Li<sub>2</sub>CO<sub>3</sub>-affiliative mechanism for air-accessible interface engineering of garnet electrolyte via facile liquid metal painting.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32709915.
- Also identified by DOI 10.1038/s41467-020-17493-x and PMC identifier 7382479.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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<sub>2</sub>CO<sub>3</sub> passivation usually causes large resistance and unstable contact. Here, a Li<sub>2</sub>CO<sub>3</sub>-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<sub>2</sub>CO<sub>3</sub> 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<sup>2</sup> 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.