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摘要:
Wearable flexible devices require advanced lithium-ion batteries (LIBs) for energy supply, thus promotes the development of self-assembled, binder-free, film-type anodes with the advantage of no additives, strong binding force and low contact resistance. Among many potential candidates, 2H phase molybdenum disulfide (2H-MoS2) has been attracting much attention due to its high practical capacity and graphene-like structure. However, few interests are paid to the compactness design inside the in-situ grown MoS2 film on bendable matrices, leading to poor structure stability and low volumetric capacity. Herein, film compactness is carefully modulated by controlling the sputtering parameters, then the cross-section microstructure and electrochemical property are systematically investigated. Among them, the dendritic-arranged, middle porosity MoS2 (MP-MoS2) offers abundant Li-ion migration channels, delivering an enhanced charge-discharge capacity of 1136 and 1157 mAh center dot g(-1) (similar to 3.7 Ah.cm(-3)) after 300 cycles at 1C. MP-MoS2 (2 h) with the same structure and increased mass loading can also stably operate for 400 cycles without decay. Notably, it remains stable cycling on titanium and stainless-steel matrices, but the sharp decay often occurs within tens of cycles towards common copper foil due to Cu diffusion and film orientation alteration, implying that low-melting-point flexible matrices are not suitable for in-situ 2H-MoS2 assembling at high temperature. This work provides a practical analyzation strategy for designing film-type 2H-MoS2 anode material used as flexible LIBs.
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来源 :
MATERIALS CHARACTERIZATION
ISSN: 1044-5803
年份: 2022
卷: 196
4 . 7
JCR@2022
4 . 7 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
ESI高被引阀值:66
JCR分区:1
中科院分区:1
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