State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , 122 Luoshi Road, 430070, Wuhan, Hubei, China.
Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States.
ACS Appl Mater Interfaces. 2017 Mar 29;9(12):10652-10663. doi: 10.1021/acsami.6b16498. Epub 2017 Mar 15.
TiO is a promising and safe anode material for lithium ion batteries (LIBs). However, its practical application has been plagued by its poor rate capability and cycling properties. Herein, we successfully demonstrate a novel structured TiO anode with excellent rate capability and ultralong cycle life. The TiO material reported here shows a walnut-like porous core/shell structure with hybridized anatase/amorphous phases. The effective synergy of the unique walnut-like porous core/shell structure, the phase hybridization with nanoscale coherent heterointerfaces, and the presence of minor carbon species endows the TiO material with superior lithium storage properties in terms of high capacity (∼177 mA h g at 1 C, 1 C = 170 mA g), good rate capability (62 mA h g at 100 C), and excellent cycling stability (∼83 mA h g was retained over 10 000 cycles at 10 C with a capacity decay of 0.002% per cycle).
TiO 是一种很有前途且安全的锂离子电池（LIB）阳极材料。然而，其实际应用受到其较差的倍率性能和循环性能的困扰。在此，我们成功地展示了一种具有优异倍率性能和超长循环寿命的新型结构化 TiO 阳极。本文报道的 TiO 材料呈现出具有混合锐钛矿/无定形相的核桃状多孔核/壳结构。独特的核桃状多孔核/壳结构、纳米级相干异质界面的相杂交以及少量碳物种的存在的有效协同作用，使得 TiO 材料具有优异的储锂性能，表现为高容量（在 1 C 时约为 177 mA h g-1，1 C = 170 mA g-1）、良好的倍率性能（在 100 C 时为 62 mA h g-1）和优异的循环稳定性（在 10 C 下经过 10 000 次循环后仍保留约 83 mA h g-1，每个循环的容量衰减为 0.002%）。
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