Electrochemical performance of nano-SiO2 modified LiCoO2 thin films fabricated by electrostatic spray deposition (ESD)

• Published in: Electrochimica acta Vol. 51; no. 16; pp. 3292 - 3296
• Main Authors: YU, Y, SHUI, J. L, JIN, Y, CHEN, C. H
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 10.04.2006
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Cobalt oxide; Ternary compound; Alkali metal Compounds; Transition metal Compounds; Electrostatic spray deposition; Secondary cell; Electrode material; Electric batteries; Spray coating; Discharge charge cycle; Thin film; Intercalation compound; Lithium battery; Metal metal oxide batteries; Organic electrolyte storage battery; Silicon oxides; Thin layer electrode; Silicon oxide; Lithium oxide; Lithium cobalt oxide; Specific capacity; Electrical characteristic; Modified material
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2005.09.021

With a mixture of a SiO2 so] and a solution of lithium and cobalt acetates as the precursor, nano-SiO2 modified LiCo02 films were fabricated by the electrostatic spray deposition (ESD) technique. The SiO2 content of these films was 0, 5, 10, 15 and 20 wt%, respectively. Their structure and electrochemical properties were characterized by means of X-ray diffraction, scanning electron microscopy, galvanostatic cell cycling, AC impedance spectroscopy and cyclic voltammetry. Li2CoSiO4 was found formed in the SiO2-containing films. The film with 15 wt% SiO2 shows the best cycling stability with the capacity of 130 mAh/g in the voltage range between 2.7 and 4.3 V at the current density of 0.1 mA/cm2. Due to its resulted small cell impedance, it has excellent rate capability. A LiCoO2 (shell)/SiO2 (core) structure model is proposed to explain the improved properties of these films.