Kim, Ji Young Kim, A-Young Liu, Guicheng Woo, Jae-Young Kim, Hansung Lee, Joong Kee 2024-01-19T23:04:06Z 2024-01-19T23:04:06Z 2021-09-03 2018-03-14 1944-8244 https://pubs.kist.re.kr/handle/201004/121604 An amorphous SiO2 (a-SiO2) thin film was developed as an artificial passivation layer to stabilize Li metal anodes during electrochemical reactions. The thin film was prepared using an electron cyclotron resonance-chemical vapor deposition apparatus. The obtained passivation layer has a hierarchical structure, which is composed of lithium silicide, lithiated silicon oxide, and a-SiO2. The thickness of the a-SiO2 passivation layer could be varied by changing the processing time, whereas that of the lithium silicide and lithiated silicon oxide layers was almost constant. During cycling, the surface of the aSiO(2) passivation layer is converted into lithium silicate (Li4SiO4), and the portion of Li4SiO4 depends on the thickness of a-SiO2. A minimum overpotential of 21.7 mV was observed at the Li metal electrode at a current density of 3 mA cm(-2) with flat voltage profiles, when an a-SiO2 passivation layer of 92.5 run was used. The Li metal with this optimized thin passivation layer also showed the lowest charge-transfer resistance (3.948 Omega cm) and the highest Li ion diffusivity (7.06 x 10(-14) cm(2) s(-1)) after cycling in a Li-S battery. The existence of the Li4SiO4 artificial passivation layer prevents the corrosion of Li metal by suppressing Li dendritic growth and improving the ionic conductivity, which contribute to the low change-transfer resistance and high Li ion diffusivity of the electrode. English American Chemical Society LITHIUM DEPOSITION LAYER ELECTRODES PROTECTION ENTHALPY Li4SiO4-Based Artificial Passivation Thin Film for Improving Interfacial Stability of Li Metal Anodes Article 10.1021/acsami.7b18997 1 ACS Applied Materials & Interfaces, v.10, no.10, pp.8692 - 8701 ACS Applied Materials & Interfaces 10 10 8692 8701 scie scopus 000427910800034 2-s2.0-85043779945 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article LITHIUM DEPOSITION LAYER ELECTRODES PROTECTION ENTHALPY Li metal Li dendrite suppression SiO2 thin film Li4SiO4 passivation layer electron cyclotron resonance-chemical vapor deposition