期刊
ELECTROCHEMISTRY
卷 86, 期 1, 页码 1-5出版社
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.17-00055
关键词
Lithium-sulfur Batteries; All-solid-state Batteries; Composite Electrodes; Thio-LISICON
资金
- Advanced Low Carbon Technology Research and Development Program, Specially Promoted Research for Innovative Next Generation Batteries (ALCA-SPRING) of the Japan Science and Technology Agency (JST)
Composite sulfur electrodes are prepared by prolonged mechanical milling (>= 300 min) for use in all-solid-state lithium-sulfur batteries, and their structure and electrochemical properties are investigated. These batteries exhibit a high initial discharge capacity (> 1500 mAh g(-1)). Sulfur, acetylene black, and the solid electrolyte Li3.25Ge0.25P0.75S4 are mixed by planetary ball milling to form composites that contain amorphous phases of the starting materials, as well as a byproduct with a novel structural unit arising from the reaction between sulfur and the solid electrolyte. Batteries with a composite electrode/Li3.25Ge0.25P0.75S4/Li-In anode configuration exhibit a high initial discharge capacity (> 1100 mAh g(-1)). However, the capacity fades during cycling (similar to 500 mAh g(-1) at the 30th cycle), possibly because of the increased resistance of the composite. Structural and compositional changes of the byproduct and the solid electrolyte itself during the battery reaction could contribute to the increase in resistance that cause the deterioration of cyclability. (C) The Electrochemical Society of Japan, All rights reserved.
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