Yu H, Siebert A, Mei S, Garcia-Diez R, Félix R, Quan T, Xu Y, Frisch J, Wilks RG, Bär M, Pei C, Lu Y (2023)
Publication Type: Journal article
Publication year: 2023
DOI: 10.1002/eem2.12539
The development of freestanding and binder-free electrode is an effective approach to perform the inherent capacity of active materials and promote the mechanism study by minimizing the interference from additives. Herein, we construct a freestanding cathode composed of MoS3/PPy nanowires (NWs) deposited on porous nickel foam (NF) (MoS3/PPy/NF) through electrochemical methods, which can work efficiently as sulfur-equivalent cathode material for Li-S batteries. The structural stability of the MoS3/PPy/NF cathode is greatly enhanced due to its significant tolerance to the volume expansion of MoS3 during the lithiation process, which we ascribe to the flexible 3D-framework of PPy NWs, leading to superior cycling performance compared to the bulk-MoS3/NF reference. Eliminating the interference of binder and carbon additives, the evolution of the chemical and electronic structure of Mo and S species during the discharge/charge was studied by X-ray absorption near-edge spectroscopy (XANES). The formation of lithium polysulfides was excluded as the driving cathode reaction mechanism, suggesting the great potential of MoS3 as a promising sulfur-equivalent cathode material to evade the shuttle effect for Li-S batteries. The present study successfully demonstrates the importance of structural design of freestanding electrode enhancing the cycling performances and revealing the corresponding mechanisms.
APA:
Yu, H., Siebert, A., Mei, S., Garcia-Diez, R., Félix, R., Quan, T.,... Lu, Y. (2023). Electrochemical Realization of 3D Interconnected MoS3/PPy Nanowire Frameworks as Sulfur-Equivalent Cathode Materials for Li-S Batteries. Energy & Environmental Materials. https://doi.org/10.1002/eem2.12539
MLA:
Yu, Hongtao, et al. "Electrochemical Realization of 3D Interconnected MoS3/PPy Nanowire Frameworks as Sulfur-Equivalent Cathode Materials for Li-S Batteries." Energy & Environmental Materials (2023).
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