Electro-chemo-mechanical evolution of sulfide solid electrolyte/Li metal interfaces: operando analysis and ALD interlayer effects. Issue 13 (20th March 2020)

• Record Type: Journal Article
• Authors: Davis, Andrew L.; Garcia-Mendez, Regina; Wood, Kevin N.; Kazyak, Eric; Chen, Kuan-Hung; Teeter, Glenn; Sakamoto, Jeff; Dasgupta, Neil P.
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 13(2020)
• Page Start: 6291
• Page End: 6302
• Publication Date: 2020-03-20
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta11508k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Investigation of interfacial degradation of Li10 GeP2 S12 (LGPS) electrolytes and the effect of ALD artificial SEI interlayers in lithium metal solid state batteries using a suite of operando microscopy and spectroscopy techniques. Abstract : Sulfide solid electrolyte (SE) materials show promise for high-performance solid-state batteries because of their high ionic conductivity and ease of processing. However, several sulfide electrolytes have suffered from chemical and electrochemical instability against Li metal anodes. Herein, we use a suite of operando microscopy and spectroscopy techniques to study the impact of artificial solid electrolyte interphases (SEI) on the electro-chemo-mechanical degradation of Li10 GeP2 S12 (LGPS) solid electrolytes. Al2 O3 interlayers deposited using atomic layer deposition (ALD) are used as a model system to show that the application of artificial SEI interlayers can delay degradation at the Li/LGPS interface by modifying the solid electrolyte interphase chemistry and morphology. Optical and scanning electron microscopy are used to rationalize the electrochemical response of the system, which is attributed to a delayed onset of mechanical degradation at the interface when ALD interlayers are used. Operando X-ray photoelectron spectroscopy demonstrates that the dynamic evolution of SEI chemistry is impacted by the presence of the ALD interlayer. Auger electron spectroscopy and operando optical microscopy provide visual evidence of spatial heterogeneity of Li plating, which is attributed to the chemo-mechanical degradation of the ALD interphase. The implications of these observations provide valuable insights toward the development of robust interlayers for solid-state batteries.