Ultra-thin solid electrolyte interphase evolution and wrinkling processes in molybdenum disulfide-based lithium-ion batteries

Jing Wan, Yang Hao, Yang Shi, Yue-Xian Song, Hui-Juan Yan, Jian Zheng (), Rui Wen () and Li-Jun Wan
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Jing Wan: Chinese Academy of Sciences
Yang Hao: University of Chinese Academy of Sciences
Yang Shi: Chinese Academy of Sciences
Yue-Xian Song: Chinese Academy of Sciences
Hui-Juan Yan: Chinese Academy of Sciences
Jian Zheng: University of Chinese Academy of Sciences
Rui Wen: Chinese Academy of Sciences
Li-Jun Wan: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Molybdenum disulfide is considered one of the most promising anodes for lithium-ion batteries due to its high specific capacity; however, it suffers from an unstable solid electrolyte interphase. Understanding its structural evolution and reaction mechanism upon charging/discharging is crucial for further improvements in battery performance. Herein, the interfacial processes of solid electrolyte interphase film formation and lithiation/delithiation on ultra-flat monolayer molybdenum disulfide are monitored by in situ atomic force microscopy. The live formation of ultra-thin and dense films can be induced by the use of fluoroethylene carbonate as an additive to effectively protect the anode electrodes. The evolution of the fluoroethylene carbonate-derived solid electrolyte interphase film upon cycling is quantitatively analysed. Furthermore, the formation of wrinkle-structure networks upon lithiation process is distinguished in detailed steps, and accordingly, structure-reactivity correlations are proposed. These quantitative results provide an in-depth understanding of the interfacial mechanism in molybdenum disulfide-based lithium-ion batteries.

Date: 2019
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DOI: 10.1038/s41467-019-11197-7

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