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Issue 20, 2015
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Enhanced electrochemical capabilities of lithium ion batteries by structurally ideal AAO separator

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Abstract

In this study, a novel inorganic separator, porous anodic aluminum oxide (AAO), is introduced for a rechargeable lithium ion battery system. The highly ordered AAO gives rise to an ideal structure for battery separators with appropriate porosity (67.4 %), extremely low tortuosity, and thermal durability. The prepared AAO separator has average pore sizes of 75 nm and thickness of 54 μm, which leads to enhanced ionic conductivity (2.196 mS cm−1), discharging capacity at high current rates (20.13 mA h g−1 at 10 C), and capacity retention (82.9%). Moreover, a computer simulation (COMSOL) model shows that the ideal AAO separator structure induces stable lithium ion battery operation in wide ranges of current rate, due to effective suppression of Li dendrite formation. The AAO separator has a strong potential in massive energy storage systems and electric vehicles.

Graphical abstract: Enhanced electrochemical capabilities of lithium ion batteries by structurally ideal AAO separator

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Supplementary files

Article information


Submitted
15 Mar 2015
Accepted
13 Apr 2015
First published
13 Apr 2015

J. Mater. Chem. A, 2015,3, 10715-10719
Article type
Communication
Author version available

Enhanced electrochemical capabilities of lithium ion batteries by structurally ideal AAO separator

Y. Ahn, J. Park, D. Shin, S. Cho, S. Y. Park, H. Kim, Y. Piao, J. Yoo and Y. S. Kim, J. Mater. Chem. A, 2015, 3, 10715
DOI: 10.1039/C5TA01892G

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