Manipulating Li2S2/Li2S mixed discharge products of all-solid-state lithium sulfur batteries for improved cycle life

Jung Tae Kim, Adwitiya Rao, Heng-Yong Nie, Yang Hu, Weihan Li, Feipeng Zhao, Sixu Deng, Xiaoge Hao, Jiamin Fu, Jing Luo, Hui Duan, Changhong Wang (), Chandra Veer Singh () and Xueliang Sun ()
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Jung Tae Kim: University of Western Ontario
Adwitiya Rao: University of Toronto
Heng-Yong Nie: University of Western Ontario
Yang Hu: University of Western Ontario
Weihan Li: University of Western Ontario
Feipeng Zhao: University of Western Ontario
Sixu Deng: University of Western Ontario
Xiaoge Hao: University of Western Ontario
Jiamin Fu: University of Western Ontario
Jing Luo: University of Western Ontario
Hui Duan: University of Western Ontario
Changhong Wang: University of Western Ontario
Chandra Veer Singh: University of Toronto
Xueliang Sun: University of Western Ontario

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

Abstract: Abstract All-solid-state lithium-sulfur batteries offer a compelling opportunity for next-generation energy storage, due to their high theoretical energy density, low cost, and improved safety. However, their widespread adoption is hindered by an inadequate understanding of their discharge products. Using X-ray absorption spectroscopy and time-of-flight secondary ion mass spectrometry, we reveal that the discharge product of all-solid-state lithium-sulfur batteries is not solely composed of Li2S, but rather consists of a mixture of Li2S and Li2S2. Employing this insight, we propose an integrated strategy that: (1) manipulates the lower cutoff potential to promote a Li2S2-dominant discharge product and (2) incorporates a trace amount of solid-state catalyst (LiI) into the S composite electrode. This approach leads to all-solid-state cells with a Li-In alloy negative electrode that deliver a reversible capacity of 979.6 mAh g−1 for 1500 cycles at 2.0 A g−1 at 25 °C. Our findings provide crucial insights into the discharge products of all-solid-state lithium-sulfur batteries and may offer a feasible approach to enhance their overall performance.

Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42109-5

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DOI: 10.1038/s41467-023-42109-5

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