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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Design and synthesis of porous nano-sized Sn@C/graphene electrode material with 3D carbon network for high-performance lithium-ion batteries
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Design and synthesis of porous nano-sized Sn@C/graphene electrode material with 3D carbon network for high-performance lithium-ion batteries

机译：具有3D碳网络的多孔纳米SN @ C /石墨烯电极材料的设计与合成高性能锂离子电池

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摘要

Tin is a promising high-capacity anode material for lithium-ion batteries, but it usually suffers from the problem of poor cycling stability due to the large volume change during the charge-discharge process. In this article, porous nano-sized Sn@C/graphene electrode material with three-dimensional carbon network was designed and prepared. Reducing the size of the Sn particles to nanoscale can mitigate the absolute strain induced by the large volume change during lithiation-delithiation process, and retard particle pulverization. The porous structure can provide a void space, which helps to accommodate the volume changes of the Sn nanoparticles during the lithium uptake-release process. The carbon shell can avoid the aggregation of the Sn nanoparticles on the same piece of graphene and detachment of the pulverized Sn particles during the charge-discharge process. The 3D carbon network consisted of graphene sheets and carbon shells can not only play a structural buffering role in minimizing the mechanical stress caused by the volume change of Sn, but also keep the overall electrode highly conductive during the lithium uptake-release process. As a result, the as-prepared Sn@C/graphene nanocomposite as an anode material for lithium-ion batteries exhibited outstanding cyclability. The reversible specific capacity is almost constant from the tenth cycle to the fiftieth cycle, which is about 600 mA h g~(-1). The strategy presented in this work may be extended to improve the cycle performances of other high-capacity electrode materials with large volume variations during charge-discharge processes.
机译：锡是用于锂离子电池的有希望的高容量阳极材料，但由于在充电 - 放电过程中由于大的体积变化而导致循环稳定性较差的问题。在本文中，设计并制备了具有三维碳网络的多孔纳米大小Sn @ C / Graphene电极材料。将Sn颗粒的大小降低至纳米级可以减轻通过锂化脱脂过程中的大体积变化引起的绝对菌株，并延迟颗粒粉碎。多孔结构可以提供空隙空间，这有助于在锂摄取释放过程中容纳Sn纳米颗粒的体积变化。碳壳可以避免在相同的石墨烯上的Sn纳米颗粒的聚集在充电 - 放电过程中粉碎的Sn颗粒的拆卸。由石墨烯片和碳壳组成的3D碳网络不能仅在最小化由Sn的体积变化引起的机械应力中起结构缓冲作用，而且在锂摄取释放过程中保持整体电极高度导电。结果，作为用于锂离子电池的阳极材料的AS制备的SN / Graphene纳米复合材料表现出优异的可循环性。可逆的特定容量几乎常见于第十个循环到第五十个循环，这是大约600 ma H g〜（-1）。在该工作中提出的策略可以扩展，以改善电荷 - 放电过程中具有大体积变化的其他高容量电极材料的循环性能。

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