Encapsulating SnxSb Nanoparticles in Multichannel Graphene-Carbon Fibers As Flexible Anodes to Store Lithium Ions with High Capacities
Encapsulating SnxSb Nanoparticles in Multichannel Graphene-Carbon Fibers As Flexible Anodes to Store Lithium Ions with High Capacities
复制标题
将 SnxSb 纳米颗粒封装在多通道石墨烯碳纤维中作为柔性阳极以高容量存储锂离子
DOI：
10.1021/acsami.5b06377
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发表时间：
2015
影响因子：
9.5
通讯作者：
Zhang Tianfang
中科院分区：
文献类型：
--
作者：
Tang Xuan;Yan Feilong;Wei Yuehua;Zhang Ming;Wang Taihong;Zhang Tianfang
SnxSb金属间复合材料作为锂离子电池（LIB）的高理论容量阳极，由于体积变化巨大，容量迅速衰减。在这项研究中，由SnxSb-石墨烯-碳多孔多通道纳米纤维制成的柔性垫通过静电纺丝方法和随后在700 °C下的退火处理来制造。作为无粘合剂阳极的柔性垫在0.1 A/g的电流密度下在第500次循环中显示出729 mA h/g的比容量，这远高于石墨烯-碳纳米纤维、纯碳纳米纤维和SnxSb-石墨烯-碳纳米纤维在相同循环下的比容量。柔性垫可以在2A/g下提供381 mA h/g的可逆容量，也高于纳米纤维、石墨烯-碳纳米纤维和SnxSb-碳纳米纤维的可逆容量。研究发现，合适的纳米通道可以容纳体积膨胀，以实现高的比容量。此外，石墨烯作为导电和机械性能的添加剂，以提高速率容量和柔性的垫。静电纺丝技术结合石墨烯改性可能是制备燃料电池、锂离子电池和超级电容器柔性电极的有效方法。
SnxSb intermetallic composites as high theoretical capacities anodes for lithium ion batteries (LIBs) suffer from the quick capacity fading owing to their huge volume change. In this study, flexible mats made up of SnxSb-graphene-carbon porous multichannel nanofibers are fabricated by an electrospinning method and succedent annealing treatment at 700 °C. The flexible mats as binder-free anodes show a specific capacity of 729 mA h/g in the 500th cycle at a current density of 0.1 A/g, which is much higher than those of graphene-carbon nanofibers, pure carbon nanofibers, and SnxSb-graphene-carbon nanofibers at the same cycle. The flexible mats could provide a reversible capacity of 381 mA h/g at 2 A/g, also higher than those of nanofibers, graphene-carbon nanofibers, and SnxSb-carbon nanofibers. It is found that the suitable nanochannels could accommodate the volume expansion to achieve a high specific capacity. Besides, the graphene serves as both conductive and mechanical-property additives to enhance the rate capacity and flexibility of the mats. The electrospinning technique combined with graphene modification may be an effective method to produce flexible electrodes for fuel cells, lithium ion batteries, and super capacitors.