batteries (LMB) with the higher energy density has attracted much attention. However, LMA faces many issues, e.g., Li dendrites, dead Li and the side reactions, which causes the safety hazards and low coulomb efficiency (CE) of battery, therefore, LMB still cannot replace the current Li ion battery for practical use. Among those issues, dead Li is one of the decisive factors affecting the CE of LMB. To better understand dead Li, we summarize the recent work about the generation of dead Li, its impact on batteries performance, and the strategies to reuse and eliminate dead Li. Finally, the prospect of the future LMA and resultant LMB is also put forward.

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Commonalities and Characteristics Analysis of Fluorine and Iodine used in Lithium‐Based Batteries

Gao,

Liu,

et al. 2024

Adv Funct Materials

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Among optimization strategies for solving the poor ion transport ability and electrolyte/electrode interface compatibility problems of lithium (Li)‐based batteries, halogen elements, such as fluorine (F) and iodine (I), have gradually occupied an important position because of their superb electronegativity, oxidizability, ionic radius, and other properties. The study commences by outlining the shared mechanism by which F and I enhance solid‐state lithium metal batteries' electrochemical performance. In particular, F and I can considerably improve ion transport capacity through chemical means such as intermolecular interactions and halogenation reactions. Furthermore, the utilization of F and I significantly enhances the stability of the electrolyte/electrode interface via physical strategies, encompassing doping techniques, the application of surface coatings, and the fabrication of synthetic intermediate layers. Subsequently, the characteristics of F and I used in Li‐based batteries are elaborated in detail, focusing on the fact that F can provide additional energy density as an anode material but by different mechanisms. Additionally, I can considerably activate dead lithium at the negative electrode, and F can act as a new carrier. Finally, a rational concept of the synergistic effect of F and I is proposed and the feasibility of F–I bihalide solid electrolytes is explored.

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Dual mechanism of electrostatic shielding and iodide redox for self-healing lithium metal anodes

Cited by 8 publications

References 53 publications

In Situ Construction of a LiF/LiCl-Rich Solid Electrolyte Interphase for Lithium Ion Unimpeded Transport

In Situ Construction of a LiF/LiCl-Rich Solid Electrolyte Interphase for Lithium Ion Unimpeded Transport

Dead Lithium in Lithium Metal Batteries: Formation, Characterization and Strategies

Commonalities and Characteristics Analysis of Fluorine and Iodine used in Lithium‐Based Batteries

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