Core-Shell NiFe2O4@TiO2 Nanorods: An Anode Material with Enhanced Electrochemical Performance for Lithium-Ion Batteries
Core-Shell NiFe2O4@TiO2 Nanorods: An Anode Material with Enhanced Electrochemical Performance for Lithium-Ion Batteries
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DOI：
10.1002/chem.201403148
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发表时间：
2014-08-25
影响因子：
4.3
通讯作者：
Wang, Limin
中科院分区：
文献类型：
--
作者：
Huang, Gang;Zhang, Feifei;Wang, Limin
采用水热合成、化学浴沉积和随后的煅烧工艺制备了具有分级多孔结构的NiFe2O4@TiO2纳米棒。纳米棒的平均直径为48 nm，长度约为300-600 nm，结果表明具有高度均匀的形态，并由纳米尺寸的初级颗粒组成。由于各组分的协同效应以及分级多孔结构，新型核壳结构NiFe2O4@TiO2纳米棒作为锂离子电池负极材料具有上级电化学性能。在100 mA g（-1）的电流密度下，100次充放电循环后，复合材料的可逆比容量为1034 mAh g（-1），远高于未包覆的NiFe 2 O 4纳米棒。即使在2000 mA g（-1）下循环，放电容量仍保持在358 mAh g（-1）。
Hierarchical porous core-shell NiFe2O4@TiO2 nanorods have been fabricated with the help of hydrothermal synthesis, chemical bath deposition, and a subsequent calcinating process. The nanorods with an average diameter of 48 nm and length of about 300-600 nm turn out have a highly uniform morphology and are composed of nanosized primary particles. Owing to the synergistic effect of individual constituents as well as the hierarchical porous structure, the novel core-shell NiFe2O4@TiO2 nanorods exhibit superior electrochemical performance when evaluated as anode materials for lithium-ion batteries. At the current density of 100 mA g(-1), the composite exhibits a reversible specific capacity of 1034 mAh g(-1) up to 100 charge-discharge cycles, which is much higher than the uncoated NiFe2O4 nanorods. Even when cycled at 2000 mA g(-1), the discharge capacity could still be maintained at 358 mAh g(-1).