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Synergistically Assembled Li2S/FWNTs@Reduced Graphene Oxide Nanobundle Forest for Free‐Standing High‐Performance Li2S Cathodes
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-05-04 , DOI: 10.1002/adfm.201700987
Yan Chen 1 , Songtao Lu 1 , Jia Zhou 1 , Wei Qin 2 , Xiaohong Wu 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-05-04 , DOI: 10.1002/adfm.201700987
Yan Chen 1 , Songtao Lu 1 , Jia Zhou 1 , Wei Qin 2 , Xiaohong Wu 1
Affiliation
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Lithium sulfide (Li2S) has attracted increasing attention as a promising cathode because of its compatibility with more practical lithium‐free anode materials and its high specific capacity. However, it is still a challenge to develop Li2S cathodes with low electrochemical overpotential, high capacity and reversibility, and good rate performance. This work designs and fabricates a practical Li2S cathode composed of Li2S/few‐walled carbon nanotubes@reduced graphene oxide nanobundle forest (Li2S/FWNTs@rGO NBF). Hierarchical nanostructures are obtained by annealing the Li2SO4/FWNTs@GO NBF, which is prepared by a facile and scalable solution‐based self‐assembly method. Systematic characterizations reveal that in this unique NBF nanostructure, FWNTs act as axial shafts to direct the structure, Li2S serves as the internal active material, and GO sheets provide an external coating to minimize the direct contact of Li2S with the electrolyte. When used as a cathode, the Li2S/FWNTs@rGO NBF achieve a high capacity of 868 mAh g−1Li2S at 0.2C after 300 cycles and an outstanding rate performance of 433 mAh g−1Li2S even at 10C, suggesting that this Li2S cathode is a promising candidate for ultrafast charge/discharge applications. The design and synthetic strategies outlined here can be readily applied to the processing of other novel functional materials to obtain a much wider range of applications.
中文翻译：
协同组装的Li2S / FWNTs @还原的氧化石墨烯纳米束森林，用于独立式高性能Li2S阴极
硫化锂（Li 2 S）作为有前途的阴极越来越受到关注，因为它与更实用的无锂阳极材料兼容并且具有高比容量。然而，开发具有低电化学超电势，高容量和可逆性以及良好的倍率性能的Li 2 S阴极仍然是挑战。这项工作设计并制造了一个实用的Li 2 S阴极，该阴极由Li 2 S /少壁碳纳米管@还原的氧化石墨烯纳米束森林（Li 2 S / FWNTs @ rGO NBF）组成。通过退火Li 2 SO 4获得分层纳米结构/ FWNTs @ GO NBF，它是通过一种基于解决方案的灵活，可伸缩的自组装方法编写的。系统特性表明，在这种独特的NBF纳米结构中，FWNTs充当引导结构的轴向轴，Li 2 S用作内部活性材料，GO板提供外部涂层，以最大程度地减少Li 2 S与电解质的直接接触。当用作阴极时，Li 2 S / FWNTs @ rGO NBF在300次循环后于0.2C时可实现868 mAh g -1 Li2S的高容量，甚至在10C时也具有433 mAh g -1 Li2S的出色速率性能，这表明这个李2S阴极是超快充电/放电应用的有希望的候选者。此处概述的设计和合成策略可轻松应用于其他新型功能材料的加工，以获得更广泛的应用范围。
更新日期：2017-05-04
中文翻译：
协同组装的Li2S / FWNTs @还原的氧化石墨烯纳米束森林，用于独立式高性能Li2S阴极
硫化锂（Li 2 S）作为有前途的阴极越来越受到关注，因为它与更实用的无锂阳极材料兼容并且具有高比容量。然而，开发具有低电化学超电势，高容量和可逆性以及良好的倍率性能的Li 2 S阴极仍然是挑战。这项工作设计并制造了一个实用的Li 2 S阴极，该阴极由Li 2 S /少壁碳纳米管@还原的氧化石墨烯纳米束森林（Li 2 S / FWNTs @ rGO NBF）组成。通过退火Li 2 SO 4获得分层纳米结构/ FWNTs @ GO NBF，它是通过一种基于解决方案的灵活，可伸缩的自组装方法编写的。系统特性表明，在这种独特的NBF纳米结构中，FWNTs充当引导结构的轴向轴，Li 2 S用作内部活性材料，GO板提供外部涂层，以最大程度地减少Li 2 S与电解质的直接接触。当用作阴极时，Li 2 S / FWNTs @ rGO NBF在300次循环后于0.2C时可实现868 mAh g -1 Li2S的高容量，甚至在10C时也具有433 mAh g -1 Li2S的出色速率性能，这表明这个李2S阴极是超快充电/放电应用的有希望的候选者。此处概述的设计和合成策略可轻松应用于其他新型功能材料的加工，以获得更广泛的应用范围。
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