Impedance Spectroscopy Analysis of the Lithium Ion Transport through the Li7La3Zr2O12/P(EO)20Li Interface. Issue 12 (1st January 2017)

• Record Type: Journal Article
• Authors: Langer, Frederieke; Palagonia, Maria Sofia; Bardenhagen, Ingo; Glenneberg, Jens; La Mantia, Fabio; Kun, Robert
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 12(2017)
• Page Start: A2298
• Page End: A2303
• Publication Date: 2017-01-01
• Subjects: all solid state Li-ion battery -- garnet type Li7La3Zr2O12 -- impedance specroscopy -- lithium ion conductor -- polymer electrolyte -- solid state electrolyte; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0381712jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Model systems for electrochemical impedance spectroscopy (EIS) studies of solid-state electrolytes based on ceramic lithium ion conductor Li7 La3 Zr2 O12 (LLZO) and polymer electrolyte P(EO)20 -LiClO4 are investigated for the first time. The aim of the present study is to identify and quantify the lithium ion transition resistance of the ceramic/polymer interface. Symmetrical model systems consisting of LLZO pellets with sheets of P(EO)20 -LiClO4 are manufactured and investigated in detail. In such symmetric model systems we observed an additional ion-transfer process, which we attributed to the interface processes (i.e. distributed Li + transition across the interface). Based on the EIS measurement data obtained above the polymer electrolyte's melting temperature, at 70°C the interface resistance of the lithium ion transition is estimated to be ∼9 kΩ cm² and the capacitance of the process is in the order of 0.1 μF/cm². According to our investigations, it is possible to predict interface resistivity of lithium ion transport for different polymer/ceramic composite electrolytes for solid state lithium battery applications.