Hollow Cobalt Selenide Microspheres: Synthesis and Application as Anode Materials for Na-Ion Batteries
Hollow Cobalt Selenide Microspheres: Synthesis and Application as Anode Materials for Na-Ion Batteries
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DOI：
10.1021/acsami.5b11963
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发表时间：
2016-03-16
影响因子：
9.5
通讯作者：
Kang, Yun Chan
中科院分区：
文献类型：
--
作者：
Ko, You Na;Choi, Seung Ho;Kang, Yun Chan
首次研究了空心钴氧化物和硒化钴微球作为钠离子电池负极材料的电化学性能。采用一锅法喷雾热分解制备空心氧化钴微球，通过简单的硒化过程，利用硒化氢气体将其转化为空心硒化钴微球。在300 ℃硒化的钴硒化物微球中保留了Co 3 O 4微球的超细纳米晶体。在300和400 ℃下硒化的Co 3 O 4和硒化钴微球在500 mA g（-1）的电流密度下的初始放电容量分别为727、595和586 mA h g（-1）。对于相同样品，40次循环后的放电容量分别为348、467和251 mA h g（-1），并且从第二次循环开始测量的它们的容量保持率分别为66、91和50%。空心硒化钴微球比空心氧化钴微球具有更好的倍率性能。
The electrochemical properties of hollow cobalt oxide and cobalt selenide microspheres are studied for the first time as anode materials for Na-ion batteries. Hollow cobalt oxide microspheres prepared by one-pot spray pyrolysis are transformed into hollow cobalt selenide microspheres by a simple selenization process using hydrogen selenide gas. Ultrafine nanocrystals of Co3O4 microspheres are preserved in the cobalt selenide microspheres selenized at 300 degrees C. The initial discharge capacities for the Co3O4 and Cobalt selenide microspheres selenized at 300 and 400 degrees C are 727, 595, and 586 mA h g(-1), respectively, at a current density of 500 mA g(-1). The discharge capacities after 40 cycles for the same samples are 348, 467, and 251 mA h g(-1), respectively, and their capacity retentions measured from the second cycle onward are 66, 91, and 50%; respectively. The hollow cobalt selenide microspheres have better rate performances than the hollow cobalt oxide microspheres.