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Enhanced Electrochemical Performance of CNTs/α-Fe2O3/PPy Composite as Anode Material for Lithium Ion Batteries
Transactions of the Indian Ceramic Society ( IF 1.2 ) Pub Date : 2019-01-02 , DOI: 10.1080/0371750x.2019.1583134
Dawei Luo 1 , Jieda Wu 1 , Yongji Ni 1 , Chengcheng Wang 1 , Ning Zhao 1
Affiliation  

ABSTRACT A novel CNTs/α-Fe2O3/PPy composite with three-dimensional interconnected network structure is successfully synthesized through a solvothermal method and in-situ polymerization. The as-synthesized CNTs/α-Fe2O3/PPy composite is characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results indicate that spherical α-Fe2O3 particles are densely anchored onto the three-dimensional CNTs conducting network, and the outer PPy layer deposits uniformly on the surface of α-Fe2O3 particles. As an anode material for lithium-ion battery, the CNTs/α-Fe2O3/PPy composite exhibits a high initial coulombic efficiency of 75.6%, a high specific capacity of 1095.4 mAh·g–1 at a current rate of 100 mA·g–1 after 50 cycles, as well as a good rate capability at elevated current rates. Compared with pure α-Fe2O3, the improved Li storage property could be ascribed to the synergistic effects of α-Fe2O3, CNTs and PPy layer. This unique structure not only possesses excellent conductivity under the joint effect of inner randomly distributed CNTs and outer coated PPy layer, which effectively shortens the transfer paths of lithium ions and reduces the contact resistance, but also the outer PPy protective layer prevents agglomeration of α-Fe2O3 upon cont inuous charging/discharging, which withstands huge stresses caused by α-Fe2O3 expansion/extraction. T he CNTs/α-Fe2O3/PPy composite has the potential for use as high-performance anode electrode for Li-ion batteries. GRAPHICAL ABSTRACT

中文翻译:

碳纳米管/α-Fe2O3/PPy复合材料作为锂离子电池负极材料的电化学性能增强

摘要 通过溶剂热法和原位聚合,成功合成了具有三维互连网络结构的新型 CNTs/α-Fe2O3/PPy 复合材料。合成的 CNTs/α-Fe2O3/PPy 复合材料通过扫描电子显微镜、透射电子显微镜和 X 射线衍射进行表征。结果表明,球形 α-Fe2O3 颗粒紧密固定在三维 CNTs 导电网络上,外层 PPy 层均匀沉积在 α-Fe2O3 颗粒表面。作为锂离子电池负极材料,CNTs/α-Fe2O3/PPy复合材料在100 mA·g-的电流速率下具有75.6%的初始库仑效率和1095.4 mAh·g-1的高比容量。 50 次循环后为 1,并且在高电流速率下具有良好的倍率能力。与纯α-Fe2O3相比,锂储存性能的改善可归因于α-Fe2O3、CNTs和PPy层的协同作用。这种独特的结构不仅在内部随机分布的碳纳米管和外部包覆的PPy层的共同作用下具有优异的导电性,有效缩短了锂离子的传输路径,降低了接触电阻,而且外部的PPy保护层可以防止α- Fe2O3 在连续充电/放电时,可承受由 α-Fe2O3 膨胀/提取引起的巨大应力。CNTs/α-Fe2O3/PPy 复合材料具有用作锂离子电池高性能阳极的潜力。图形概要 这种独特的结构不仅在内部随机分布的碳纳米管和外部包覆的PPy层的共同作用下具有优异的导电性,有效缩短了锂离子的传输路径,降低了接触电阻,而且外部的PPy保护层可以防止α- Fe2O3 在连续充电/放电时,可承受由 α-Fe2O3 膨胀/提取引起的巨大应力。CNTs/α-Fe2O3/PPy 复合材料具有用作锂离子电池高性能阳极的潜力。图形概要 这种独特的结构不仅在内部随机分布的碳纳米管和外部包覆的PPy层的共同作用下具有优异的导电性,有效缩短了锂离子的传输路径,降低了接触电阻,而且外部的PPy保护层可以防止α- Fe2O3 在连续充电/放电时,可承受由 α-Fe2O3 膨胀/提取引起的巨大应力。CNTs/α-Fe2O3/PPy 复合材料具有用作锂离子电池高性能阳极的潜力。图形概要 可承受由 α-Fe2O3 膨胀/提取引起的巨大应力。CNTs/α-Fe2O3/PPy 复合材料具有用作锂离子电池高性能阳极的潜力。图形概要 可承受由 α-Fe2O3 膨胀/提取引起的巨大应力。CNTs/α-Fe2O3/PPy 复合材料具有用作锂离子电池高性能阳极的潜力。图形概要
更新日期:2019-01-02
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