Superior ionic conduction in LiAlO2thin-film enabled by triply coordinated nitrogen

Min GUAN, Kai HUANG, Suwei MOU, Chunzhi JIANG, Yuncong PANG, Andrew XIANG, Jun Song CHEN, Yong XIANG, Xiaokun ZHANG*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

2 Citations (Scopus)


Developing a highly Li+-conductive thin-film electrolyte remains a challenge for the application of all-solid-state thin-film batteries. This paper reports an N-doped LiAlO2 glassy thin-film with high ionic conductivities prepared by reactive sputtering under an N2 atmosphere after the pattern of the gold standard LiPON thin-film solid electrolyte. The resulting Li+-conductive thin-film is dense without cracks and shows good adhesion to substrates. The doped N partially substitutes O and yields a triple coordination structure in the thin-films, which leads to an enhancement of ionic conductivity up to 3 orders of magnitude compared to pristine LiAlO2. On one hand, the triply coordinated nitrogen facilitates the formation of a cross-linked network and provides continuous pathways for Li+ transport. On the other hand, the triply coordinated nitrogen could provide additional hopping sites for Li+, which have a relatively weak bonding force to Li+ than O. This gives rise to an N-doped LiAlO2 thin-film with an ionic conductivity of 3.99 × 10-6 S/cm at room temperature. To the best of our knowledge, this is one of the highest ionic conductivities ever reported for LiPON-like thin-film solid electrolytes.

Original languageEnglish
Article number065310
Number of pages6
JournalAIP Advances
Issue number6
Publication statusPublished - Jun 2021
Externally publishedYes

Bibliographical note

This work was supported partly by the National Science Funds of China (Grant No. 21905040) and the startup funds from the University of Electronic Science and Technology of China (Grant No. Y03019023601008001).


Dive into the research topics of 'Superior ionic conduction in LiAlO2thin-film enabled by triply coordinated nitrogen'. Together they form a unique fingerprint.

Cite this