One-pot solvothermal synthesis of ZnFe2O4 nanospheres/graphene composites with improved lithium-storage performance
One-pot solvothermal synthesis of ZnFe2O4 nanospheres/graphene composites with improved lithium-storage performance
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DOI：
10.1016/j.materresbull.2015.01.057
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发表时间：
2015-05-01
影响因子：
5.4
通讯作者：
Du, Gaohui
中科院分区：
文献类型：
--
作者：
Shi, Jingjing;Zhou, Xiaoyan;Du, Gaohui
报道了一种简便的溶剂热一锅法合成ZnFe 2 O 4/石墨烯纳米复合材料的方法。XRD、SEM和TEM结果表明，ZnFe 2 O 4纳米球均匀地分散在石墨烯纳米片上，粒径约为100-200 nm。每个ZnFe 2 O 4纳米球由许多10 nm左右的纳米颗粒组装而成。ZnFe 2 O 4/石墨烯纳米复合材料作为锂离子电池负极进行评价时，首次放电容量为1400 mAh g（-1），50次循环后可逆容量仍高达704.2 mAh g（-1）。ZnFe 2 O 4/石墨烯纳米复合材料在800 mA g（-1）的电流下也表现出271.8 mAh g（-1）的改善的倍率容量，当电流密度降低到100 mA g（-1）时，其可以恢复到814 mAh g（-1）。复合材料的电化学性能的提高归因于石墨烯的限制和导电效应以及导电石墨烯和ZnFe 2 O 4纳米球之间的协同效应。(C)2015爱思唯尔有限公司版权所有。
We report a facile one-pot solvothermal route for synthesizing ZnFe2O4/graphene nanocomposites. XRD, SEM and TEM results demonstrate that ZnFe2O4 nanospheres with a size of about 100-200 nm are uniformly dispersed on graphene nanosheets. Each ZnFe2O4 nanosphere is assembled by many nanoparticles around 10 nm. When evaluated as anode for Li-ion batteries, ZnFe2O4/graphene nanocomposites deliver a first discharge capacity of 1400 mAh g(-1) and remain a reversible capacity up to 704.2 mAh g(-1) after 50 cycles. ZnFe2O4/graphene nanocomposites also exhibit ameliorative rate capacity of 271.8 mAh g(-1) at the current of 800 mA g(-1), which can recover to 814 mAh g(-1) when the current density is reduced back to 100 mA g(-1). The enhanced electrochemical performances of the nanocomposites are ascribed to the confining and conducting effects of graphene and the synergistic effects between the conductive graphene and ZnFe2O4 nanospheres. (C) 2015 Elsevier Ltd. All rights reserved.