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N , N -Dimethylacetamide-Diluted Nitrate Electrolyte for Aqueous Zn//LiMn 2 O 4 Hybrid Ion Batteries.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2021 Oct 06; Vol. 13 (39), pp. 46634-46643. Date of Electronic Publication: 2021 Sep 27. - Publication Year :
- 2021
-
Abstract
- N , N -Dimethylacetamide (DMA) cooperated with LiNO <subscript>3</subscript> salt has previously shown to be a promising electrolyte for a Li//O <subscript>2</subscript> battery, showing good stability against both the O <subscript>2</subscript> electrode reaction and Li stripping/plating. In this work, DMA is hybridized with a concentrated nitrate electrolyte [2.5 m Zn(NO <subscript>3</subscript> ) <subscript>2</subscript> + 13 m LiNO <subscript>3</subscript> aqueous solution] for better electrochemical stability while using less dissolved salts. The widest electrochemical stability window for this DMA-diluted electrolyte is determined as 3.1 V, the negative critical stability potential of which is -1.6 V versus Ag/AgCl, indicating desirable stability against hydrogen evolution and Zn deposition. The findings can be attributed to the weakened Li <superscript>+</superscript> /Zn <superscript>2+</superscript> solvation sheath caused by low permittivity of DMA, as revealed through Raman spectra characterization and molecular dynamics simulation. A Zn//Zn symmetrical cell and Zn//LiMn <subscript>2</subscript> O <subscript>4</subscript> hybrid ion batteries are assembled in air directly, attributed to the stability of DMA toward O <subscript>2</subscript> . Zn stripping/plating with a dendrite-free morphology is delivered for 110 h and 200 charge/discharge cycles under 1 C rate, achieving 99.0% Coulombic efficiency. The maximum capacity of the battery is 121.0 mA h·g <superscript>-1</superscript> under 0.2 C rate (based on the mass of LiMn <subscript>2</subscript> O <subscript>4</subscript> ), delivering an energy density of 165.8 W h·kg <superscript>-1</superscript> together with 2.0 V working voltage. This work demonstrates the feasibility and validity of utilizing a relatively dilute electrolyte dissolved in oxygen for a highly stable aqueous rechargeable battery.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 13
- Issue :
- 39
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 34570470
- Full Text :
- https://doi.org/10.1021/acsami.1c12911