About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond IV
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Presentation Title |
Entropy Boosting Ionic Conductivity in Crystalline Solids |
Author(s) |
Yan Chen, Hui Wang |
On-Site Speaker (Planned) |
Yan Chen |
Abstract Scope |
The concept of high-entropy material has been extended from structural alloys to functional and energy materials with outstanding properties. Here we explore a high-entropy rock-salt phase in the (1-x)Li2OHCl·xLiAlCl4 series compounds for superionic conductors. Neutron diffraction indicates that the phase LAHCO (x=1/3) has a rock-salt structure where both cations and anions are fully disordered, respectively. The configurational entropy stabilizes the structure with severe local distortions; they enable the fast Li+ transport from a poor conductor LiCl. Furthermore, by introducing the mixing entropy in the LAHCO−LiAlCl4 system, the conduction is boosted at the phases’ interface. It is attributed to the local Li vacancies in LAHCO by additional Al and Cl doping from the contacting LiAlCl4. The enhancement of Li+ transport is found to correlate to the entropy elevation. This research presents a novel high-entropy Li+ conductor, contributing to the design and exploration of new solid electrolytes for solid-state batteries. |