Li4Ti5O12-TiO2 composite anode material for lithium-ion batteries
Li4Ti5O12-TiO2 composite anode material for lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2012.08.082
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发表时间：
2013-01-15
影响因子：
9.2
通讯作者：
Xia, Qing
中科院分区：
文献类型：
--
作者：
Wang, Jie;Zhao, Hailei;Xia, Qing
为了提高Li 4 Ti 5 O 12正极材料的倍率性能，采用溶剂热法原位合成了双相复合材料Li 4 Ti 5 O 12-TiO 2。与单相Li 4 Ti 5 O 12相比，Li 4 Ti 5 O 12-TiO 2复合材料显示出更高的可逆容量和更好的倍率性能。由于空间位阻效应，TiO 2可以显著减小Li 4 Ti 5 O 12-TiO 2粉末的粒径，从而缩短锂离子的扩散距离并增强电极反应。同时，Li 4 Ti 5 O 12-TiO 2电极中的TiO 2也能为Li 4 Ti 5 O 12-TiO 2电极提供一定的容量。用碳（类似于2.5重量%）涂覆Li 4 Ti 5 O 12-TiO 2复合材料可进一步提高Li_4 Ti_5 O_（12）-TiO_2电极的倍率性能，在5 ℃下循环100次后，其可逆容量仍保持在140 mA·h·g ~（-1）左右。0 2012 Elsevier BV保留所有权利。
In an effort to improve the rate-capability of Li4Ti5O12 anode material, a dual-phase composite Li4Ti5O12 -TiO2 is in situ prepared via a solvothermal route. The Li4Ti5O12-TiO2 composite shows higher reversible capacity and better rate-capability compared to single phase Li4Ti5O12. The TiO2 can decrease significantly the particle size of Li4Ti5O12-TiO2 powders due to a steric hindrance effect, which thereby shortens the lithium ion diffusion distance and enhances the electrode reaction. Meanwhile, anatase TiO2 can contribute some capacity to the Li4Ti5O12-TiO2 electrode. Coating the Li4Ti5O12-TiO2 composite with carbon (similar to 2.5 wt.%) can further improve the rate-capability of Li4Ti5O12-TiO2 electrode, a reversible capacity of similar to 140 mA h g(-1) is maintained after 100 cycles at 5 C. 0 2012 Elsevier B.V. All rights reserved.