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Determining and Minimizing Resistance for Ion Transport at the Polymer/Ceramic Electrolyte Interface...

Publication Type
Journal
Journal Name
ACS Energy Letters
Publication Date
Page Numbers
1080 to 1085
Volume
TBD
Issue
TBD

In this work, we report methods to quantify and minimize the interfacial resistance for Li ion transport, Rinterface, between a model polymer electrolyte, poly(ethylene oxide) + LiCF3SO3 (PE), and a model Li+-conducting ceramic electrolyte, LICGC from Ohara Corporation. By constructing a PE–ceramic–PE trilayer cell, we found Rinterface to be very large, 1.2 kΩ·cm2 at 30 °C, accounting for 66% of the total trilayer cell resistance. When dimethyl carbonate, a loose-binding solvent of Li+, was introduced into the trilayer, Rinterface decreased to essentially zero. As a result, a composite electrolyte with carbonate plasticizers wherein 40 vol % ceramic particles were dispersed in the polymer showed extraordinary room-temperature conductivity of approximately 10–4 S/cm, 3 orders of magnitude higher than that of the dry composite electrolyte. This discovery can be used as guidance in designing composite electrolytes to achieve synergistic effects.