Reversible Hydration Enabling High-Rate Aqueous Li-Ion Batteries

Leiting Zhang*, Franziska Kühling, Agnes Matilda Mattsson, Lisanne Knijff, Xu Hou, Gustav Ek, Thomas Dufils, Frederik Holm Gjørup, Innokenty Kantor, Chao Zhang, William R. Brant, Kristina Edström, Erik J. Berg

*Corresponding author for this work

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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 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.

Original languageEnglish
JournalACS Energy Letters
Volume9
Pages (from-to)959-966
ISSN2380-8195
DOIs
Publication statusPublished - 2024

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