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首页> 外文期刊>Nanotechnology >MOF-derived porous carbon nanofibers wrapping Sn nanoparticles as flexible anodes for lithium/sodium ion batteries
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MOF-derived porous carbon nanofibers wrapping Sn nanoparticles as flexible anodes for lithium/sodium ion batteries

机译：MOF-衍生的多孔碳纳米纤维包裹着SN纳米粒子作为锂/钠离子电池的柔性阳极

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Facile synthesis of flexible electrodes with high reversible capacity plays a key role in meeting the ever-increasing demand for flexible batteries. Herein, we incorporated Sn-based metal-organic framework (Sn-MOF) templates into crosslinked one-dimensional carbon nanofibers (CNFs) using an electrospinning strategy and obtained a hierarchical porous film (Sn@C@CNF) after a carbothermal reduction reaction. Merits of this modification strategy and its mechanism in improving the electrochemical performance of Sn nanoparticles (NPs) were revealed. Electrospun CNFs substrate ensured a highly conductive skeleton and excellent mechanical toughness, making Sn@C@CNF a self-supported binder-free electrode. Serving as a self-sacrificing template, Sn-MOF provided Sn NPs and derived into porous structures on CNFs after pyrolysis. The hierarchical porous structure of the carbon substrate was beneficial to enhancing the Li+/Na+ storage of the active materials, and the carbon wrappings derived from polyacrylonitrile (PAN) nanofibers and the MOF skeleton could jointly accommodate the violent volume variation during cycling, enabling Sn@C@CNF to have excellent cycle stability. The Sn@C@CNF anode exhibited a stable discharge specific capacity of 610.8 mAh g(-1) under 200 mA g(-1) for 180 cycles in lithium ion batteries (LIBs) and 360.5 mAh g(-1) under 100 mA g(-1) after 100 cycles in sodium ion batteries (SIBs). As a flexible electrode, Sn@C@CNF demonstrated a stable electromechanical response to repeated 'bending-releasing' cycles and excellent electrochemical performance when assembled in a soft-pack half-LIB. This strategy provided promising candidates of active materials and fabrication methods for advanced flexible batteries.
机译：高可逆容量柔性电极的简易合成在满足日益增长的柔性电池需求方面起着关键作用。在此，我们利用静电纺丝技术将Sn基金属有机骨架（Sn-MOF）模板引入交联的一维碳纳米纤维（CNF）中，获得了分级多孔膜(Sn@C@碳热还原反应后。揭示了这种修饰策略的优点及其改善纳米锡（NPs）电化学性能的机理。静电纺丝CNFs基底确保了高导电性骨架和优异的机械韧性，使Sn@C@CNF是一种自支撑无粘结剂电极。Sn-MOF作为一种自我牺牲的模板，提供Sn-np，并在热解后在cnf上衍生成多孔结构。碳衬底的分级多孔结构有利于增强活性材料的Li+/Na+储存，而聚丙烯腈（PAN）纳米纤维和MOF骨架衍生的碳包裹物可以共同适应循环过程中剧烈的体积变化，从而实现Sn@C@CNF具有优异的循环稳定性。这个Sn@C@在锂离子电池（LIB）中，CNF阳极在200 mA g（-1）下的放电比容量为610.8 mAh g（-1），在锂离子电池（LIB）中的放电比容量为180次循环，在100 mA g（-1）下的放电比容量为360.5 mAh g（-1），在钠离子电池（SIB）中的放电比容量为100次循环。作为一个柔性电极，Sn@C@CNF在软包装半LIB中组装时，对重复的“弯曲-释放”循环表现出稳定的机电响应和优异的电化学性能。这一策略为先进的柔性电池的活性材料和制造方法提供了有希望的候选材料。

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