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Effective stabilization of NCM622 cathodes in aqueous/non-aqueous hybrid electrolytes by adding a phosphazene derivate as Co-solvent

Du, Leilei ; Hou, Xu LU orcid ; Zhao, Wenguang ; Haneke, Lukas ; Wang, Jun ; Ju, Xiaokang ; Liu, Xiangsi ; Yang, Yong ; Wrogemann, Jens Matthies and Künne, Sven , et al. (2022) In Journal of Power Sources 541.
Abstract

Recent progress in “water-in-salt” electrolytes (WiSEs) and “hybrid aqueous/non-aqueous electrolytes (HANEs)” made broader choices of active material in aqueous Li-ion batteries (ALIBs), because of their compared to standard aqueous electrolytes expanded electrochemical stability windows (ESWs). Exploring high energy density ALIBs is a consequently meaningful research topic. However, the formation of an ineffective interphase layer on the cathode surface in aqueous electrolyte obstructs the utilization of layered high energy cathode materials. Herein, a new organic compound, ethoxy-(pentafluoro)-cyclotriphosphazene (PFN) is introduced into HANEs as co-solvent. The addition of PFN can decrease the viscosity of highly concentrated HANEs... (More)

Recent progress in “water-in-salt” electrolytes (WiSEs) and “hybrid aqueous/non-aqueous electrolytes (HANEs)” made broader choices of active material in aqueous Li-ion batteries (ALIBs), because of their compared to standard aqueous electrolytes expanded electrochemical stability windows (ESWs). Exploring high energy density ALIBs is a consequently meaningful research topic. However, the formation of an ineffective interphase layer on the cathode surface in aqueous electrolyte obstructs the utilization of layered high energy cathode materials. Herein, a new organic compound, ethoxy-(pentafluoro)-cyclotriphosphazene (PFN) is introduced into HANEs as co-solvent. The addition of PFN can decrease the viscosity of highly concentrated HANEs and influence the solvation structure of Li+, facilitating the formation of uniform cathode electrolyte interphase (CEI). PFN forms the CEI component monoester phosphate, which betters the performance of ALIBs based on NCM622 || TiO2@LiTi2(PO4)3 (P:N = 1.5:1) that exhibit enhanced cycling stability with 79.3% capacity retention after 200 cycles at 1 C in the voltage range of 1.1–2.7 V, indicating that PFN can be a useful species to stabilize NCM622 operation in HANEs.

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publishing date
type
Contribution to journal
publication status
published
keywords
Aqueous electrolytes, Ethoxy-(pentafluoro)-cyclotriphosphazene (PFN), High concentration, High energy density aqueous lithium ion batteries, Hybrid electrolytes
in
Journal of Power Sources
volume
541
article number
231670
publisher
Elsevier
external identifiers
  • scopus:85131446347
ISSN
0378-7753
DOI
10.1016/j.jpowsour.2022.231670
language
English
LU publication?
no
additional info
Publisher Copyright: © 2022 Elsevier B.V.
id
a1437830-32b5-4576-acf0-e31221fbb164
date added to LUP
2025-12-05 22:32:59
date last changed
2025-12-11 14:41:12
@article{a1437830-32b5-4576-acf0-e31221fbb164,
  abstract     = {{<p>Recent progress in “water-in-salt” electrolytes (WiSEs) and “hybrid aqueous/non-aqueous electrolytes (HANEs)” made broader choices of active material in aqueous Li-ion batteries (ALIBs), because of their compared to standard aqueous electrolytes expanded electrochemical stability windows (ESWs). Exploring high energy density ALIBs is a consequently meaningful research topic. However, the formation of an ineffective interphase layer on the cathode surface in aqueous electrolyte obstructs the utilization of layered high energy cathode materials. Herein, a new organic compound, ethoxy-(pentafluoro)-cyclotriphosphazene (PFN) is introduced into HANEs as co-solvent. The addition of PFN can decrease the viscosity of highly concentrated HANEs and influence the solvation structure of Li<sup>+</sup>, facilitating the formation of uniform cathode electrolyte interphase (CEI). PFN forms the CEI component monoester phosphate, which betters the performance of ALIBs based on NCM622 || TiO<sub>2</sub>@LiTi<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (P:N = 1.5:1) that exhibit enhanced cycling stability with 79.3% capacity retention after 200 cycles at 1 C in the voltage range of 1.1–2.7 V, indicating that PFN can be a useful species to stabilize NCM622 operation in HANEs.</p>}},
  author       = {{Du, Leilei and Hou, Xu and Zhao, Wenguang and Haneke, Lukas and Wang, Jun and Ju, Xiaokang and Liu, Xiangsi and Yang, Yong and Wrogemann, Jens Matthies and Künne, Sven and Winter, Martin and Placke, Tobias and Li, Jie}},
  issn         = {{0378-7753}},
  keywords     = {{Aqueous electrolytes; Ethoxy-(pentafluoro)-cyclotriphosphazene (PFN); High concentration; High energy density aqueous lithium ion batteries; Hybrid electrolytes}},
  language     = {{eng}},
  month        = {{09}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Power Sources}},
  title        = {{Effective stabilization of NCM622 cathodes in aqueous/non-aqueous hybrid electrolytes by adding a phosphazene derivate as Co-solvent}},
  url          = {{http://dx.doi.org/10.1016/j.jpowsour.2022.231670}},
  doi          = {{10.1016/j.jpowsour.2022.231670}},
  volume       = {{541}},
  year         = {{2022}},
}