期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 49, 页码 13488-13492出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201406719
关键词
aspect ratio; lithium-ion batteries; nanotubes; TiO2
资金
- Singapore National Research Foundation [NRF-RF2009-04]
- Singapore National Research Foundation (CRETAE Programme on Nanomaterials for Energy and Water management)
The fundamental understanding of the relationship between the nanostructure of an electrode and its electrochemical performance is crucial for achieving high-performance lithium-ion batteries (LIBs). In this work, the relationship between the nanotubular aspect ratio and electrochemical performance of LIBs is elucidated for the first time. The stirring hydrothermal method was used to control the aspect ratio of viscous titanate nanotubes, which were used to fabricate additive-free TiO2-based electrode materials. We found that the battery performance at high charging/discharging rates is dramatically boosted when the aspect ratio is increased, due to the optimization of electronic/ionic transport properties within the electrode materials. The proof-of-concept LIBs comprising nanotubes with an aspect ratio of 265 can retain more than 86% of their initial capacity over 6000 cycles at a high rate of 30 C. Such devices with supercapacitor-like rate performance and battery-like capacity herald a new paradigm for energy storage systems.
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