December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
CH04.05.02

Charge-Clustering Induced Fast Ion Conduction in 2LiX-GaF3—A Strategy for Electrolyte Design

When and Where

Dec 3, 2024
10:30am - 10:45am
Sheraton, Third Floor, Commonwealth

Presenter(s)

Co-Author(s)

Erica Truong1,Sawankumar Patel1,Valentina Lacivita2,Haoyu Liu1,Yongkang Jin1,Yan Eric Wang2,Lincoln Miara2,RyoungHee Kim3,Hyeokjo Gwon3,Rongfu Zhang1,Ivan Hung4,Zhehong Gan4,Sung-Kyun Jung5,Yan-Yan Hu1

Florida State University1,Samsung Advanced Institute of Technology-America2,Samsung Advanced Institute of Technology3,National High Magnetic Field Laboratory4,Ulsan National Institute of Science and Technology5

Abstract

Erica Truong1,Sawankumar Patel1,Valentina Lacivita2,Haoyu Liu1,Yongkang Jin1,Yan Eric Wang2,Lincoln Miara2,RyoungHee Kim3,Hyeokjo Gwon3,Rongfu Zhang1,Ivan Hung4,Zhehong Gan4,Sung-Kyun Jung5,Yan-Yan Hu1

Florida State University1,Samsung Advanced Institute of Technology-America2,Samsung Advanced Institute of Technology3,National High Magnetic Field Laboratory4,Ulsan National Institute of Science and Technology5
2LiX-GaF<sub>3</sub> (X = Cl, Br, I) electrolytes offer favorable features for solid-state batteries: mechanical pliability and high conductivities. However, understanding the origin of fast ion transport in 2LiX-GaF<sub>3</sub> has been challenging. The ionic conductivity order of 2LiCl-GaF<sub>3</sub> (3.20 mS/cm) &gt; 2LiBr-GaF<sub>3</sub> (0.84 mS/cm) &gt; 2LiI-GaF<sub>3</sub> (0.03 mS/cm) contradicts binary LiCl (10<sup>−12</sup> S/cm) &lt; LiBr (10<sup>−10</sup> S/cm) &lt; LiI (10<sup>−7</sup> S/cm). Using multinuclear <sup>7</sup>Li, <sup>71</sup>Ga, <sup>19</sup>F solid-state nuclear magnetic resonance and density functional theory simulations, we found that Ga(F,X)<sub><i>n</i></sub> polyanions boost Li<sup>+</sup>-ion transport by weakening Li<sup>+</sup>-X<sup>−</sup> interactions via charge clustering. In 2LiBr-GaF<sub>3</sub> and 2LiI-GaF<sub>3</sub>, Ga-X coordination is reduced with decreased F participation, compared to 2LiCl-GaF<sub>3</sub>. These insights will inform electrolyte design based on charge clustering, applicable to various ion conductors. This strategy could prove effective for producing highly conductive multivalent cation conductors such as Ca<sup>2+</sup> and Mg<sup>2+</sup>, as charge clustering of carboxylates in proteins is found to decrease their binding to Ca<sup>2+</sup> and Mg<sup>2+</sup>.

Keywords

nuclear magnetic resonance (NMR)

Symposium Organizers

Rachel Carter, U.S. Naval Research Laboratory
David Halat, Lawrence Berkeley National Laboratory
Mengya Li, Oak Ridge National Laboratory
Duhan Zhang, Massachusetts Institute of Technology

Symposium Support

Bronze
Nextron Corporation

Session Chairs

David Halat
Mengya Li

In this Session