Dec 3, 2024
10:30am - 10:45am
Sheraton, Third Floor, Commonwealth
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
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) > 2LiBr-GaF<sub>3</sub> (0.84 mS/cm) > 2LiI-GaF<sub>3</sub> (0.03 mS/cm) contradicts binary LiCl (10<sup>−12</sup> S/cm) < LiBr (10<sup>−10</sup> S/cm) < 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>.