Influence of Al layer thickness on Li6.6Al0.05La3Zr1.75Nb0.25O12 solid electrolyte | Li anode interface in all-solid-state batteries

The critical issue of the interface between Li anode and solid electrolyte based on Li7La3Zr2O12 can be addressed by using a buffer layer. Ceramic samples were covered with Al layers of various thickness – 10, 50 and 150 nm using vacuum deposition. It was established that the deposition of 150 nm Al...

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Bibliographic Details
Published in:	Solid state ionics Vol. 370; p. 115736
Main Authors:	Il'ina, E.A., Druzhinin, K.V., Lyalin, E.D., Antonov, B.D., Pankratov, A.A., Vovkotrub, E.G., Pryakhina, V.I.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-11-2021 Elsevier BV
Subjects:	Al buffer layer Aluminum Anode \| solid electrolyte interface Anodes Batteries Buffer layers Electrolytes Electrolytic cells Heating High temperature Li anode Li7La3Zr2O12 Lithium Low temperature Low temperature physics Power sources Raman spectroscopy Solid electrolytes Solid state Solid state physics Thickness Vacuum deposition Al buffer layer Li anode Vacuum deposition Li7La3Zr2O12 Anode \| solid electrolyte interface
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Summary:	The critical issue of the interface between Li anode and solid electrolyte based on Li7La3Zr2O12 can be addressed by using a buffer layer. Ceramic samples were covered with Al layers of various thickness – 10, 50 and 150 nm using vacuum deposition. It was established that the deposition of 150 nm Al reduces interface resistance between solid electrolyte and Li and leads to a faster formation of the stable interface at room and elevated temperatures. The influence of constant current flow and heating on the tight and uniform interface formation between Li6.6Al0.05La3Zr1.75Nb0.25O12 and Li was studied. Heating leads to an increase in the contact area between Li and Al, which cannot be easily achieved at low temperatures even under applied current. According to X-ray diffraction method, Raman spectroscopy and scanning electron microscopy, no visible degradation processes occurred during the storage and operation of symmetric cells. Aluminum deposition with the layer thickness of 150 nm on the ceramic surface with preheating improves the contact with Li anode and can be used to create all-solid-state lithium power sources. •150 nm Al buffer layer improves the contact between solid electrolyte and Li anode•Constant current flow reduce the interface resistance in assembled symmetric cells•The best preforming procedure was found to be cell preheating at 200 °C•No degradation processes during storage and operation of symmetric cells occurred
ISSN:	0167-2738 1872-7689
DOI:	10.1016/j.ssi.2021.115736