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摘要
通过水热法制备出纳米Fe2O3颗粒吸附于三维网状结构的碳纳米纤维(BC-CNFs)中,得到Fe2O3/BC-CNFs。Fe2O3/BC-CNFs的电化学性能相对于聚集的Fe2O3纳米颗粒有很大的提高,表明在整个电极循环过程BC-CNFs对与Fe2O3的机械稳定性和导电性以及防止纳米颗粒聚集起到关键性的作用,并且Fe2O3/BC-CNFs网状结构中存在大量的相互连接的多孔结构,有助于锂离子的快速分散和传递。以200mA/g的电流循环100次具有500mAh/g稳定的比容量,其较高的可逆容量和良好的倍率性能主要归因于三维网状多孔结构以及Fe2O3纳米颗粒在其内部纤维表面良好的分散性。
Abstract
Nano Fe2O3 was anchored on three-dimensional (3D) carbon nanofiber (CNFs) aerogels (Fe2O3/BC-CNFs) by hydrothermal route.The significant improved cycling performance of Fe2O3/BC-CNFs when compared to the bare Fe2O3 clearly indicated that the introduced BC-CNFs played a critical role in mechanically and electrically binding Fe2O3 nanoparticles together at the whole electrode scale,and also offering numerous interconnected voids in the porous Fe2O3/BC-CNFs hybrid which was favorable for the fast diffusion and transport of lithium ions.In addition to its excellent flexibility,a stable capacity of 500mAh/g for up to 100 cycles was also higher than most of carbon-Fe2O3 hybrids.The high reversible capacity and excellent rate capability were attributed to its 3D porous network structure with well-dispersed Fe2O3 nanoparticles on the surfaces of CNFs.
关键词
碳纳米纤维
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细菌纤维素
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复合材料
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电化学性能
Key words
carbon nanofiber
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bacterial cellulose
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composite
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electrochemical performance
三维Fe2O3/BC-CNFs复合负极材料的电化学性能研究[J].
化工新型材料, 2018, 46(4): 131-134 DOI:
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