Ultrafast Synthesis of Yolk-Shell and Cubic NiO Nanopowders and Application in Lithium Ion Batteries

被引:99
|
作者
Choi, Seung Ho [1 ]
Kang, Yun Chan [1 ]
机构
[1] Konkuk Univ, Dept Chem Engn, Seoul 143701, South Korea
基金
新加坡国家研究基金会;
关键词
yolk shell; nanocubic; anode material; lithium ion battery; spray pyrolysis; flame spray pyrolysis; HIGH-PERFORMANCE ANODE; POT FACILE SYNTHESIS; HOLLOW MICROSPHERES; ELECTROCHEMICAL PROPERTIES; REVERSIBLE CAPACITY; NANOSTRUCTURES; NANOPARTICLES; STORAGE; SPHERES; HYBRID;
D O I
10.1021/am404232x
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A continuous one-pot method was employed to synthesize yolk-shell and single-crystalline cubic NiO powders in a few seconds. Submicrometer-sized NiO yolk-shell particles were prepared by spray pyrolysis at 900 degrees C. Single-crystalline cubic NiO nanopowders were prepared by one-pot flame spray pyrolysis from NiO vapors. Particle surface areas of the yolk-shell and single-crystalline cubic NiO powders as obtained using the Brunauer-Emmett-Teller method were 8 and 5 m(2) g(-1), respectively. The mean crystallite sizes of the yolk-shell-structured and cubic NiO powders were 50 and 80 nm, respectively. The yolk-shell and single-crystalline cubic NiO powders delivered discharge capacities of 951 and 416 mA h g(-1), respectively, after 150 cycles, and the corresponding capacity retentions measured after the first cycle were 106 and 66%, respectively. The yolk-shell-structured NiO powders showed rate performance better than that of the single-crystalline cubic NiO nanopowders. Even at a high current density of 1 A g(-1), the discharge capacity of the yolk-shell-structured NiO powders was as high as 824 mA h g(-1) after 50 cycles, in which the current densities were increased stepwise.
引用
收藏
页码:2312 / 2316
页数:5
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