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Impedance Spectroscopy Analysis of the Lithium Ion Transport through the Li7La3Zr2O12/P(EO)20Li Interface

: Langer, F.; Palagonia, M.S.; Bardenhagen, I.; Glenneberg, J.; La Mantia, F.; Kun, R.


Journal of the Electrochemical Society 164 (2017), No.12, pp.A2298-A2303
ISSN: 0013-4651
ISSN: 1945-7111
ISSN: 0096-4786
Journal Article
Fraunhofer IFAM ()
all solid state Li-ion battery; garnet type Li7La3Zr2O12; impedance specroscopy; lithium ion conductor; polymer electrolyte; solid state electrolyte

Model systems for electrochemical impedance spectroscopy (EIS) studies of solid-state electrolytes based on ceramic lithium ion conductor Li7La3Zr2O12 (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.