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| TITLE | Unveiling the Capacity Boosting Mechanism of the MoS2 Electrode by Focusing on the Under Potential Deposition in All-Solid-State Batteries Prepared by One-Pot One-Step Liquid Phase Mixing |
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| AUTHOR | Kazuto Fujiwara, Keitaro Imai, Chie Hotehama, Hiroe Kowada, Atsushi Sakuda, Eiji Higuchi, Masanobu Chiku,* Akitoshi Hayashi, and Hiroshi Inoue |
| YEAR | 2025 |
| JOURNAL | Advanced Sustainable Systems |
| ABSTRACT | Molybdenum disulfide (MoS2) is a high theoretical capacity (670 mAh g−1) electrode material. However, several researchers report that rechargeable batteries using MoS2 often exhibit a discharge capacity of 1000 mAh g−1 that exceeds the theoretical discharge capacity. Although various speculations are proposed, only a limited number of reports have provided practical evidence. One reason is that the cleaning process of the electrolyte is essential for spectroscopically analyzing the electrodes used for the battery with liquid electrolyte. On the other hand, all-solid-state rechargeable batteries make it possible to analyze MoS2 spectroscopically without washing processes. In this study, a MoS2 electrode with high dispersion in solid-state rechargeable batteries is successfully fabricated by using one-pot one-step liquid-phase mixing methods, which realize exfoliating MoS2, synthesizing solid electrolytes, and compositing with conductive agents in a single step. Furthermore, the reason for the extra capacity is investigated to exceed the theoretical capacity by using X-ray photoelectron spectroscopy analysis without washing treatment. The underpotentially deposited lithium metal is observed onto the metallic molybdenum generated by the conversion reaction of the MoS2 electrode during discharging and is clarified to play an important role in the process of the discharge capacity exceeding the theoretical capacity of the MoS2 electrode. |
| FULL ARTICLE | https://advanced.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/adsu.202500426 |
| INSTRUMENT | NRS-3100 |
| KEYWORDS | all solid-state battery, cross-sectional SEM, liquid phase mixing, molybde numsulfide, underpotential deposition |
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