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首页> 外文期刊>RSC Advances >Three-dimensional ultrathin Sn/polypyrrole nanosheet network as high performance lithium-ion battery anode
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Three-dimensional ultrathin Sn/polypyrrole nanosheet network as high performance lithium-ion battery anode

机译：三维超薄锡/聚吡咯纳米片网络作为高性能锂离子电池阳极

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摘要

In order to optimize the electrode system of lithium-ion batteries for problems such as lithium ion diffusion, electron transportation, and large volume changes during cycling processes, a novel anode material composed of ultrafine Sn nanoparticles (similar to 5 nm) anchored inside a well-connected three-dimensional (3D) polypyrrole (PPy) nanosheet network has been designed and synthesized through a simple microemulsion-based preparation of tin nanoparticles with organic crystal surface-induced PPy polymerization. In this electrode material, the ultrathin PPy coating (similar to 3-4 nm) plays a "flexible confinement" function to preserve the structural and interfacial stabilization of inner Sn nanoparticles as well as a "binder" function to suppress the detachment of Sn from the collector. Meanwhile, the continuous conductive PPy nanosheet network with open structures and large contact surface for Sn nanoparticle dispersion can provide easy access for Li+ intercalation. As a result, the integration of a 3D conductive network and ultrafine Sn nanoparticles with an ultrathin in situ PPy coating induces improved structural integrity and accessible capacity for Sn nanoparticle electrodes. It delivered a high capacity retention of 766 mA h g(-1) after 200 cycles at the current density of 0.2 A g(-1) and a reversible capacity of 583 mA h g(-1) when kept at a much higher current density of 2 A g(-1).
机译：为了优化锂离子电池的电极系统以解决诸如锂离子扩散，电子传输和循环过程中体积变化之类的问题，一种由超细锡纳米颗粒（类似于5 nm）组成的新型阳极材料固定在孔中连接的三维（3D）聚吡咯（PPy）纳米片网络已通过有机晶体表面诱导的PPy聚合通过基于微乳液的锡纳米粒子的简单制备方法进行了设计和合成。在这种电极材料中，超薄PPy涂层（类似于3-4 nm）具有“柔性限制”功能，可保持内部Sn纳米颗粒的结构和界面稳定性，还具有“粘合剂”功能，可抑制Sn从纳米颗粒上脱离收藏者。同时，具有开放结构的连续导电PPy纳米片网络和锡纳米粒子分散的大接触表面可为Li +插层提供便捷通道。结果，将3D导电网络和超细Sn纳米颗粒与超薄原位PPy涂层相结合，可以改善结构完整性和Sn纳米颗粒电极的可利用容量。在200个循环中，在0.2 A g（-1）的电流密度下，它具有766 mA hg（-1）的高容量保持能力;在更高的电流密度下，可逆容量为583 mA hg（-1）。 2 A g（-1）。

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