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Rational Design of Hierarchical SnO2/1T-MoS2 Nanoarray Electrode for Ultralong-Life Li–S Batteries

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posted on 14.06.2018, 00:00 by Maoxu Wang, Lishuang Fan, Da Tian, Xian Wu, Yue Qiu, Chenyang Zhao, Bin Guan, Yan Wang, Naiqing Zhang, Kening Sun
The serious shuttle effect of soluble polysulfides inevitably leads to low sulfur utilization and faster capacity decay, thus preventing the development of Li–S batteries. Array electrodes have attracted much attention owing to their binder-free and freestanding features. However, the insufficient surface area, lack of active sites with polysulfides, and poor conductive nature of the array electrode could not satisfy the need for high-rate and long-life Li–S batteries, especially for the high sulfur loading of Li–S batteries. Thus, in this work, we constructed the hierarchical C@SnO2/1T-MoS2 (C@SnO2@TMS) array electrode as the sulfur host. The hierarchical C@SnO2@TMS demonstrated strong adsorption with polysulfides, which could effectively facilitate polysulfide redox kinetics. With the C@SnO2@TMS/S as the electrode, the batteries achieved superb C-rate properties, high specific capacity, and ultralong lifespan. Even undergoing 4000 cycles at 5 C, the battery could retain a high specific capacity of 448 mAh g–1 with the capacity decay as low as 0.009% per cycle.

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