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/Sn_2Fe-NRs阵列/rGO层间纳米结构复合材料.该结构中,Sn_2Fe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0.5C(500 mA g^(-1))和1C(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.
An interlayer nanostructure of rGO/Sn_2Fe-NRs array/rGO was synthesized via a versatile integration of Sn_2Fe 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^(-1) at 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/Sn_2Fe-NRs array/rGO interlayer nanostructures.It is demonstrated that the designed interlayer nanostructures are outstanding architectures for lithium ion battery anodes.
基金
supported by the National Natural Science Foundation of China(21171130,51271132 and 91122025)
the National Basic Research Program of China(2011CB932404)
