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首页> 外文期刊>Nanotechnology >Ultrafine antimony (Sb) nanoparticles encapsulated into a carbon microfiber framework as an excellent LIB anode with a superlong life of more than 5000 cycles
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Ultrafine antimony (Sb) nanoparticles encapsulated into a carbon microfiber framework as an excellent LIB anode with a superlong life of more than 5000 cycles

机译：超细锑（Sb）纳米颗粒包封成碳微纤维框架，作为优质的Lib阳极，具有超过5000个循环的超阵寿命

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摘要

Antimony (Sb) anode has attracted increasing attention given its high theoretical capacity and suitable working potential. Nonetheless, its practical application is largely hindered by huge volume changes during the cyclic process, resulting in unsatisfactory long-term cycled stabilities at high current density. In this work, large-scale ultrafine Sb nanoparticles are functionally designed to encapsulate into a 3D carbon microfiber framework (CMF) via a scalable electrospinning approach followed by a thermal treatment process. This fabrication strategy effectively avoids the change in the volume of the Sb anode and provides a fast conductive network to serve as an efficient 3D e/Li+ transport pathway. Benefiting from this novel structural design, an ultrafine Sb nanoparticles@carbon microfiber framework (U-Sb-NPs@CMF) composite anode used for lithium-ion batteries (LIBs) delivers a high reversible capacity of 622 mAh g(-1) after 200 cycles at 0.5 A g(-1) and 507 mAh g(-1) after 2000 cycles at 2 Ag-1 and a high-capacity retention of 350 mAh g(-1) even after 5000 long-term cycles. These outstanding charge-discharge performances suggest that the U-Sb-NPs@CMF composite is a promising candidate for an anode material in the application of LIBs.
机译：锑（Sb）阳极吸引了越来越多的关注给予了很高的理论能力和合适的工作潜力。然而，它的实际应用在很大程度上是在循环过程受阻由巨大的体积变化，从而导致在高电流密度不令人满意的长期循环稳定性。在这项工作中，大规模的超细锑纳米颗粒功能上设计成封装成经由可伸缩的电纺丝的方法，接着的热处理工序的3D碳微纤维框架（CMF）。该制造策略有效地避免了在SB阳极的体积变化，并提供快速的导电网络以用作高效的3D E / Li +的输送通路。从这种新颖结构设计受益，超细的Sb纳米颗粒@碳微纤维框架（U-SB-的NP @ CMF）用于锂离子电池（LIBS）复合阳极提供的622毫安克（-1）200后的高可逆容量个循环的0.5 A克（-1），并在2的Ag-1 2000次循环和350毫安克（-1）的高容量保持后507毫安克（-1）即使经过5000长期周期。这些优秀的充电 - 放电性能表明，在U-SB-的NP @ CMF复合是用于LIBS的应用的阳极材料有希望的候选。

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