Highly-Stable Li4Ti5O12 Anodes Obtained by Atomic-Layer-Deposited Al2O3
AbstractLTO (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
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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.
Yoon JK, Nam S, Shim HC, Park K, Yoon T, Park HS, Hyun S. Highly-Stable Li4Ti5O12 Anodes Obtained by Atomic-Layer-Deposited Al2O3. Materials. 2018; 11(5):803.Chicago/Turabian Style
Yoon, Jae K.; Nam, Seunghoon; Shim, Hyung C.; Park, Kunwoo; Yoon, Taeho; Park, Hyung S.; Hyun, Seungmin. 2018. "Highly-Stable Li4Ti5O12 Anodes Obtained by Atomic-Layer-Deposited Al2O3." Materials 11, no. 5: 803.
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