Tracer diffusion coefficient measurements on NASICON-type Lithium-ion conductor LAGP using neutron radiography between 25C and 500C

高木 穂乃香*; 薮塚 武史*; 林田 洋寿*; Song, F.; 甲斐 哲也; 篠原 武尚; 栗田 圭輔; 飯倉 寛; 山本 典央*; 中島 稔*; et al.

Solid State Ionics, 417, p.116716_1 - 116716_7, 2024/12

https://doi.org/10.1016/j.ssi.2024.116716

Tracer diffusion coefficients of lithium-ions in the sintered samples of LiAlGe(PO) (LAGP) have been measured through the neutron radiography (NR) technique in the wide temperature range from 25C to 500C. The diffusion data above and below 300C were collected using pulsed and reactor-generated neutrons, respectively, which coincide with each other at 300C exhibiting a single curve in the Arrhenius plot. The room-temperature diffusion coefficient and the activation energy below 300C are obtained as 1.4710 cm s and 0.37 eV, respectively. The activation energy of the conductivity diffusion coefficient almost agrees with the tracer one, and the deduced Haven ratio of 0.40 is consistent with the concerted migration model of the lithium-ions.