阳极
材料科学
聚吡咯
碳化
碳纳米管
电化学
纳米颗粒
锂(药物)
化学工程
纳米技术
复合材料
电导率
硅
电极
聚合物
扫描电子显微镜
化学
冶金
内分泌学
物理化学
工程类
医学
聚合
作者
Gabriela Soukupová,Martin Jindra,Tomáš Lapka,Zuzana Živcová Vlčková,Marcela Dendisová,Ján Prokeš,Otakar Frank,Fatima Hassouna
标识
DOI:10.1016/j.jpowsour.2023.233976
摘要
The development of elastic nanostructured Si-based anodes holds promise for advancing lithium-ion batteries due to the high theoretical specific capacity exhibited by Si. Combining nanostructured Si with C proves to be a successful strategy in addressing the challenges tied to the substantial volume expansion of Si during lithiation. In this work, a novel Si-based anode is fashioned through a simple and universal strategy, integrating Si nanoparticles with 1D nano-carbonaceous fillers (CPPy-NT) featuring nanotubular morphology and N atoms, and a water-based binder (poly(acrylic acid)). CPPy-NT are derived by carbonizing pre-synthesized polypyrrole nanotubes (PPy-NT). A clear correlation is established among the carbonization temperature for CPPy-NT preparation, N content in CPPy-NT, electrical conductivity, and the electrochemical performance of the ensuing Si/CPPy-NT anode. For comparative analysis, the electrochemical properties of the Si-based anode employing Super P (commercial carbon black) or PPy-NT are contrasted with those of Si/CPPy-NT. Notably, the Si/CPPy-NT anode with CPPy-NT bearing the highest amount of graphitic N sites exhibits a substantial improvement in initial charge capacity (approximately 2200 mAh g−1) and enhanced cycling stability. These findings underscore the potential to elevate the electrochemical activity of the C filler by carefully optimizing morphology, conductivity, and the incorporation of an appropriate amount of graphitic N.
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