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Materials 2018, 11(5), 803; https://doi.org/10.3390/ma11050803

Highly-Stable Li4Ti5O12 Anodes Obtained by Atomic-Layer-Deposited Al2O3

1
Nano Mechanical Systems Research Division, Department of Nano Mechanics, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Korea
2
ISAC Research Inc., Daejeon 34036, Korea
3
Department of Nanomechatronics, University of Science and Technology (UST), Daejeon 34113, Korea
*
Author to whom correspondence should be addressed.
Received: 18 April 2018 / Revised: 9 May 2018 / Accepted: 14 May 2018 / Published: 16 May 2018
(This article belongs to the Section Energy Materials)
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Abstract

LTO (Li4Ti5O12) has been highlighted as anode material for next-generation lithium ion secondary batteries due to advantages such as a high rate capability, excellent cyclic performance, and safety. However, the generation of gases from undesired reactions between the electrode surface and the electrolyte has restricted the application of LTO as a negative electrode in Li-ion batteries in electric vehicles (EVs) and energy storage systems (ESS). As the generation of gases from LTO tends to be accelerated at high temperatures (40–60 °C), the thermal stability of LTO should be maintained during battery discharge, especially in EVs. To overcome these technical limitations, a thin layer of Al2O3 (~2 nm thickness) was deposited on the LTO electrode surface by atomic layer deposition (ALD), and an electrochemical charge-discharge cycle test was performed at 60 °C. The capacity retention after 500 cycles clearly shows that Al2O3-coated LTO outperforms the uncoated one, with a discharge capacity retention of ~98%. TEM and XPS analyses indicate that the surface reactions of Al2O3-coated LTO are suppressed, while uncoated LTO undergoes the (111) to (222) phase transformation, as previously reported in the literature. View Full-Text
Keywords: Li4Ti5O12; atomic-layer-deposited Al2O3; gas evolution Li4Ti5O12; atomic-layer-deposited Al2O3; gas evolution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yoon, J.K.; Nam, S.; Shim, H.C.; Park, K.; Yoon, T.; Park, H.S.; Hyun, S. Highly-Stable Li4Ti5O12 Anodes Obtained by Atomic-Layer-Deposited Al2O3. Materials 2018, 11, 803.

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