Selenium-impregnated hollow carbon microspheres as efficient cathode materials for lithium-selenium batteries
Selenium-impregnated hollow carbon microspheres as efficient cathode materials for lithium-selenium batteries
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DOI：
10.1016/j.carbon.2016.09.069
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发表时间：
2017-01-01
期刊：
影响因子：
10.9
通讯作者：
Kang, Yun Chan
中科院分区：
文献类型：
--
作者：
Hong, Young Jun;Kang, Yun Chan
研究了含硒中空碳（C-Se）微球作为锂硒电池正极材料。在一锅喷雾热解法制备的核壳结构SnO2@C复合微球中，采用SnO2浸出法制备了含微孔和中孔的中空碳微球。空心碳微球的平均空核尺寸为490 nm，平均壳厚为90 nm。采用气相包合的方法将金属硒浸渍在空心碳微球中。热重分析（TGA）测得C-Se微球中的硒含量为59.5%。在0.5 a g（-1）的恒流密度下，C-Se微球第2次和第1000次循环的放电容量分别为603和525 mA h g(-1)，第2次循环的容量保持率为87%。从第10个循环开始，C-Se微球的容量保持率几乎为100%。C-Se复合微球在反复插放锂过程中的结构稳定性使其具有优异的锂离子存储性能。(C) 2016 Elsevier Ltd.版权所有。
Se-impregnated hollow carbon (C-Se) microspheres were studied as cathode materials for Li-Se batteries. Hollow carbon microspheres containing micro-and mesopores were prepared by SnO2 leaching in the core-shell-structured SnO2@C composite microspheres prepared by one-pot spray pyrolysis. The mean size of the empty cores and the mean shell thickness of the hollow carbon microspheres were 490 and 90 nm, respectively. Metallic Se was impregnated into the hollow carbon microspheres by vapor inclusion. The Se content in the C-Se microspheres was measured by thermogravimetric analysis (TGA) to be 59.5 wt%. The discharge capacities of the C-Se microspheres in the 2nd and 1,000th cycles at a constant current density of 0.5 A g(-1) were 603 and 525 mA h g(-1), respectively, and the capacity retention measured from the 2nd cycle was 87%. The capacity retention of the C-Se microspheres measured from the 10th cycle was almost 100%. The structural stability of the C-Se composite microspheres during repeated Li-insertion and desertion process resulted in excellent Li-ion storage performance. (C) 2016 Elsevier Ltd. All rights reserved.