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Polythiocyanogen as Cathode Materials for High Temperature All-Solid-State Lithium–Sulfur Batteries AITranslate

Shen Wang; Jianbin Zhou; Shijie Feng; Maansi Patel; Bingyu Lu; Weikang Li; Charles Soulen; Jiaqi Feng; Ying Shirley Meng; Ping Liu;
University of California San Diego; University of California San Diego; University of California San Diego; University of California San Diego; University of California San Diego; University of California San Diego; University of California San Diego; University of California San Diego; University of Chicago; University of California San Diego
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Abstract AITranslate

Solid-state lithium batteries are uniquely suited for operation at elevated to even high temperatures (>100 °C). Under these conditions, however, oxide cathode materials are unstable with high-conductivity sulfide-based electrolytes while elemental sulfur suffers from poor utilization due to its insulating nature. Here, we developed an ionic liquid mediated synthesis procedure for polythiocynogen (poly-SCN) and applied it as a sulfur-rich cathode. The material, with uniform, submicrometer particle size and a > 55 wt % sulfur loading, exhibits good thermal stability of over 200 °C. A specific capacity of over 800 mAh g–1 at 100 °C is realized when poly-SCN is used as a cathode in an all-solid-state battery (ASSB). Mechanistic studies show that during discharge, both C–S and S–S bonds in poly-SCN are cleaved along with the formation of Li2S. During charge, the re-formation of poly-SCN structure is observed. The scalable synthesis procedure, high thermal stability, high sulfur loading, and high capacity make poly-SCN a promising candidate for high temperature solid state batteries.

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DOI：https://doi.org/10.1021/acsenergylett.3c00659

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Citation Information:

Solid-state lithium batteries are uniquely suited for operation at elevated to even high temperatures (>100 °C). Under these conditions, however, oxide cathode materials are unstable with high-conductivity sulfide-based electrolytes while elemental sulfur suffers from poor utilization due to its insulating nature. Here, we developed an ionic liquid mediated synthesis procedure for polythiocynogen (poly-SCN) and applied it as a sulfur-rich cathode. The material, with uniform, submicrometer particle size and a > 55 wt % sulfur loading, exhibits good thermal stability of over 200 °C. A specific capacity of over 800 mAh g–1 at 100 °C is realized when poly-SCN is used as a cathode in an all-solid-state battery (ASSB). Mechanistic studies show that during discharge, both C–S and S–S bonds in poly-SCN are cleaved along with the formation of Li2S. During charge, the re-formation of poly-SCN structure is observed. The scalable synthesis procedure, high thermal stability, high sulfur loading, and high capacity make poly-SCN a promising candidate for high temperature solid state batteries.

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GB/T 7714-2015 [1] Shen Wang, Jianbin Zhou, Shijie Feng, et al. ACS Energy Letters, 2023(8). DOI:10.1021/acsenergylett.3c00659.
MLA [1] Shen Wang, et al., ACS Energy Letters, no. 8, 2023, https://doi.org/10.1021/acsenergylett.3c00659.
APA [1] Shen Wang, Jianbin Zhou, Shijie Feng, Maansi Patel, Bingyu Lu, Weikang Li, Charles Soulen, Jiaqi Feng, Ying Shirley Meng, & Ping Liu. (2023). ACS Energy Letters(8). https://doi.org/10.1021/acsenergylett.3c00659
IEEE [1] Shen Wang, Jianbin Zhou, Shijie Feng, Maansi Patel, Bingyu Lu, Weikang Li, Charles Soulen, Jiaqi Feng, Ying Shirley Meng, and Ping Liu, ACS Energy Letters, no. 8, 2023, doi: 10.1021/acsenergylett.3c00659.