Ultrafine antimony (Sb) nanoparticles encapsulated into a carbon microfiber framework as an excellent LIB anode with a superlong life of more than 5000 cycles
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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超细锑（Sb）纳米颗粒封装在碳微纤维框架中，作为优异的LIB阳极，具有超过5000次循环的超长寿命
DOI：
10.1088/1361-6528/ab73b8
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发表时间：
2020-02
期刊：
影响因子：
3.5
通讯作者：
Xie Wenhe
中科院分区：
文献类型：
--
作者：
Wang Wenjie;Xu Junqi;Xu Zijun;Zheng Wenrui;Wang Yanrui;Jia Yonglei;Ma Jingyao;Wang Chunlei;Xie Wenhe
锑（Sb）阳极因其高理论容量和合适的工作潜力而受到越来越多的关注。然而，其实际应用在很大程度上受到循环过程中巨大体积变化的阻碍，导致高电流密度下的长期循环稳定性不令人满意。在这项工作中，大规模超细锑纳米颗粒在功能上被设计为通过可扩展的静电纺丝方法和热处理工艺封装到 3D 碳微纤维框架 (CMF) 中。这种制造策略有效地避免了 Sb 阳极体积的变化，并提供了快速导电网络作为有效的 3D e/Li+ 传输路径。受益于这种新颖的结构设计，用于锂离子电池（LIB）的超细锑纳米颗粒@碳微纤维框架（U-Sb-NPs@CMF）复合阳极在0.5 A g−1下循环200次后可提供622 mAh g−1的高可逆容量，在2 Ag−1下循环2000次后可提供507 mAh g−1的高可逆容量，并具有350 mAh g−1的高容量保持率即使经过 5000 个长期循环后。这些出色的充放电性能表明，U-Sb-NPs@CMF 复合材料是锂离子电池应用中很有前景的负极材料。
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.
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