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Reversible Hydration Enabling High-Rate Aqueous Li-Ion Batteries

Zhang, Leiting ; Kühling, Franziska ; Mattsson, Agnes Matilda ; Knijff, Lisanne ; Hou, Xu ; Ek, Gustav ; Dufils, Thomas ; Holm Gjørup, Frederik LU orcid ; Kantor, Innokenty LU and Zhang, Chao , et al. (2024) In ACS Energy Letters 9(3). p.959-966
Abstract

Layered TiS2 has been proposed as a versatile host material for various battery chemistries. Nevertheless, its compatibility with aqueous electrolytes has not been thoroughly understood. Herein, we report on a reversible hydration process to account for the electrochemical activity and structural evolution of TiS2 in a relatively dilute electrolyte for sustainable aqueous Li-ion batteries. Solvated water molecules intercalate in TiS2 layers together with Li+ cations, forming a hydrated phase with a nominal formula unit of Li0.38(H2O)2−δTiS2 as the end-product. We unambiguously confirm the presence of two layers of intercalated water by complementary... (More)

Layered TiS2 has been proposed as a versatile host material for various battery chemistries. Nevertheless, its compatibility with aqueous electrolytes has not been thoroughly understood. Herein, we report on a reversible hydration process to account for the electrochemical activity and structural evolution of TiS2 in a relatively dilute electrolyte for sustainable aqueous Li-ion batteries. Solvated water molecules intercalate in TiS2 layers together with Li+ cations, forming a hydrated phase with a nominal formula unit of Li0.38(H2O)2−δTiS2 as the end-product. We unambiguously confirm the presence of two layers of intercalated water by complementary electrochemical cycling, operando structural characterization, and computational simulation. Such a process is fast and reversible, delivering 60 mAh g-1 discharge capacity at a current density of 1250 mA g-1. Our work provides further design principles for high-rate aqueous Li-ion batteries based on reversible water cointercalation.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Energy Letters
volume
9
issue
3
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85185611597
ISSN
2380-8195
DOI
10.1021/acsenergylett.4c00224
language
English
LU publication?
yes
id
d5c4d370-e9ba-49dc-af78-94cb63b02563
date added to LUP
2024-03-19 14:18:11
date last changed
2024-03-19 14:19:01
@article{d5c4d370-e9ba-49dc-af78-94cb63b02563,
  abstract     = {{<p>Layered TiS<sub>2</sub> has been proposed as a versatile host material for various battery chemistries. Nevertheless, its compatibility with aqueous electrolytes has not been thoroughly understood. Herein, we report on a reversible hydration process to account for the electrochemical activity and structural evolution of TiS<sub>2</sub> in a relatively dilute electrolyte for sustainable aqueous Li-ion batteries. Solvated water molecules intercalate in TiS<sub>2</sub> layers together with Li<sup>+</sup> cations, forming a hydrated phase with a nominal formula unit of Li<sub>0.38</sub>(H<sub>2</sub>O)<sub>2−δ</sub>TiS<sub>2</sub> as the end-product. We unambiguously confirm the presence of two layers of intercalated water by complementary electrochemical cycling, operando structural characterization, and computational simulation. Such a process is fast and reversible, delivering 60 mAh g<sup>-1</sup> discharge capacity at a current density of 1250 mA g<sup>-1</sup>. Our work provides further design principles for high-rate aqueous Li-ion batteries based on reversible water cointercalation.</p>}},
  author       = {{Zhang, Leiting and Kühling, Franziska and Mattsson, Agnes Matilda and Knijff, Lisanne and Hou, Xu and Ek, Gustav and Dufils, Thomas and Holm Gjørup, Frederik and Kantor, Innokenty and Zhang, Chao and Brant, William R. and Edström, Kristina and Berg, Erik J.}},
  issn         = {{2380-8195}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{959--966}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Energy Letters}},
  title        = {{Reversible Hydration Enabling High-Rate Aqueous Li-Ion Batteries}},
  url          = {{http://dx.doi.org/10.1021/acsenergylett.4c00224}},
  doi          = {{10.1021/acsenergylett.4c00224}},
  volume       = {{9}},
  year         = {{2024}},
}