Synthesis of hierarchical worm-like SnO2@C aggregates and their enhanced lithium storage properties

Synthesis of hierarchical worm-like SnO2@C aggregates and their enhanced lithium storage properties
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多级蠕虫状SnO2@C聚集体的合成及其增强的锂存储性能

DOI:
10.1016/j.jallcom.2014.08.176
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发表时间:
2015-01
影响因子:
6.2
通讯作者:
Sun Shi-Gang
Sun Shi-Gang
中科院分区:
材料科学2区
文献类型:
--
作者:
Wu Zhen-Guo;Li Jun-Tao;Zhong Yan-Jun;Liu Jie;Guo Xiao-Dong;Huang Ling;Zhong Ben-He;Sun Shi-Gang

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本文报道了一种具有增强电化学性能的分级蠕虫状SnO2@C聚集体的合成策略。具体地说,葡萄糖辅助水热处理中间Co-锡合金纳米颗粒,这些纳米颗粒是通过碳热还原商业SnO2和Co3O4纳米颗粒而形成的。将SnO2@C样品用作锂离子电池的负极时,SnO2@C样品表现出比商业SnO2纳米颗粒和中间Co-Sn2合金纳米颗粒更好的循环性能。在100 mA−1和400 mA−1下,稳定容量分别为533.6和477.0 mA/g−1,循环60次后仍保持稳定容量。当电流密度增加到1600mA·g·−-1时,SnO_2@C样品仍具有384.2 mA·h·g·−·1的高容量。优异的电化学性能可以归因于独特的蠕虫状聚集体结构和碳表面层的协同作用,它们促进了电子的传递,缓冲了大的体积变化。
The present paper reports a synthetic strategy of hierarchical worm-like SnO2@C aggregates with enhanced electrochemical performances. Specifically, a glucose-assisted hydrothermal treatment of the intermediate Co–Sn alloy nanoparticles, which were formed by carbothermal reduction of mixed commercial SnO2and Co3O4nanoparticles. The SnO2@C sample exhibits enhanced cycling performance in comparison with raw commercial SnO2nanoparticles and intermediate Co–Sn alloy nanoparticles when used as anode of lithium ion battery. A stable capacity of 533.6 mA h g−1at 100 mA g−1and 477.0 mA h g−1at 400 mA g−1remains after 60 cycles. When the current density increases to 1600 mA g−1, the SnO2@C sample still deliver a high capacity of 384.2 mA h g−1. The superior electrochemical performances could be attributed to the synergistic effect of unique worm-like aggregates structure and carbon surface-layer, which facilitate the electron transportation and buffer the large volume change.
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