A coral-inspired nanoscale design of Sn–Cu/PANi/GO hybrid anode materials for high performance lithium-ion batteries
A coral-inspired nanoscale design of Sn–Cu/PANi/GO hybrid anode materials for high performance lithium-ion batteries
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DOI：
10.1039/c4ra17041e
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发表时间：
2015-02
期刊：
影响因子：
3.9
通讯作者：
P. Dou;Anni Jiang;Xin Fan;D. Ma;Xinhua Xu
中科院分区：
文献类型：
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作者：
P. Dou;Anni Jiang;Xin Fan;D. Ma;Xinhua Xu
开发了一种简便且可扩展的合成方法，用于制造均匀嵌入空心锡铜纳米颗粒（Sn-Cu NP）的三维（3D）聚苯胺（PANi）/氧化石墨烯（GO）混合水凝胶，作为锂离子电池的高性能阳极。通过苯胺单体在 Sn-Cu NPs 和 GO 纳米片表面的原位聚合制备了多级导电水凝胶。使用扫描电子显微镜（SEM）和透射电子显微镜（TEM）对所得杂化材料的形态和结构进行了表征。具有树枝状 PANi 纳米纤维和 2D GO 纳米片的分层导电水凝胶框架可作为连续的 3D 电子传输网络和高孔隙率，以适应 Sn-Cu NP 的体积膨胀。 PANi涂层发挥“人工SEI”功能，在循环过程中保持Sn-Cu NPs的结构和界面稳定性。这种3D混合阳极的结果是，在0.2 C的电流倍率下经过200次循环后，可逆放电容量超过693 mA h g−1，并且在更高的2 C电流倍率下可逆放电容量保持在371 mA h g−1，这表明这种新型的Sn-Cu/PANi/GO复合材料是一种有前途的储能应用候选材料。
A facile and scalable synthesis approach is developed for fabrication of a three-dimensional (3D) polyaniline (PANi)/graphene oxide (GO) hybrid hydrogel evenly embed with hollow Sn–Cu nanoparticles (Sn–Cu NPs) as high performance anode for lithium-ion batteries. The hierarchical conductive hydrogel was prepared via in situ polymerization of aniline monomer on the surface of Sn–Cu NPs and GO nanosheets. The morphology and structure of the resulting hybrid materials have been characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The hierarchical conductive hydrogel framework with dendritic PANi nanofibers and 2D GO nanosheets serve as a continuous 3D electron transport network and high porosity to accommodate the volume expansion of Sn–Cu NPs. The PANi coating plays an “artificial SEI” function to preserve the structural and interfacial stabilization of Sn–Cu NPs during the cycling processes. As a consequence of this 3D hybrid anode, an extremely long stable cycling performance is achieved with reversible discharge capacity over 693 mA h g−1 after 200 cycles at current rate of 0.2 C and a reversible capacity of 371 mA h g−1 retention at a much higher current rate of 2 C, suggesting that this novel Sn–Cu/PANi/GO composite is a promising candidate for energy storage applications.