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Title: Aqueous anion insertion into a hydrocarbon cathode via a water-in-salt electrolyte

Abstract

We report coronene, a polycyclic aromatic hydrocarbon, exhibits reversible oxidative anion insertion properties in a LiTFSI based water-in-salt electrolyte. The coronene electrode delivers a reversible capacity of ~64.5 mAh g –1 with the first-cycle Coulombic efficiency of ~73.1%. The results demonstrate that the high concentrations of LiTFSI lower the anion-insertion potential in coronene, which allows to reveal the capacity below the onset of oxygen evolution reaction. Furthermore, evidence points to the formation of cathode electrolyte interphase on the surface of coronene, which contributes to the reversible anion-storage in coronene as well. Ex situ XRD and SEM are carried out to reveal the structural evolution of the coronene electrode and storage mechanism of the TFSI anions. FTIR studies reveal that upon anion insertion the interactions between the TFSI - ion and coronene molecules resemble that of covalent bonding.

Authors:
 [1];  [2];  [2];  [2]
  1. Oregon State Univ., Corvallis, OR (United States). Dept. of Chemistry; Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy & Environment Directorate
  2. Oregon State Univ., Corvallis, OR (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1575402
Report Number(s):
PNNL-SA-145540
Journal ID: ISSN 1388-2481
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Electrochemistry Communications
Additional Journal Information:
Journal Volume: 109; Journal Issue: C; Journal ID: ISSN 1388-2481
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Dual-Ion batteries; Anion intercalation; Water-in-salt; High concentration electrolytes; Hydrocarbon cathode

Citation Formats

Rodríguez-Pérez, Ismael A., Zhang, Lu, Leonard, Daniel P., and Ji, Xiulei. Aqueous anion insertion into a hydrocarbon cathode via a water-in-salt electrolyte. United States: N. p., 2019. Web. doi:10.1016/j.elecom.2019.106599.
Rodríguez-Pérez, Ismael A., Zhang, Lu, Leonard, Daniel P., & Ji, Xiulei. Aqueous anion insertion into a hydrocarbon cathode via a water-in-salt electrolyte. United States. doi:10.1016/j.elecom.2019.106599.
Rodríguez-Pérez, Ismael A., Zhang, Lu, Leonard, Daniel P., and Ji, Xiulei. Wed . "Aqueous anion insertion into a hydrocarbon cathode via a water-in-salt electrolyte". United States. doi:10.1016/j.elecom.2019.106599. https://www.osti.gov/servlets/purl/1575402.
@article{osti_1575402,
title = {Aqueous anion insertion into a hydrocarbon cathode via a water-in-salt electrolyte},
author = {Rodríguez-Pérez, Ismael A. and Zhang, Lu and Leonard, Daniel P. and Ji, Xiulei},
abstractNote = {We report coronene, a polycyclic aromatic hydrocarbon, exhibits reversible oxidative anion insertion properties in a LiTFSI based water-in-salt electrolyte. The coronene electrode delivers a reversible capacity of ~64.5 mAh g–1 with the first-cycle Coulombic efficiency of ~73.1%. The results demonstrate that the high concentrations of LiTFSI lower the anion-insertion potential in coronene, which allows to reveal the capacity below the onset of oxygen evolution reaction. Furthermore, evidence points to the formation of cathode electrolyte interphase on the surface of coronene, which contributes to the reversible anion-storage in coronene as well. Ex situ XRD and SEM are carried out to reveal the structural evolution of the coronene electrode and storage mechanism of the TFSI– anions. FTIR studies reveal that upon anion insertion the interactions between the TFSI- ion and coronene molecules resemble that of covalent bonding.},
doi = {10.1016/j.elecom.2019.106599},
journal = {Electrochemistry Communications},
number = C,
volume = 109,
place = {United States},
year = {2019},
month = {11}
}

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