Self-assembled flower-like NiFe2O4 decorated on 2D graphene nanosheets composite and their excellent electrochemical performance as anode materials for LIBs
Self-assembled flower-like NiFe2O4 decorated on 2D graphene nanosheets composite and their excellent electrochemical performance as anode materials for LIBs
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DOI：
10.1016/j.jallcom.2016.06.244
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发表时间：
2016-11-25
影响因子：
6.2
通讯作者：
Li, Suping
中科院分区：
文献类型：
--
作者：
Chen, Xuefang;Huang, Ying;Li, Suping
采用一锅水热法和一锅热处理法分别制备了二维石墨烯纳米片复合材料上的花状NiFe2O4和二维石墨烯纳米片复合材料上的球形NiFe2O4。在精心设计的三维体系中，2D石墨烯纳米片作为导电基质支撑花状NiFe2O4和球形NiFe2O4。这种结构综合了石墨烯纳米片的优点，保持了电极的活性和完整性，提高了电化学性能。比较了两种复合材料作为负极材料的储锂性能。结果表明，花状NiFe2O4/石墨烯复合材料具有较好的电化学性能和循环稳定性。首次放电容量为2632.6 mA h/g，循环50次后的可逆容量为606.2 mA h/g，库仑效率为98.86%。修饰在二维石墨烯纳米片上的花状NiFe2O4具有优异的电化学性能，有望成为锂离子电池潜在的候选负极材料。本研究通过合理控制负极材料的结构和组成，为提高过渡金属氧化物的锂离子存储容量提供了可能。(C)2016爱思唯尔B.V.保留所有权利。
Flower-like NiFe2O4 decorated on 2D graphene nanosheets composite and spherical NiFe2O4 decorated on 2D graphene nanosheets composite have been synthesized through an easy method including one-pot hydrothermal route and one-pot heat treatment, respectively. In the well-designed 3D dimensional system, 2D graphene nanosheets work as conductive matrix to support the flower-like NiFe2O4 and spherical NiFe2O4. The structure integrates the advantage of graphene nanosheets to preserve the electrode activity and integrity, improving the electrochemical performance. Lithium storage properties of the two kind of composites are compared as anode materials. The results presented that flower-like NiFe2O4/graphene composite shows better electrochemical performance and cycling stability. The first discharge capacity is 2632.6 mA h/g at a high current density of 100 mA/g. After 50 cycles, the reversible capacity is 606.2 mA h/g and the coulomb efficiency reaches at 98.86%. With the excellent electrochemical properties, flower-like NiFe2O4 decorated on 2D graphene nanosheets could be a kind of promising potential candidate anode materials for LIBs. This research offers possibility to improve the lithium ion storage capacity of transition metal oxides through advisablely controlling the architecture and composition of anode materials. (C) 2016 Elsevier B.V. All rights reserved.