Highly-Stable Li4Ti5O12 Anodes Obtained by Atomic-Layer-Deposited Al2O3
| Autor: | Hyung Sang Park, Hyung Cheoul Shim, Tae-Ho Yoon, Seunghoon Nam, Kunwoo Park, Jae Kook Yoon, Seungmin Hyun |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Battery (electricity)
Materials science Gas evolution reaction chemistry.chemical_element 02 engineering and technology Electrolyte Li4Ti5O12 atomic-layer-deposited Al2O3 gas evolution 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode Atomic layer deposition Chemical engineering X-ray photoelectron spectroscopy chemistry Electrode General Materials Science Lithium 0210 nano-technology |
| Zdroj: | Materials; Volume 11; Issue 5; Pages: 803 |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma11050803 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |