Abstract
An interlayer nanostructure of rGO/Sn2Fe-NRs array/rGO was synthesized via a versatile integration of Sn2Fe nanorods (NRs) array in between reduced graphene oxide (rGO) nanosheets. Impressively, as an anode material for lithium ion batteries, the as-prepared nanocomposites deliver a high specific capacity of 690 mA h g−1 at a current density of 0.5 C (500 mA g−1), and 582 mA h g−1at 1 C (1000 mA g−1) with exceptional rate capability and cycling stability over 600 cycles. These significantly improved electrochemical properties benefit from the high structural stability and electrical conductivity of rGO/Sn2Fe-NRs array/rGO interlayer nanostructures. It is demonstrated that the designed interlayer nanostructures are outstanding architectures for lithium ion battery anodes.
摘要
基于阵列夹层纳米结构的稳定性和石墨烯的电子传递特性, 本文通过原位生长的层间组装过程, 获得了一类新型的rGO/Sn2Fe-NRs 阵列/rGO层间纳米结构复合材料. 该结构中, Sn2Fe纳米合金棒阵列排布于rGO纳米层之间. 将此材料应用于锂离子电池负极, 可以促进电 极反应中的物质传输, 并能有效避免副反应产生, 从而表现出优异的倍率性和循环稳定性, 并在高电流密度下保持高比容量. 在电流密度分 别为0.5 C (500 mA g−1)和1 C (1000 mA g−1)时, 比容量分别达到690 mA h g−1和582 mA h g−1. 本工作对促进电化学性能优异的锂离子电池负极 材料发展具有重要的意义.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (21171130, 51271132 and 91122025), and the National Basic Research Program of China (2011CB932404).
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Chenxiang Wang obtained his BSc degree in chemistry at Tongji University in 2013. He obtained his MSc degree from the Department of Chemical and Biological Engineering at Northwestern University in 2016. After that he joined Professor MingWen’s group at the School of Chemical Science and Engineering at Tongji University. His scientific interests lie in the fabrication and characterization of electrode materials for lithium-ion batteries and supercapacitors, and electrocatalysts for fuel cells.
Jie Wang received his BE degree in material science and engineering at Wenzhou University in 2012. He obtained his MSc degree from the School of Chemical Science and Engineering at Tongji University in 2016. His research interests are synthesis and characterization of multi-component alloy nanostructures and alloy-carbon nanocomposites for energy applications, including electrode materials for lithium ion batteries.
Ming Wen received her PhD degree in analysis chemistry at Kinki University in 2002. She is a professor in the School of Chemical Science and Engineering at Tongji University. Her primary research interests cover inorganic chemistry and material science with comprehensive applications for energy, environments, including alloy and their oxide composite materials at nano- and micro-scales with controllable structures, which are achieved by various chemical interactions and controlled self-assembly.
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Wang, C., Wang, J., Chen, H. et al. An interlayer nanostructure of rGO/Sn2Fe-NRs array/rGO with high capacity for lithium ion battery anodes. Sci. China Mater. 59, 927–937 (2016). https://doi.org/10.1007/s40843-016-5086-7
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DOI: https://doi.org/10.1007/s40843-016-5086-7