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首页> 外文期刊>RSC Advances >One-step solvothermal preparation of Fe3O4/graphene composites at elevated temperature and their application as anode materials for lithium-ion batteries
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One-step solvothermal preparation of Fe3O4/graphene composites at elevated temperature and their application as anode materials for lithium-ion batteries

机译：一步法溶剂热法制备Fe3O4 /石墨烯复合材料及其在锂离子电池负极材料中的应用

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摘要

A one-step high-temperature solvothermal process (can be used up to 400 degrees C) has been explored for the preparation of Fe3O4/graphene composites. The influence of high temperature (>230 degrees C) on the structure, morphology and electrochemical properties of the resulting Fe3O4/graphene composites was investigated by XRD, SEM, TEM and N-2 adsorption-desorption measurements. Electrochemical performances of the as-prepared Fe3O4/graphene composites at different temperatures were evaluated in coin-type cells as anode materials for lithium-ion batteries. In comparison with the traditional solvothermal method (<240 degrees C), the high-temperature method does not require an additional calcination process yet it still could result in Fe3O4/graphene composites with pure phase and excellent electrochemical properties. A preferred solvothermal temperature of 280 degrees C has been deduced based on a series of control experiments. The Fe3O4/graphene composite derived at 280 degrees C exhibited a high reversible capacity of 907 mA h g(-1) at 0.1 C (92.6 mA g(-1)) even after 65 cycles, showing outstanding cycle stability. It also exhibited a high rate capability of 410 mA h g(-1) at 2 C (1852 mA g(-1)). The role of the graphene substrates in improving the electrochemical properties of the composite is discussed based on the morphology, structure, phase and electrochemical property studies.
机译：为了制备Fe 3 O 4 /石墨烯复合材料，已经探索了一种一步式高温溶剂热法（可用于高达400摄氏度）。通过XRD，SEM，TEM和N-2吸附-脱附测量研究了高温（> 230℃）对所得Fe3O4 /石墨烯复合材料的结构，形态和电化学性能的影响。在作为锂离子电池负极材料的硬币型电池中，评估了所制备的Fe3O4 /石墨烯复合材料在不同温度下的电化学性能。与传统的溶剂热法（<240摄氏度）相比，高温法不需要额外的煅烧过程，但仍然可以使Fe3O4 /石墨烯复合材料具有纯相和出色的电化学性能。基于一系列对照实验，得出了优选的溶剂热温度为280摄氏度。即使在65个循环后，在280℃衍生的Fe3O4 /石墨烯复合物在0.1 C（92.6 mA g（-1））下仍显示907 mA h g（-1）的高可逆容量。它还在2 C（1852 mA g（-1））下表现出410 mA h g（-1）的高倍率能力。基于形态，结构，相和电化学性质的研究，讨论了石墨烯基质在改善复合材料电化学性质中的作用。

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