AUTHOR=Phuc Nguyen Huu Huy , Takaki Maeda , Hiroyuki Muto , Atsunori Matsuda 

TITLE=Preparation of Li2-3xAlxS for All-Solid-State Li-S Battery

JOURNAL=Frontiers in Energy Research

VOLUME=8

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2020.606023

DOI=10.3389/fenrg.2020.606023

ISSN=2296-598X

ABSTRACT=<p>Li<sub>2-3x</sub>Al<sub>x</sub>S (0 ≤ <italic>x</italic> ≤ 0.1667) was prepared via the planetary ball-milling method. Diffuse reflection UV-Vis measurements revealed that the band gap and electronic structure of Li<sub>2</sub>S changed with the formation of defective Li<sub>2-3x</sub>Al<sub>x</sub>S. Compared with <italic>x</italic> = 0, the ionic conductivity for the sample with <italic>x</italic> = 0.1334 improved by ∼3 orders of magnitude. The lithium movement activation energy and pre-exponential factor A were found to be dependent on the <italic>x</italic> value. Compared with Li<sub>2</sub>S, a ∼10-fold improvement in the electronic conductivity was realized with the addition of Al<sub>2</sub>S<sub>3</sub>. Additionally, the all-solid-state Li-S battery cell performance also displayed an enhancement in both the initial capacity and stability for sample <italic>x</italic> = 0.1667 compared with <italic>x</italic> = 0. This study highlighted the importance of the intrinsic electronic conductivity of the active materials (but not the electrode) on the performance of the all-solid-state Li-S battery.</p>