Issue 5, 2022

Synthesis of an AlI3-doped Li2S positive electrode with superior performance in all-solid-state batteries

Abstract

A (100 − x)Li2xAlI3 (0 ≤ x ≤ 30) positive electrode was prepared by the planetary ball-milling method for application in all-solid-state Li–S batteries. X-Ray diffraction results showed that I in AlI3 dissolved into the Li2S structure in (100 − x)Li2xAlI3 with x ≤ 5 to form the solid solution. The change of the electronic structure of Li2S and AlI3 was further proved by UV-Vis spectroscopy and X-ray photoelectron spectroscopy results. The highest conductivity of about 6.0 × 10−5 S cm−1 at room temperature was obtained with 80Li2S·20AlI3 (mol%) and the highest conductivity at 150 °C of about 7.0 × 10−3 S cm−1 was observed in 75Li2S·25AlI3. The maximum capacities of the cells with x = 0, 0.5, 1.5, and 2 were 880, 1059, 1006, and 869 mA h g−1 Li2S, respectively. The capacity retention of the cells with x = 0, 0.5, 1.5, and 2 after 60 cycles was 64.0%, 88.4%, 69.6%, and 71.2%, respectively. This study showed that AlI3 doping could improve not only the conductivities of Li2S but also the cyclic properties of all-solid-state Li–S batteries.

Graphical abstract: Synthesis of an AlI3-doped Li2S positive electrode with superior performance in all-solid-state batteries

Supplementary files

Article information

Article type
Paper
Submitted
23 déc. 2021
Accepted
26 janv. 2022
First published
09 févr. 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2022,3, 2488-2494

Synthesis of an AlI3-doped Li2S positive electrode with superior performance in all-solid-state batteries

H. Gamo, T. Maeda, K. Hikima, M. Deguchi, Y. Fujita, Y. Kawasaki, A. Sakuda, H. Muto, N. H. H. Phuc, A. Hayashi, M. Tatsumisago and A. Matsuda, Mater. Adv., 2022, 3, 2488 DOI: 10.1039/D1MA01228B

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