Fabrication of NiO nanowall electrodes for high performance lithium ion battery
Fabrication of NiO nanowall electrodes for high performance lithium ion battery
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DOI：
10.1021/cm703512k
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发表时间：
2008-05-27
影响因子：
8.6
通讯作者：
Sow, Chorng-Haur
中科院分区：
文献类型：
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作者：
Varghese, Binni;Reddy, M. V.;Sow, Chorng-Haur
我们报道了用等离子体辅助氧化法在镍箔上制备垂直取向的NiO纳米球。通过恒电流循环和循环伏安法对合成的NiO纳米球的电化学性能进行了评价。结果显示，当在0.005-3.0 V vs Li的范围内循环时，容量接近638（mA h）/g（在1.25 C倍率下），具有高达85次循环的优异容量保持率。与先前报道的纳米尺寸的NiO颗粒的结果相比，NiO球的上级电化学性能可以归因于其大的表面积和用于质量和电荷传输的较短的扩散长度。讨论了可能的反应机理。我们还报告说，电子场发射研究表明，垂直排列的NiO纳米壁是高效的场发射体，其开启场为7.4 V/μ m，最大电流密度可达到类似于160 μ A/cm（2）。
We report the fabrication of vertically aligned NiO nanowalls on nickel foils using a plasma assisted oxidation method. Electrochemical properties of as-synthesized NiO nanowalls were evaluated by galvanostatic cycling and cyclic voltammetery. The results show a capacity of similar to 638 (mA h)/g (at 1.25C rate), with excellent capacity retention of up to 85 cycles, when cycled in the range, 0.005-3.0 V vs Li. The superior electrochemical performance of NiO nanowalls in comparison to the previously reported results on nanosized NiO particles can be attributed to its large surface area and shorter diffusion length for mass and charge transport. A possible reaction mechanism is discussed. We also report that electron field emission studies show that the verticllay aligned NiO nanowalls are efficient field emitters with a turn-on field of 7.4 V/mu m and a maximum current density of similar to 160 mu A/cm(2) can be achieved.