NiCo2O4 polyhedra with controllable particle size as high-performance anode for lithium-ion battery

被引:9
作者
Xia, Yuan [1 ]
Wang, Hui [1 ]
机构
[1] NW Univ Xian, Minist Educ, Coll Chem & Mat Sci, Key Lab Synthet & Nat Funct Mol Chem, Xian 710069, Peoples R China
基金
中国国家自然科学基金;
关键词
Nickel cobalt oxides; Controllable particle size; Electrochemistry; Lithium-ion battery; FACILE SYNTHESIS; NANOWIRE ARRAYS; ELECTRODES; NANOTUBES; BEHAVIOR; GROWTH;
D O I
10.1007/s11581-015-1554-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Different particle sizes of dodecahedron precursors are synthesized by controlling the polarity of the solution. Through the results of scanning electron microscope (SEM) images, it can be found that different particle sizes of precursors present obvious edge angles and their morphology can be well retained after annealing. X-ray diffraction (XRD) measurements suggest that the annealed polyhedral products are pure single-phase NiCo2O4. When tested as lithium-ion battery anode, 0.5 mu m NiCo2O4 polyhedra exhibits a specific capacity of 1050 mAh g(-1) at 0.1 C at the 60th cycle, which was higher than theoretical capacity of single metal oxide (NiO 718 mAh g(-1) and Co3O4 890 mAh g(-1)). It also exhibits the highest rate capability with an average discharge capacity of 890, 700, 490, 330, and 300 mAh g(-1) at 0.5, 2, 4, 8, and 10 C, respectively. Those advantages are attributed to that small-sized particle with great surface areas decrease the actual current density at the surface and inner of the prepared electrode.
引用
收藏
页码:159 / 166
页数:8
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