Preparation of LiNiO2 and LiM
y
Ni1-
y
O2 (M=Co,Al) films by electrostatic spray deposition |
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| Authors: | Kohta Yamada Nobuaki Sato Takeo Fujino Choong G Lee Isama Uchida Jan R Selman |
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| Institution: | (1) Institute for Advanced Materials Processing, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan e-mail: yamada@ibis.iamp.tohoku.ac.jp Tel./Fax: +81-22-2175164, JP;(2) Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan, JP;(3) Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA, US |
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| Abstract: | Syntheses of LiNiO2, LiCo0.5Ni0.5O2, and LiAl0.25Ni0.75O2 as thin films were carried out by electrostatic spray deposition (ESD) onto a gold substrate. Single-phase LiNiO2 film was obtained using a precursor solution of Li(OCOCH3)+Ni(OCOCH3)2/ethanol, and by heating the deposit at 700?°C under an oxygen stream. In the case of cobalt or aluminum doping, Co(NO3)2/ethanol or Al(NO3)3/ethanol were added to the precursor solution in a given ratio. X-ray diffractometry revealed that all films had a crystal structure of space group R3¯m; a=2.879, c=14.197?Å for LiNiO2; a=2.844, c=14.152?Å for LiCo0.5Ni0.5O2; a=2.855, c=14.148?Å for LiAl0.25Ni0.75O2 (in hexagonal setting). Although these products were highly porous, it was observed that the average film thickness of LiNiO2 increased almost proportionally with the deposition time. Electrochemical measurements (cyclic voltammetry, charge/discharge measurement at a constant current) were carried out in organic solutions of LiClO4 (1?mol dm?3 LiClO4/propylene carbonate+ethylene carbonate). The results indicated that thin films fabricated by ESD were electrochemically active for lithium ion extraction/insertion. The effect of cobalt or aluminum doping on the voltammograms is also described. |
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| Keywords: | Electrostatic spray deposition Thin film Lithium nickel dioxide cathode Lithium ion secondary battery |
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