Unravelling the Correlation between the Aspect Ratio of Nanotubular Structures and Their Electrochemical Performance To Achieve High-Rate and Long-Life Lithium-Ion Batteries

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...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2014-12, Vol.53 (49), p.13488-13492
Main Authors: Tang, Yuxin, Zhang, Yanyan, Deng, Jiyang, Qi, Dianpeng, Leow, Wan Ru, Wei, Jiaqi, Yin, Shengyan, Dong, Zhili, Yazami, Rachid, Chen, Zhong, Chen, Xiaodong
Format: Article
Language:English
Subjects:
Aspect ratio
Batteries
Correlation
Devices
Electric Power Supplies
Electrochemical analysis
Electrode materials
Electrodes
Lithium
Lithium - chemistry
Lithium-ion batteries
Nanostructure
Nanotubes
Nanotubes - chemistry
Nanotubes - ultrastructure
TiO2
Titanium - chemistry
Titanium dioxide
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Summary: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. A new aspect: When titanate‐based nanotubes are used to fabricate electrode materials, the aspect ratio of the nanostructures correlates with the electrochemical performance in lithium‐ion batteries. These insights should be useful in the development of efficient energy devices based on nanomaterials.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201406719