Electrochemical properties of an as-deposited LiFePO4 thin film electrode prepared by aerosol deposition

• Published in: Journal of power sources Vol. 244; pp. 646 - 651
• Main Authors: Kim, Icpyo, Park, Jinsoo, Nam, Tae-Hyun, Kim, Ki-Won, Ahn, Jou-Hyeon, Park, Dong-Soo, Ahn, Cheolwoo, Wang, Guoxiu, Ahn, Hyo-Jun
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2013; Elsevier
• Subjects: Aerosol deposition; All-solid-state battery; Applied sciences; Battery; 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; Lithium iron phosphate; Thin film; All-solid-state battery; Lithium iron phosphate; Aerosol deposition; Battery; Thin film; Iron phosphate; Electrode production; Iron Phosphates; Secondary cell; Solid state; Electrochemical properties; Quaternary compound; Lithium phosphate; Thin layer electrode; Lithium Phosphates
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.12.108

Prepared by the deposition of a solid electrode and electrolyte, all-solid-state batteries are a promising next generation battery system. Aerosol deposition (AD) offers many advantages compared to the conventional thin film deposition methods, including the deposition of a crystallized thin film with no heat treatment and a fast deposition rate. In this study, a LiFePO4/C composite thin film is directly fabricated using a LiFePO4/C composite raw powder. SEM and EDS results show the successful deposition of a LiFePO4/C composite thin film on a stainless steel substrate and X-ray diffraction patterns reveal that the as-deposited thin film has a crystalline structure, corresponding to the olivine phase, without any heat treatment. In a CV test, oxidation and reduction peaks appear at 3.51 and 3.36 V, corresponding closely to the peaks of bulk olivine LiFePO4. Furthermore, the profiles of the charge and discharge curves are similar to those of the bulk electrode and the discharge capacity is 31.1 μAh cm−2 μm−1 in the first cycle. After 20 cycles of 10.65 and 106.5 μA cm−2 μm−1, the capacity is recovered to 30.7 μAh cm−2 μm−1. Aerosol deposition can potentially be used in the fabrication of all-solid-state batteries. ► A LiFePO4 thin film electrode was fabricated by aerosol deposition without heat treatment. ► The thin film electrode showed similar electrochemical properties as bulk one. ► The aerosol deposition is much faster and easier than conventional deposition methods.