Abstract
Solid-state ion shuttles are of broad interest in electrochemical devices, nonvolatile memory, neuromorphic computing, and biomimicry utilizing synthetic membranes. Traditional design approaches are primarily based on substitutional doping of dissimilar valent cations in a solid lattice, which has inherent limits on dopant concentration and thereby ionic conductivity. Here, we demonstrate perovskite nickelates as Li-ion shuttles with simultaneous suppression of electronic transport via Mott transition. Electrochemically lithiated SmNiO3 (Li-SNO) contains a large amount of mobile Li+ located in interstitial sites of the perovskite approaching one dopant ion per unit cell. A significant lattice expansion associated with interstitial doping allows for fast Li+ conduction with reduced activation energy. We further present a generalization of this approach with results on other rare-earth perovskite nickelates as well as dopants such as Na+. The results highlight the potential of quantum materials and emergent physics in design of ion conductors.
Funder
National Science Foundation
DOD | USAF | AFMC | Air Force Office of Scientific Research
DOE | LDRD | Brookhaven National Laboratory
DOE | LDRD | Argonne National Laboratory
DOD | United States Army | RDECOM | Army Research Office
DOD | United States Navy | Office of Naval Research
MEXT | Japan Society for the Promotion of Science
U.S. Department of Energy
Publisher
Proceedings of the National Academy of Sciences
Cited by
55 articles.
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