期刊
JOURNAL OF POWER SOURCES
卷 314, 期 -, 页码 18-27出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.02.084
关键词
Lithium titanate; Carbon coating; Hierarchical; Rate capability; Lithium-ion battery
资金
- Key Projects in Nature Science Foundation of Jiangsu Province [BK2011030]
- Major Project of Educational Commission of Jiangsu Province of China [13KJA430004]
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
In this work, carbon-coated hierarchical acanthosphere-like Li4Ti5O12 microspheres (denoted as AM-LTO) were prepared via a two-step hydrothermal process with low-cost glucose as the organic carbon source. The hierarchical porous microspheres had open structures with diameters of 4-6 mu m, which consisted of a bunch of willow leaf-like nanosheets. Each nanosheet was comprised of Li4Ti5O12 nanoparticles that are 20 nm in size and coated by a thin carbon layer. When applied as the anode material for lithium-ion batteries (LIBs), the AM-LTO presented outstanding rate and cycling performance due to its unique morphologies. A high capacity of 145.6 mAh g(-1) was achieved for AM-LTO at a rate of 40C (1C = 175 mAh g(-1)). In contrast, the sample synthesized without glucose as carbon source (denoted as S-LTO) experienced an obvious structural collapse during the hydrothermal reaction and presented a specific capacity of only 67 mAh g(-1) at 1C, which further decreased to 14 mAh g(-1) at 40C. Further morphological growth of the acanthosphere-like Li4Ti5O12 microspheres and their excellent performance as an anode in LIBs were also discussed in this work. (C) 2016 Elsevier B.V. All rights reserved.
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