Co3O4-C core-shell nanowire array as an advanced anode material for lithium ion batteries
Co3O4-C core-shell nanowire array as an advanced anode material for lithium ion batteries
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DOI：
10.1039/c2jm31629c
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Gu, Chang-dong
中科院分区：
文献类型：
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作者：
Chen, Jiao;Xia, Xin-hui;Gu, Chang-dong
本文报道了Co3O4-C核壳纳米线阵列的合成及其作为锂离子电池负极材料的应用。采用表面水热合成和直流磁控溅射相结合的方法制备了核壳纳米线阵列。将厚度为18 nm的非晶碳层均匀地涂覆在多孔Co3O4纳米线表面。Co3O4-C核壳纳米线阵列在0.5℃下的初始放电容量为1330.8 mA h g(-1)，在50次循环后保持989.0 mA h g（-1）的高可逆容量，远高于未经修饰的Co3O4纳米线阵列（490.5 mA h g(-1)）。电化学性能的提高可归因于引入了薄碳层，这提高了Co3O4纳米线阵列的导电性和结构稳定性。
We report on the synthesis of a Co3O4-C core-shell nanowire array and its application as an anode material for lithium ion batteries. The core-shell nanowire array is prepared by combining a facial hydrothermal synthesis and direct current magnetron sputtering. The amorphous carbon layer with a thickness of 18 nm is homogeneously coated on the surface of the porous Co3O4 nanowire. The Co3O4-C core-shell nanowire array delivers an initial discharge capacity of 1330.8 mA h g(-1) at 0.5 C and maintains a high reversible capacity of 989.0 mA h g(-1) after 50 cycles, much higher than the unmodified Co3O4 nanowire array (490.5 mA h g(-1)). The improved electrochemical performance can be attributed to the introduction of a thin carbon layer, which improves the electrical conductivity and structure stability of the Co3O4 nanowire array.