Sb nanocrystal-anchored hollow carbon microspheres for high-capacity and high-cycling performance lithium-ion batteries
Sb nanocrystal-anchored hollow carbon microspheres for high-capacity and high-cycling performance lithium-ion batteries
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DOI：
10.1088/1361-6528/ab5f91
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发表时间：
2019-12
期刊：
影响因子：
3.5
通讯作者：
M. Guo;Jiajun Chen;Weijia Meng;Liyu Cheng;Zhongchao Bai;Zhihua Wang;Fuqian Yang
中科院分区：
文献类型：
--
作者：
M. Guo;Jiajun Chen;Weijia Meng;Liyu Cheng;Zhongchao Bai;Zhihua Wang;Fuqian Yang
非常需要开发高能量和高容量密度的可持续和清洁的能量存储设备和系统。在这项工作中，我们通过煅烧培养的酵母细胞和在乙二醇溶液中的SbCl 3在中空碳微球表面上的还原合成锑（Sb）纳米晶锚定的中空碳微球（Sb@HCMs）。Sb@ HCM具有中空和多孔结构，并且Sb以纳米晶体的形式存在。以Sb@ HCM为活性电极材料，组装了锂离子半电池和全电池，并研究了它们的电化学性能。锂离子半电池在100 mA g−1的电流密度下100次循环后的充电容量为605 mA h g−1，在高达1600 mA g− 1的电流密度下的充电容量为469.9 mA h g− 1，远高于商用石墨电极的理论容量372 mA h g−1。具有Sb@ HCM//LiCoO 2的锂离子全电池在50次循环后在0.2 A g−1的电流密度下提供300 mA h g− 1的充电容量，并且在能量存储应用中具有潜力。
There is a great need to develop sustainable and clean energy storage devices and systems of high-energy and high-capacity densities. In this work, we synthesize antimony (Sb) nanocrystal-anchored hollow carbon microspheres (Sb@HCMs) via the calcination of cultivated yeast cells and the reduction of SbCl3 in an ethylene glycol solution on the surface of hollow carbon microspheres. The Sb@HCMs possess hollow and porous structure, and the Sb is present in the form of nanocrystals. Using the Sb@HCMs as the active-electrode material, we assemble lithium (Li)-ion half cells and full cells and investigate their electrochemical performance. The Li-ion half cells possess a charge capacity of 605 mA h g−1 after 100 cycles at a current density of 100 mA g−1 and a charge capacity of 469.9 mA h g−1 at a current density up to 1600 mA g−1, which is much higher than the theoretical capacity of 372 mA h g−1 for commercial graphite electrode. The Li-ion full cells with Sb@HCMs//LiCoO2 deliver a charge capacity of 300 mA h g−1 at a current density of 0.2 A g−1 after 50 cycles, and have potential in applications of energy storage.