Realizing high-capacity all-solid-state lithium-sulfur batteries using a low-density inorganic solid-state electrolyte

Daiwei Wang, Li-Ji Jhang, Rong Kou, Meng Liao, Shiyao Zheng, Heng Jiang, Pei Shi, Guo-Xing Li, Kui Meng and Donghai Wang ()
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Daiwei Wang: The Pennsylvania State University
Li-Ji Jhang: The Pennsylvania State University
Rong Kou: The Pennsylvania State University
Meng Liao: The Pennsylvania State University
Shiyao Zheng: The Pennsylvania State University
Heng Jiang: The Pennsylvania State University
Pei Shi: The Pennsylvania State University
Guo-Xing Li: The Pennsylvania State University
Kui Meng: The Pennsylvania State University
Donghai Wang: The Pennsylvania State University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Lithium-sulfur all-solid-state batteries using inorganic solid-state electrolytes are considered promising electrochemical energy storage technologies. However, developing positive electrodes with high sulfur content, adequate sulfur utilization, and high mass loading is challenging. Here, to address these concerns, we propose using a liquid-phase-synthesized Li3PS4-2LiBH4 glass-ceramic solid electrolyte with a low density (1.491 g cm−3), small primary particle size (~500 nm) and bulk ionic conductivity of 6.0 mS cm−1 at 25 °C for fabricating lithium-sulfur all-solid-state batteries. When tested in a Swagelok cell configuration with a Li-In negative electrode and a 60 wt% S positive electrode applying an average stack pressure of ~55 MPa, the all-solid-state battery delivered a high discharge capacity of about 1144.6 mAh g−1 at 167.5 mA g−1 and 60 °C. We further demonstrate that the use of the low-density solid electrolyte increases the electrolyte volume ratio in the cathode, reduces inactive bulky sulfur, and improves the content uniformity of the sulfur-based positive electrode, thus providing sufficient ion conduction pathways for battery performance improvement.

Date: 2023
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DOI: 10.1038/s41467-023-37564-z

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