High Capacity Li2S–Li2O–LiI Positive Electrodes with Nanoscale Ion‐Conduction Pathways for All‐Solid‐State Li/S Batteries

Author:

Fujita Yushi1,Sakuda Atsushi1,Hasegawa Yuki1,Deguchi Minako1,Motohashi Kota1,Jiong Ding2,Tsukasaki Hirofumi2,Mori Shigeo2,Tatsumisago Masahiro1,Hayashi Akitoshi1ORCID

Affiliation:

1. Department of Applied Chemistry Graduate School of Engineering Osaka Metropolitan University 1‐1 Gakuen‐cho, Naka‐ku Sakai Osaka 599‐8531 Japan

2. Department of Materials Science Graduate School of Engineering Osaka Metropolitan University 1‐1 Gakuen‐cho, Naka‐ku Sakai Osaka 599‐8531 Japan

Abstract

AbstractAll‐solid‐state lithium–sulfur (Li/S) batteries are promising next‐generation energy‐storage devices owing to their high capacities and long cycle lives. The Li2S active material used in the positive electrode has a high theoretical capacity; consequently, nanocomposites composed of Li2S, solid electrolytes, and conductive carbon can be used to fabricate high‐energy‐density batteries. Moreover, the active material should be constructed with both micro‐ and nanoscale ion‐conduction pathways to ensure high power. Herein, a Li2S–Li2O–LiI positive electrode is developed in which the active material is dispersed in an amorphous matrix. Li2S–Li2O–LiI exhibits high charge–discharge capacities and a high specific capacity of 998 mAh g−1 at a 2 C rate and 25 °C. X‐ray photoelectron spectroscopy, X‐ray diffractometry, and transmission electron microscopy observation suggest that Li2O–LiI provides nanoscale ion‐conduction pathways during cycling that activate Li2S and deliver large capacities; it also exhibits an appropriate onset oxidation voltage for high capacity. Furthermore, a cell with a high areal capacity of 10.6 mAh cm–2 is demonstrated to successfully operate at 25 °C using a Li2S–Li2O–LiI positive electrode. This study represents a major step toward the commercialization of all‐solid‐state Li/S batteries.

Funder

Japan Society for the Promotion of Science

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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