期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 12, 页码 11999-12007出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19237
关键词
solid state electrolytes; electric double layer; stern layer; electrochemical impedance spectroscopy; simulation of interface
资金
- Institutional Strategy of the University of Bremen Ambitious and Agile
- German Excellence Initiative (DFG) [ZUK66/1]
Composites consisting of garnet-type Li7La3Zr2O12 (LLZO) ceramic particles dispersed in a solid polymer electrolyte based on poly(ethylene oxide) (PEO) have recently been investigated as a possible electrolyte material in all solid state Li ion batteries. The interface between the two materials, that is, LLZO/PEO, is of special interest for the transport of lithium ions in the composite. For obtaining the desired high ionic conductivity, Li+ ions have to pass easily across this interface. However, previous research found that the interface is highly resistive. Here, we further investigate the interface between Al-substituted LLZO and PEO-LiClO4 electrolytes in the frame of a theoretical description, which is based on space-charge layers. By theoretical calculations supported by experiments, we find that the interface is highly resistive. From the results, we have deduced that the highest contribution to this resistance comes from a high activation energy and not from electrostatic repulsion of lithium.
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