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Electrochemical Activation of LiGaO 2 : Implications for Ga-Doped Garnet Solid Electrolytes in Li-Metal Batteries.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Jul 31; Vol. 16 (30), pp. 39181-39194. Date of Electronic Publication: 2024 Jul 16. - Publication Year :
- 2024
-
Abstract
- Ga-doped Li <subscript>7</subscript> La <subscript>3</subscript> Zr <subscript>2</subscript> O <subscript>12</subscript> garnet solid electrolytes exhibit the highest Li-ion conductivities among the oxide-type garnet-structured solid electrolytes, but instabilities toward Li metal hamper their practical application. The instabilities have been assigned to direct chemical reactions between LiGaO <subscript>2</subscript> coexisting phases and Li metal by several groups previously. Yet, the understanding of the role of LiGaO <subscript>2</subscript> in the electrochemical cell and its electrochemical properties is still lacking. Here, we are investigating the electrochemical properties of LiGaO <subscript>2</subscript> through electrochemical tests in galvanostatic cells versus Li metal and complementary ex situ studies via confocal Raman microscopy, quantitative phase analysis based on powder X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and electron energy loss spectroscopy. The results demonstrate considerable and surprising electrochemical activity, with high reversibility. A three-stage reaction mechanism is derived, including reversible electrochemical reactions that lead to the formation of highly electronically conducting products. The results have considerable implications for the use of Ga-doped Li <subscript>7</subscript> La <subscript>3</subscript> Zr <subscript>2</subscript> O <subscript>12</subscript> electrolytes in all-solid-state Li-metal battery applications and raise the need for advanced materials engineering to realize Ga-doped Li <subscript>7</subscript> La <subscript>3</subscript> Zr <subscript>2</subscript> O <subscript>12</subscript> for practical use.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 16
- Issue :
- 30
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 39012897
- Full Text :
- https://doi.org/10.1021/acsami.4c03729