Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Republic of Korea.
Nanoscale. 2018 Mar 1;10(9):4370-4376. doi: 10.1039/c7nr07208b.
SnO-FeO-C triple-shell hollow nano-spheres are fabricated by combining the template-based sol-gel coating technique and hydrothermal method, and their electrochemical performance as an anode for lithium ion batteries (LIBs) is investigated, particularly focusing on their structural stability and long term cyclability. To accomplish this, same-sized SnO solid spheres, FeO solid spheres, SnO-FeO solid spheres, SnO-FeO-C solid spheres, SnO hollow spheres and SnO-FeO hollow spheres are prepared in a similar manner and their cyclic performances are compared. It is found that the as-synthesized 80 nm-sized SnO-FeO-C hollow sphere electrode exhibits an extraordinary reversible capacity (1100 mA h g after 100 cycles at 200 mA g) and excellent long cycle stability (475 mA h g after 1000 cycles at 2000 mA g), which are attributed to the Fe-enhanced reversibility of the LiO reduction reaction, high electrical conductivity, high Li ion mobility, and structural stability of the carbon-coated triple-shell hollow spheres.
SnO-FeO-C 三壳空心纳米球是通过结合模板基溶胶-凝胶涂层技术和水热法制备的，并研究了它们作为锂离子电池（LIBs）阳极的电化学性能，特别关注其结构稳定性和长期循环性能。为此，以相似的方式制备了相同尺寸的 SnO 固体球、FeO 固体球、SnO-FeO 固体球、SnO-FeO-C 固体球、SnO 空心球和 SnO-FeO 空心球，并比较了它们的循环性能。结果发现，合成的 80nm 尺寸的 SnO-FeO-C 空心球电极具有出色的可逆容量（在 200mA g 下循环 100 次后为 1100mAh g）和优异的长循环稳定性（在 2000mA g 下循环 1000 次后为 475mAh g），这归因于 Fe 增强了 LiO 还原反应的可逆性、高导电性、高锂离子迁移率以及碳包覆三壳空心球的结构稳定性。
