Li2CO3-affiliative mechanism for air-accessible interface engineering of garnet electrolyte via facile liquid metal painting

Garnet based solid-state batteries have the advantages of wide electrochemical window and good chemical stability. However, at Li-garnet interface, the poor interfacial wettability due to Li 2 CO 3 passivation usually causes large resistance and unstable contact. Here, a Li 2 CO 3 -affiliative mecha...

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Veröffentlicht in:Nature communications 2020-07, Vol.11 (1), p.3716-3716, Article 3716
Hauptverfasser: Meng, Junwei, Zhang, Yang, Zhou, Xuejun, Lei, Meng, Li, Chilin
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Sprache:eng
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Zusammenfassung:Garnet based solid-state batteries have the advantages of wide electrochemical window and good chemical stability. However, at Li-garnet interface, the poor interfacial wettability due to Li 2 CO 3 passivation usually causes large resistance and unstable contact. Here, a Li 2 CO 3 -affiliative mechanism is proposed for air-accessible interface engineering of garnet electrolyte via facile liquid metal (LM) painting. The natural LM oxide skin enables a superior wettability of LM interlayer towards ceramic electrolyte and Li anode. Therein the removal of Li 2 CO 3 passivation network is not necessary, in view of its delamination and fragmentation by LM penetration. This dissipation effect allows the lithiated LM nanodomains to serve as alternative Li-ion flux carriers at Li-garnet interface. This mechanism leads to an interfacial resistance as small as 5 Ω cm 2 even after exposing garnet in air for several days. The ultrastable Li plating and stripping across LM painted garnet can last for 9930 h with a small overpotential. At Li-garnet interface, the poor interfacial wettability due to Li 2 CO 3 passivation causes large resistance and unstable contact. Here the authors propose a Li 2 CO 3 -affiliative mechanism for air-accessible interface engineering of garnet electrolyte with superior wettability via facile liquid metal painting.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-17493-x