Fast single metal cation conduction in ion-water aggregated aqueous battery electrolytes

Chen Xu, Huijian Wang, Chengjun Lei, Jinye Li, Wenjiao Ma and Xiao Liang ()
Additional contact information
Chen Xu: Hunan University
Huijian Wang: Hunan University
Chengjun Lei: Hunan University
Jinye Li: Hunan University
Wenjiao Ma: Hunan University
Xiao Liang: Hunan University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Metal ion transport in solution is closely linked to its interactions with counter anions and solvent molecules. This interplay creates a longstanding trade-off between transference number (tMn⁺), ionic conductivity (δ), and solvation process. Advanced aqueous batteries with metal negative electrode require electrolytes with unity tMn⁺, high δ and low solvation energy. Here we introduce guanidinium sulfate (Gdm2SO4) into metal sulfate aqueous solutions to construct the ion-water aggregated electrolytes. These electrolytes exhibit fast single ion conduction, approaching unity tMn⁺ and high δ over 50 mS cm−1 for various metal cations (M= Zn, Cu, Fe, Sn and Li). The ion-water aggregates, dynamically formed by strong hydrogen bonding between sulfate anions, guanidinium cations and water, featuring an unfrustrated topological structure to suppress both anion mobility and water activity. This general configuration decouples the metal charge carrier from its coordination sheath, resulting in decreased solvation energy. These merits lead to homogeneous metal plating/stripping behavior with high coulombic efficiency of 99.9%. Moreover, the ion-water aggregates with reinforced kosmotropic characteristics significantly decrease the freezing point of the sulfate-based electrolytes to –28 oC, making them widely applicable in aqueous metal batteries for both intercalation and conversion positive electrodes.

Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-025-59958-x Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59958-x

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-025-59958-x

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().