1. Strongly correlated perovskite lithium ion shuttles
- Author
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Zhen Zhang, Ronghui Kou, Bilge Yildiz, Cheng-Jun Sun, Yongqi Dong, Michele Kotiuga, Adrian Hunt, Hidekazu Tanaka, Sampath Gamage, Shriram Ramanathan, Badri Narayanan, Vilas G. Pol, Yohannes Abate, Daw Gen Lim, Qiyang Lu, Mathew J. Cherukara, Iradwikanari Waluyo, Yifei Sun, Subramanian K. R. S. Sankaranarayanan, Azusa N. Hattori, Hua Zhou, and Karin M. Rabe
- Subjects
Ions ,Multidisciplinary ,Dopant ,Surface Properties ,Doping ,Ionic Liquids ,02 engineering and technology ,Activation energy ,Micro-Electrical-Mechanical Systems ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Mott transition ,Ion ,Coordination Complexes ,Metals ,Chemical physics ,Interstitial defect ,Physical Sciences ,Ionic conductivity ,0210 nano-technology - 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 SmNiO 3 (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.
- Published
- 2018
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