Fabrication of One-Dimensional Sb@TiO2 Composites as Anode Materials for Lithium-Ion Batteries
Fabrication of One-Dimensional Sb@TiO2 Composites as Anode Materials for Lithium-Ion Batteries
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一维 Sb@TiO2 复合材料作为锂离子电池负极材料的制备
DOI：
10.1149/2.0881613jes
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发表时间：
2016-09
影响因子：
3.9
通讯作者：
Limin Wang
中科院分区：
文献类型：
--
作者：
Zheng Yi;Qigang Han;Shanshan Ju;Yaoming Wu;Yong Cheng;Limin Wang
采用包覆-还原法制备了一维Sb@ TiO 2复合材料，在该复合材料中，许多亚微米级的Sb核嵌入到一维连续的TiO 2壳层中，每个核层与壳层之间存在大量的自由空间。当作为锂离子电池（LIB）的有前途的负极材料进行评估时，所制备的Sb@ TiO 2复合物表现出752.2 mAh g− 1的初始放电容量和在100 mA g− 1（0.15 C）的电流密度下100次重复循环后450.2 mAh g− 1的可逆容量。即使在2000 mA g− 1（3C）的高电流密度下，也实现了340.2 mAh g− 1的放电容量。Sb@TiO2复合材料良好的循环稳定性和倍率性能是由于不连续的Sb核和连续的TiO 2壳之间的协同作用，以及它们之间的额外自由空间具有良好的缓冲作用，可以减缓Sb在嵌/脱锂过程中的体积变化。
In this work, a coating-reduction route was used to fabricate a one-dimensional (1D) Sb@ TiO 2 composite in which many discontinuous submicron-sized Sb cores were embedded into the 1D uninterrupted TiO 2 shells, accompanied by significant free space between each core and the shell. When evaluated as a promising anode material for lithium-ion batteries (LIBs), this as-prepared Sb@ TiO 2 composite exhibited an initial discharge capacity of 752.2 mAh g− 1 and a reversible capacity of 450.2 mAh g− 1 after 100 repeated cycles at a current density of 100 mA g− 1 (0.15 C). Even at a high current density of 2000 mA g− 1 (3C), a discharge capacity of 340.2 mAh g− 1 was achieved. The good cycling stability and rate capability of the obtained Sb@ TiO 2 composite can be attributed to the synergistic effects between the discontinuous Sb cores and the uninterrupted TiO 2 shells, as well as the extra free space between them with good buffering effects to retard the volume changes of Sb during the lithium insertion/extraction.
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